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1

Wednesday, September 29th 2004, 3:58pm

E.7. Sloops and Escorts

Note on Nomenclature:

Traditional naval terms such as corvette and sloop don't fit neatly with the functions of escort vessels as described here. India has therefore adapted a couple of indigenous terms to describe some vessels.

There are four ship types:

-Launch (PL): A very small, coastal vessel intended primarily as an ASW and rescue vessel. Not restricted by treaty.

-Charavaahaa (PC): From the word for "shepherd". An escort with AAW and ASW weaponry. Technically ocean-going, but the capability of units may be limited by range or size. Combination of traditional WW2 frigates and corvettes. Not restricted by treaty

-Paritraataa (PP): From the word for "protector". A general purpose escort with ASuW capability (torpedoes) in addition to AAW and ASW weaponry. Essentially a "destroyer escort", and the torpedoes make them restricted by treaty. They count against Indian CDS tonnage.

-Frigate: A general purpose escort trading some firepower for scouting ability, in the form of an aircraft. The inclusion of torpedoes makes them restricted by treaty, so they count against Indian CDS tonnage.

-Survey Ship: A derivative of the frigate design, trading firepower for technical workspace.

Classes

S-101 Charavaahaa (3 units) - 1921-2

S-107 Charavaahaa (0 units) - 1923

A-1 ASW Launch (44 units) - 1926-9

S-114 Paritraataa (0 units) - 1927

S-120 Charavaahaa (10 units) - 1929-31

Nanda Devi Frigate (4 units) - 1929-30

Kudligi Paritraataa (4 units) - 1931

Sri Pada Frigate (2 unit) - 1932

S Charavaahaa (0 units) - 1914/1931

Kantabanji Paritraataa (4 units) - 1932

Shimla Paritraataa (6 units) - 1934-6

Salem Paritraataa (6 units) - 1935

A-45 ASW Launch (5 units) - 1934

Vidisha Paritraataa (6 units) - 1938

Thrissur Paritraataa (2 units) - 1943

Ambala (12 units) - 1945/6



Note: Names assigned to S-101, S-107, S-114, S-120, P-1 classes in 1929.

2

Monday, November 8th 2004, 4:01pm

[SIZE=3]S-101 Class Charavaahaa[/SIZE]



Batticola, S-101, laid down 1921, to Persia 1939
Anuradhapura, S-102, laid down 1921, to Persia 1939
Galle, S-103, laid down 1922, to Persia 1939
Cuddalore, S-104, laid down 1922
Proddatur, S-105, laid down 1922
Warangel, laid down 1922

S-101, laid down 1921

Length, 76.2 m x Beam, 10.1 m x Depth, 2.7 m
1061 tonnes normal displacement (925 tonnes standard)

Main battery: 3 x 10.5-cm
Secondary battery: 4 x 3.5-cm
AA battery: 2 x 1.5-cm

Weight of broadside: 51 kg

Main belt, 5.0 cm; ends unarmored
Armor deck, average 2.0 cm
Conning tower, 5.0 cm

Battery armor:
Main, 5.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 4997 shaft kw = 21.81 knots
Approximate cruising radius, 6000 nm / 12 knots

Typical complement: 93-121


Estimated cost, $766,000 (£192,000)

Remarks:

Relative extent of belt armor, 87 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 14 tonnes = 1 pct
Armor, total ..................... 169 tonnes = 16 pct

Belt 81 tonnes = 8 pct
Deck 76 tonnes = 7 pct
C.T. 4 tonnes = 0 pct
Armament 8 tonnes = 1 pct

Machinery ........................ 231 tonnes = 22 pct
Hull and fittings; equipment ..... 430 tonnes = 41 pct
Fuel, ammunition, stores ......... 167 tonnes = 16 pct
Miscellaneous weights ............ 50 tonnes = 5 pct
-----
1061 tonnes = 100 pct

Estimated metacentric height, 0.4 m

Displacement summary:

Light ship: 894 tonnes
Standard displacement: 925 tonnes
Normal service: 1061 tonnes
Full load: 1165 tonnes

Loading submergence 486 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.20

Shellfire needed to sink: 865 kg = 53.9 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.8
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 71 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.12

Relative quality as a seaboat: 1.41

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.36
Hull speed coefficient 'M' = 7.49
'Natural speed' for length = 15.8 knots
Power going to wave formation
at top speed: 60 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 86 percent

Relative accommodation and working space: 139 percent


Displacement factor: 134 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.92
(Structure weight per square
metre of hull surface: 240 kg)

Relative longitudinal hull strength: 2.62
(for 4.00 m average freeboard;
freeboard adjustment +1.05 m)

Relative composite hull strength: 1.02

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

250.00 x 33.00 x 9.00; 13.12 -- Dimensions
0.50 -- Block coefficient
1921 -- Year laid down
21.81 / 6000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
3 x 4.13; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
4 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
2 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
1.97 / 0.00 / 0.00 / 0.00; 87 -- Belt armor; relative extent
0.79 / 1.97 -- Deck / CT
1.97 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

3

Monday, November 8th 2004, 4:05pm

[SIZE=3]S-107 Class Charavaahaa[/SIZE]

S-107, laid down 1923, sunk 1924
Nagercoil, S-108, laid down 1923, sold 1941
S-109, laid down 1923, total constructive loss 1924, expended as target 1924
Tuticorin, S-110, laid down 1923, sold 1941

S-107, laid down 1923

Length, 48.8 m x Beam, 8.5 m x Depth, 2.6 m
544 tonnes normal displacement (462 tonnes standard)

Main battery: 2 x 10.5-cm
Secondary battery: 2 x 3.5-cm
AA battery: 2 x 1.5-cm

Weight of broadside: 33 kg

Main belt, 2.5 cm; ends unarmored
Armor deck, average 1.5 cm
Conning tower, 5.0 cm

Battery armor:
Main, 5.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 2997 shaft kw = 19.94 knots
Approximate cruising radius, 5000 nm / 12 knots

Typical complement: 56-73


Estimated cost, $490,000 (£122,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 9 tonnes = 2 pct
Armor, total ..................... 67 tonnes = 12 pct

Belt 29 tonnes = 5 pct
Deck 31 tonnes = 6 pct
C.T. 3 tonnes = 1 pct
Armament 5 tonnes = 1 pct

Machinery ........................ 134 tonnes = 25 pct
Hull and fittings; equipment ..... 209 tonnes = 38 pct
Fuel, ammunition, stores ......... 99 tonnes = 18 pct
Miscellaneous weights ............ 25 tonnes = 5 pct
-----
544 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 445 tonnes
Standard displacement: 462 tonnes
Normal service: 544 tonnes
Full load: 608 tonnes

Loading submergence 264 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.07

Shellfire needed to sink: 363 kg = 22.6 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.5
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 73 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.18

Relative quality as a seaboat: 1.15

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 5.99
'Natural speed' for length = 12.6 knots
Power going to wave formation
at top speed: 71 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 98 percent

Relative accommodation and working space: 116 percent


Displacement factor: 125 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.85
(Structure weight per square
metre of hull surface: 204 kg)

Relative longitudinal hull strength: 5.21
(for 3.70 m average freeboard;
freeboard adjustment +1.12 m)

Relative composite hull strength: 1.02

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

160.00 x 28.00 x 8.50; 12.14 -- Dimensions
0.50 -- Block coefficient
1923 -- Year laid down
19.94 / 5000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
25 tons -- Miscellaneous weights
++++++++++
2 x 4.13; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
2 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.98 / 0.00 / 0.00 / 0.00; 100 -- Belt armor; relative extent
0.59 / 1.97 -- Deck / CT
1.97 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

4

Friday, March 11th 2005, 5:30pm

[SIZE=3]A-1 Class ASW Launch[/SIZE]

Ten units (A-1 to A-10), built 1926
Twelve units (A-11 to A-22), built 1927
Ten units (A-23 to A-32), built 1928
Twelve units (A-33 to A-44) projected for 1929

A-1 ASW Launch, laid down 1926

Length, 40.0 m x Beam, 5.8 m x Depth, 2.0 m
220 tonnes normal displacement (201 tonnes standard)

Main battery: 1 x 10.5-cm
Secondary battery: 1 x 3.5-cm
AA battery: 2 x 1.5-cm

Weight of broadside: 17 kg

Hull unarmored

Battery armor:
Main, 5.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 1800 shaft kw = 19.95 knots
Approximate cruising radius, 2000 nm / 12 knots

Typical complement: 29-37


Estimated cost, $296,000 (£74,000)

Remarks:

Magazines and engineering spaces are cramped, with poor
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tonnes = 2 pct
Armor, total ..................... 2 tonnes = 1 pct

Armament 2 tonnes = 1 pct

Machinery ........................ 77 tonnes = 35 pct
Hull and fittings; equipment ..... 93 tonnes = 42 pct
Fuel, ammunition, stores ......... 27 tonnes = 12 pct
Miscellaneous weights ............ 16 tonnes = 7 pct
-----
220 tonnes = 100 pct

Estimated metacentric height, 0.1 m

Displacement summary:

Light ship: 193 tonnes
Standard displacement: 201 tonnes
Normal service: 220 tonnes
Full load: 234 tonnes

Loading submergence 141 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.07

Shellfire needed to sink: 78 kg = 4.9 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.2
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 54 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.26

Relative quality as a seaboat: 1.09

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.47
Sharpness coefficient: 0.36
Hull speed coefficient 'M' = 6.64
'Natural speed' for length = 11.5 knots
Power going to wave formation
at top speed: 72 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 138 percent

Relative accommodation and working space: 96 percent


Displacement factor: 105 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.84
(Structure weight per square
metre of hull surface: 154 kg)

Relative longitudinal hull strength: 5.04
(for 2.90 m average freeboard;
freeboard adjustment +0.75 m)

Relative composite hull strength: 1.00

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

131.20 x 19.02 x 6.56; 9.51 -- Dimensions
0.47 -- Block coefficient
1926 -- Year laid down
19.95 / 2000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
16 tons -- Miscellaneous weights
++++++++++
1 x 4.13; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
1 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
2 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.97 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

5

Friday, March 11th 2005, 5:31pm

[SIZE=3]S-114 Class Paratraataa[/SIZE]

(Note: Specs revised 30/8/05)

The G-113 class of destroyers were scheduled for replacement during 1927-1929. Originally they were to be scrapped, but on further review it was determined that a rebuild into long-range escorts would be both feasible and economic.

The old 8.8 cm guns were landed, with a third 10.5 cm gun replacing one of them. Miscellaneous weight was increased to add depth charge capacity, and the four small torpedo tubes were swapped for three larger tubes in a single carriage. A smaller but much newer powerplant was installed, and the range was increased to 12,000 nautical miles. The continued presence of torpedoes does require that these ships be restricted by the Cleito Treaty, and for this purpose, they can be classified as Coastal Defence Ships, rather than destroyers.

Note that while the class was designated the G-113 class while in service as destroyers, the lead unit was lost in the Andaman War of 1916/7. Hence, after the conversion, the class is re-named for the oldest survivor, S-114.

Pudukkottai, S-114 (ex-G-114), rebuilt 1927, scrapped 1941
Gadag, S-115 (ex-G-115), rebuilt 1927, scrapped 1941
Udupi, S-116 (ex-G-116), rebuilt 1928, scrapped 1941
Kasaragod, S-117 (ex-G-117), rebuilt 1928, scrapped 1941
Wanparti, S-118 (ex-G-118), rebuilt 1928, scrapped 1941
Adoni, S-119 (ex-G-119), rebuilt 1928, scrapped 1941


S-114, laid down 1927

Length, 96.0 m x Beam, 9.1 m x Depth, 2.7 m
1094 tonnes normal displacement (835 tonnes standard)

Main battery: 3 x 10.5-cm
Secondary battery: 4 x 3.5-cm
AA battery: 4 x 1.5-cm

Weight of broadside: 51 kg

3 TT, 55.0 cm

Hull unarmored
Conning tower, 5.0 cm

Battery armor:
Main, 3.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 5996 shaft kw = 23.68 knots
Approximate cruising radius, 12000 nm / 12 knots

Typical complement: 95-124


Estimated cost, $1.096 million (£274,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 14 tonnes = 1 pct
Armor, total ..................... 10 tonnes = 1 pct

C.T. 4 tonnes = 0 pct
Armament 6 tonnes = 1 pct

Machinery ........................ 254 tonnes = 23 pct
Hull and fittings; equipment ..... 506 tonnes = 46 pct
Fuel, ammunition, stores ......... 290 tonnes = 26 pct
Miscellaneous weights ............ 20 tonnes = 2 pct
-----
1094 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 804 tonnes
Standard displacement: 835 tonnes
Normal service: 1094 tonnes
Full load: 1296 tonnes

Loading submergence 519 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.19

Shellfire needed to sink: 909 kg = 56.6 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.8
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 100 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.22

Relative quality as a seaboat: 2.00

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 9.34
'Natural speed' for length = 17.7 knots
Power going to wave formation
at top speed: 52 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 88 percent

Relative accommodation and working space: 114 percent


Displacement factor: 168 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.96
(Structure weight per square
metre of hull surface: 241 kg)

Relative longitudinal hull strength: 1.95
(for 4.10 m average freeboard;
freeboard adjustment +1.13 m)

Relative composite hull strength: 1.03

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

315.00 x 30.00 x 9.00; 13.45 -- Dimensions
0.45 -- Block coefficient
1927 -- Year laid down
23.68 / 12000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
20 tons -- Miscellaneous weights
++++++++++
3 x 4.13; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
4 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
3 / 0 / 21.65 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 1.97 -- Deck / CT
1.18 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

6

Friday, September 30th 2005, 2:35pm

[SIZE=3]S-120 Class Charavaahaa[/SIZE]

A marriage of the sloop and the coastal minesweeper, types identified as priorities in the defence of India's coastal waters and shipping. The vessel is small and can be produced relatively quickly. The armament is deemed acceptable for dealing with submarines, pirates, and light torpedo craft, the most likely threats to Indian shipping directly offshore.

A run of ten are anticipated between 1929 and 1931.



Rabkavi, S-120, laid down 1929
Phaltan, S-121, laid down 1929
Proddatur, S-124, laid down 1930
Ichalkaranji, S-125, laid down 1930
Ratnagiri, S-127, laid down 1930
Malegaon, S-129, laid down 1930
Umred, S-130, laid down 1931
Akola, S-133, to be laid down 1931
Korba, S-134, to be laid down 1931
Belgaum, S-137, to be laid down 1931

Length, 52.0 m x Beam, 8.0 m x Depth, 2.7 m
566 tonnes normal displacement (475 tonnes standard)

Main battery: 1 x 10.5-cm
Secondary battery: 2 x 3.5-cm (1 x 2)
AA battery: 4 x 1.5-cm (1 x 4)

Weight of broadside: 17 kg

Miscellaneous Weight:
-20 t: depth charges
-30 t: minesweeping gear

Hull unarmored
Conning tower, 5.0 cm

Battery armor:
Main, 3.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 3999 shaft kw = 21.50 knots
Approximate cruising radius, 6000 nm / 12 knots

Typical complement: 58-75


Estimated cost, $717,000 (£179,000)

Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tonnes = 1 pct
Armor, total ..................... 5 tonnes = 1 pct

C.T. 3 tonnes = 1 pct
Armament 2 tonnes = 0 pct

Machinery ........................ 162 tonnes = 29 pct
Hull and fittings; equipment ..... 238 tonnes = 42 pct
Fuel, ammunition, stores ......... 106 tonnes = 19 pct
Miscellaneous weights ............ 50 tonnes = 9 pct
-----
566 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 460 tonnes
Standard displacement: 475 tonnes
Normal service: 566 tonnes
Full load: 637 tonnes

Loading submergence 264 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.10

Shellfire needed to sink: 312 kg = 19.4 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.4
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 58 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.10

Relative quality as a seaboat: 1.15

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.38
Hull speed coefficient 'M' = 6.30
'Natural speed' for length = 13.1 knots
Power going to wave formation
at top speed: 71 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 109 percent

Relative accommodation and working space: 115 percent


Displacement factor: 135 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.97
(Structure weight per square
metre of hull surface: 220 kg)

Relative longitudinal hull strength: 5.47
(for 3.80 m average freeboard;
freeboard adjustment +1.20 m)

Relative composite hull strength: 1.16

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

170.56 x 26.24 x 8.86; 12.46 -- Dimensions
0.50 -- Block coefficient
1930 -- Year laid down
21.50 / 6000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
1 x 4.13; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 1.97 -- Deck / CT
1.18 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

7

Friday, September 30th 2005, 2:41pm

[SIZE=3]Nanda Devi Class Frigate[/SIZE]

General-purpose ships designed to patrol the more distal parts of India's sea lines of communications. For this purpose, they have a large operating radius.

A catapult and crane are fitted for one seaplane. A telescoping canvas hanger, fitted on rails, is located immediately forward of the catapult and rolls aft to contain the aircraft in the illustrated location. This provides some shelter to the aircraft without adding a great deal of top-weight.

The vessel is equally capable as an escort to civilian vessels, and is fitted with depth charges. The torpedo fit is expected to deter smaller raiders and give the ship a fighting chance against a larger marauder.

Note that the torpedoes do cause the ship to be restricted; India is dipping into its CDS tonnage to build the type. Four units are anticipated.



Nanda Devi, S-122, laid down 1929
Kula Kangri, S-123, laid down 1929
Karakaram, S-126, laid down 1930
Pidurutalagda, S-128, laid down 1930

Length, 92.5 m x Beam, 9.9 m x Depth, 3.4 m
1413 tonnes normal displacement (1050 tonnes standard)

Main battery: 2 x 12.5-cm (1 x 2)
Secondary battery: 4 x 3.5-cm (2 x 2)
AA battery: 4 x 1.5-cm (1 x 4)

Weight of broadside: 57 kg

4 TT, 55.0 cm (1 x 4)

Misc. Weight:
25 t: Seaplane and aviation facilities
25 t: Catapult
10 t: Depth charges

Hull unarmored

Battery armor:
Main, 3.0 cm / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 8004 shaft kw = 24.28 knots
Approximate cruising radius, 15000 nm / 12 knots

Typical complement: 115-150


Estimated cost, $1.514 million (£378,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 16 tonnes = 1 pct
Armor, total ..................... 16 tonnes = 1 pct

Armament 16 tonnes = 1 pct

Machinery ........................ 329 tonnes = 23 pct
Hull and fittings; equipment ..... 590 tonnes = 42 pct
Fuel, ammunition, stores ......... 402 tonnes = 28 pct
Miscellaneous weights ............ 60 tonnes = 4 pct
-----
1413 tonnes = 100 pct

Estimated metacentric height, 0.4 m

Displacement summary:

Light ship: 1011 tonnes
Standard displacement: 1050 tonnes
Normal service: 1413 tonnes
Full load: 1697 tonnes

Loading submergence 541 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.20

Shellfire needed to sink: 1042 kg = 38.5 x 12.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.8
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 86 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.32

Relative quality as a seaboat: 1.72

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.26
'Natural speed' for length = 17.4 knots
Power going to wave formation
at top speed: 57 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 89 percent

Relative accommodation and working space: 111 percent


Displacement factor: 164 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.92
(Structure weight per square
metre of hull surface: 264 kg)

Relative longitudinal hull strength: 2.38
(for 4.30 m average freeboard;
freeboard adjustment +1.18 m)

Relative composite hull strength: 1.01

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

303.40 x 32.47 x 11.15; 14.10 -- Dimensions
0.45 -- Block coefficient
1929 -- Year laid down
24.28 / 15000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
60 tons -- Miscellaneous weights
++++++++++
2 x 4.92; 1 -- Main battery; turrets
Central positioning of guns
:
4 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
4 / 0 / 21.65 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.18 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

8

Wednesday, May 24th 2006, 3:50pm

[SIZE=3]Kudligi Class Paritraataa[/SIZE]

The Kudligi class paratraatii are designed to be multi-purpose escorts - essentially, slow destroyers, capable of screening their charges against aerial, submarine, and limited surface threats. A variation on the Nanda Devi class frigate, four units will be laid down in 1931.



Kudligi, S-131, laid down 1931
Patan, S-132, laid down 1931
Orai, S-135, to be laid down 1931
Shiliguri, S-136, to be laid down 1931

Length, 92.5 m x Beam, 9.9 m x Depth, 3.4 m
1412 tonnes normal displacement (1123 tonnes standard)

Main battery: 4 x 12.5-cm (2 x 2)
Secondary battery: 6 x 3.5-cm
AA battery: 4 x 1.5-cm

Weight of broadside: 112 kg

4 TT, 55.0 cm

Hull unarmored

Battery armor:
Main, 3.0 cm / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 8003 shaft kw = 24.28 knots
Approximate cruising radius, 12000 nm / 12 knots

Typical complement: 115-150


Estimated cost, $1.892 million (£473,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 31 tonnes = 2 pct
Armor, total ..................... 31 tonnes = 2 pct

Armament 31 tonnes = 2 pct

Machinery ........................ 321 tonnes = 23 pct
Hull and fittings; equipment ..... 631 tonnes = 45 pct
Fuel, ammunition, stores ......... 338 tonnes = 24 pct
Miscellaneous weights ............ 60 tonnes = 4 pct
-----
1412 tonnes = 100 pct

Estimated metacentric height, 0.4 m

Displacement summary:

Light ship: 1074 tonnes
Standard displacement: 1123 tonnes
Normal service: 1412 tonnes
Full load: 1638 tonnes

Loading submergence 541 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.18

Shellfire needed to sink: 964 kg = 35.6 x 12.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.7
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 71 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.58

Relative quality as a seaboat: 1.65

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.26
'Natural speed' for length = 17.4 knots
Power going to wave formation
at top speed: 57 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 96 percent

Relative accommodation and working space: 95 percent


Displacement factor: 144 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.91
(Structure weight per square
metre of hull surface: 283 kg)

Relative longitudinal hull strength: 2.43
(for 4.30 m average freeboard;
freeboard adjustment +1.18 m)

Relative composite hull strength: 1.00

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

303.40 x 32.47 x 11.15; 14.10 -- Dimensions
0.45 -- Block coefficient
1931 -- Year laid down
24.28 / 12000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
60 tons -- Miscellaneous weights
++++++++++
4 x 4.92; 2; 0 -- Main battery; turrets; superfiring
:
6 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
4 / 0 / 21.65 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.18 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

9

Friday, July 28th 2006, 8:12pm

[SIZE=3]Sri Pada Class Survey Ship[/SIZE]

This is a very close variant of the Nanda Devi class frigate. The notable difference is that the torpedo tubes have been omitted in exchange for a larger aft superstructure, which contains working space for a surveying party involved in charting atolls and conducting bathymetry studies. Depth charge throwers have also been added to allow for an ASW function.

Two units were laid down in 1932. A replacement for the lost Sri Pada was ordered in 1942 to the same design.




Sri Pada, S-146, laid down 1932, lost 1938
Kachenhenga, S-147, laid down 1932
Batalegara, S-170, laid down 1942

Length, 92.5 m x Beam, 9.9 m x Depth, 3.4 m
1413 tonnes normal displacement (1056 tonnes standard)

Main battery: 2 x 12.5-cm (1 x 2)
Secondary battery: 4 x 3.5-cm
AA battery: 4 x 1.5-cm

Weight of broadside: 57 kg

Hull unarmored

Battery armor:
Main, 3.0 cm / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 8004 shaft kw = 24.28 knots
Approximate cruising radius, 15000 nm / 12 knots

Typical complement: 115-150

Miscellaneous Weight:
-25 t: 1 aircraft
-25 t: catapult
-10 t: ASDIC
-20 t: Depth Charges and two throwers



Estimated cost, $1.691 million (£423,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

Excellent seaboat; comfortable and able to fight her guns
in the heaviest weather.

Ship is roomy, with superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 16 tonnes = 1 pct
Armor, total ..................... 16 tonnes = 1 pct

Armament 16 tonnes = 1 pct

Machinery ........................ 317 tonnes = 22 pct
Hull and fittings; equipment ..... 589 tonnes = 42 pct
Fuel, ammunition, stores ......... 395 tonnes = 28 pct
Miscellaneous weights ............ 80 tonnes = 6 pct
-----
1413 tonnes = 100 pct

Estimated metacentric height, 0.4 m

Displacement summary:

Light ship: 1017 tonnes
Standard displacement: 1056 tonnes
Normal service: 1413 tonnes
Full load: 1692 tonnes

Loading submergence 541 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.25

Shellfire needed to sink: 1079 kg = 39.8 x 12.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.8
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.27

Relative quality as a seaboat: 1.72

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.45
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 8.26
'Natural speed' for length = 17.4 knots
Power going to wave formation
at top speed: 57 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 88 percent

Relative accommodation and working space: 135 percent


Displacement factor: 165 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.92
(Structure weight per square
metre of hull surface: 264 kg)

Relative longitudinal hull strength: 2.38
(for 4.30 m average freeboard;
freeboard adjustment +1.18 m)

Relative composite hull strength: 1.01

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

303.40 x 32.47 x 11.15; 14.10 -- Dimensions
0.45 -- Block coefficient
1932 -- Year laid down
24.28 / 15000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
80 tons -- Miscellaneous weights
++++++++++
2 x 4.92; 1 -- Main battery; turrets
Central positioning of guns
:
4 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.18 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

10

Tuesday, August 8th 2006, 3:05pm

[SIZE=3]S Class Charavaahaa[/SIZE]

Surplus ex-SAE sloops acquired for a song as the El Derretir crisis began. The ship's use of coal is considered a benefit, as they will not draw on naval stocks of oil that may be affected by domestic production shortfalls or erratic global prices.

The class is due for a refit, but there is a general expectation that they will be discarded once El Derretir is contained.

Shimla, ex-Searcher, S-138, laid down 1914
Saharanpur, ex-Seraph, S-139, laid down 1914
Saidpur, ex-Saladin, S-140, laid down 1914
Siwan, ex-Serene, S-141, laid down 1914
Sangli, ex-Sesame, S-142, laid down 1914
Shimoga, ex-Shamrock, S-143, laid down 1914
Salem, ex-Splendid, S-144, laid down 1915
Santahar, ex-Spindrift, S-145, laid down 1915

Displacement:
948 t light; 985 t standard; 1.426 t normal; 1.774 t full load
Loading submergence 147 tons/feet

Dimensions:
229,66 ft x 33,46 ft x 11,81 ft (normal load)
70,00 m x 10,20 m x 3,60 m

Armament:
2 - 4,13" / 105 mm guns
2 - 2,17" / 55 mm guns
1 - 3,46" / 88 mm AA guns
Weight of broadside 102 lbs / 46 kg

Armour:
Main gun shields 0,98" / 25 mm, 2nd gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 3.352 ihp / 2.500 Kw = 17,29 kts
Range 12.500nm at 10,00 kts

Complement:
116 - 150

Cost:
£0,095 million / $0,380 million

Distribution of weights at normal displacement:
Armament: 13 tons, 0,9%
Armour: 3 tons, 0,2%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,2%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 221 tons, 15,5%
Hull, fittings & equipment: 411 tons, 28,8%
Fuel, ammunition & stores: 479 tons, 33,6%
Miscellaneous weights: 300 tons, 21,0%

Metacentric height 1,3

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,17
Shellfire needed to sink: 2.096 lbs / 951 Kg = 59,4 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0,9
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,09
Relative quality as seaboat: 1,58

Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,24
'Natural speed' for length: 15,15 kts
Power going to wave formation at top speed: 54 %
Trim: 45
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 80,5%
Relative accommodation and working space: 97,1%
(Average = 100%)
Displacement factor: 169%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,94
(Structure weight / hull surface area: 48 lbs / square foot or 234 Kg / square metre)
Relative longitudinal hull strength: 2,48
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,22 ft)
Relative composite hull strength: 1,03

11

Thursday, October 26th 2006, 5:44pm

[SIZE=3]Kantabanji Class Paratraatii[/SIZE]



Though lumped into the same classification as slower escorts, the Kantabanji class is essentially a high-speed gunboat designed to defend Indian shipping against small, fast craft in the Persian Gulf and Red Sea. The small hull allows for rapid construction in Type Zero facilities. As the design was rather hastily put together, it is anticipated that some shortcomings will be noticed once the vessels are in service.

The main armament consists of two 75 mm guns, fore and aft. Heavier 10.5 cm guns were preferred but two could not be fitted onto the hull without weakening the hull unacceptably. As it is, the lighter guns and their lighter shells should allow for a period of rapid fire before loader fatigue begins to be an issue. Although torpedos would be nice to add a strong anti-shipping punch, the deck space necessary for the gun armament precludes it.

Miscellaneous weight is provided for depth charges; ASDIC is not currently fitted.

Kantabanji, S-148, laid down 1932
Ambikapur, S-149, laid down 1932
Titlagarh, S-150, laid down 1932
Boran, S-151, laid down 1932

Length, 70.0 m x Beam, 6.9 m x Depth, 2.8 m
545 tonnes normal displacement (498 tonnes standard)

Main battery: 2 x 7.5-cm
Secondary battery: 4 x 3.5-cm
AA battery: 4 x 1.5-cm

Weight of broadside: 14 kg

Hull unarmored

Battery armor:
Main, 3.0 cm shields / secondary, 2.0 cm shields
AA, 2.0 cm shields

Maximum speed for 16009 shaft kw = 32.08 knots
Approximate cruising radius, 3500 nm / 12 knots

Typical complement: 56-73


Estimated cost, $1.115 million (£279,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

Ship has slow, easy roll; a good, steady gun platform.

Magazines and engineering spaces are cramped, with poor
watertight subdivision.

Roomy upper decks; superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 4 tonnes = 1 pct
Armor, total ..................... 3 tonnes = 1 pct

Armament 3 tonnes = 1 pct

Machinery ........................ 294 tonnes = 54 pct
Hull and fittings; equipment ..... 178 tonnes = 33 pct
Fuel, ammunition, stores ......... 61 tonnes = 11 pct
Miscellaneous weights ............ 5 tonnes = 1 pct
-----
545 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 484 tonnes
Standard displacement: 498 tonnes
Normal service: 545 tonnes
Full load: 581 tonnes

Loading submergence 264 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.09

Shellfire needed to sink: 69 kg = 11.8 x 7.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.2
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 72 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.15

Relative quality as a seaboat: 1.03

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.40
Sharpness coefficient: 0.29
Hull speed coefficient 'M' = 8.59
'Natural speed' for length = 15.2 knots
Power going to wave formation
at top speed: 74 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 180 percent

Relative accommodation and working space: 125 percent


Displacement factor: 42 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 135 kg)

Relative longitudinal hull strength: 2.53
(for 4.00 m average freeboard;
freeboard adjustment +1.42 m)

Relative composite hull strength: 0.59

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

229.60 x 22.63 x 9.18; 13.12 -- Dimensions
0.40 -- Block coefficient
1932 -- Year laid down
32.08 / 3500 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
5 tons -- Miscellaneous weights
++++++++++
2 x 2.95; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
4 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
4 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.18 / 0.79 / 0.79 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

12

Sunday, November 25th 2007, 2:10am

[size=3]Shimla Class Paritraataa[/size]

Shimla, laid down 1934
Saharanpur, laid down 1934
Saidpur, laid down 1934
Siwan, laid down 1934
Sangli. laid down 1935
Shimoga, laid down 1935

Note: Use 1927 engine year to make use of surplus machinery.

Displacement:
1,060 t light; 1,124 t standard; 1,414 t normal; 1,646 t full load

Dimensions: Length overall / water x beam x draught
314.64 ft / 303.48 ft x 32.48 ft x 11.15 ft (normal load)
95.90 m / 92.50 m x 9.90 m x 3.40 m

Armament:
4 - 4.92" / 125 mm guns (2x2 guns), 59.59lbs / 27.03kg shells, 1934 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
6 - 1.38" / 35.0 mm guns (3x2 guns), 1.31lbs / 0.59kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 2 raised mounts
8 - 0.59" / 15.0 mm guns (2x4 guns), 0.10lbs / 0.05kg shells, 1934 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 247 lbs / 112 kg
Shells per gun, main battery: 250
4 - 21.7" / 550 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.79" / 20 mm - -
3rd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 8,043 shp / 6,000 Kw = 22.61 kts
Range 12,000nm at 12.00 kts (Bunkerage = 522 tons)

Complement:
114 - 149

Cost:
£0.484 million / $1.936 million

Distribution of weights at normal displacement:
Armament: 31 tons, 2.2 %
Armour: 14 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 254 tons, 18.0 %
Hull, fittings & equipment: 701 tons, 49.6 %
Fuel, ammunition & stores: 354 tons, 25.0 %
Miscellaneous weights: 60 tons, 4.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,588 lbs / 1,174 Kg = 43.4 x 4.9 " / 125 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.3 ft / 0.4 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.95

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.450
Length to Beam Ratio: 9.34 : 1
'Natural speed' for length: 17.42 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 17.72 ft / 5.40 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 14.09 ft / 4.30 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81.5 %
- Above water (accommodation/working, high = better): 99.5 %
Waterplane Area: 6,287 Square feet or 584 Square metres
Displacement factor (Displacement / loading): 171 %
Structure weight / hull surface area: 57 lbs/sq ft or 278 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 3.80
- Overall: 1.07
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

This post has been edited 1 times, last edit by "perdedor99" (Aug 27th 2008, 2:22pm)


13

Friday, November 30th 2007, 11:54pm

[size=3]Salem Class Paritraataa[/size]

Salem, laid down 1935
Santahar, laid down 1935
Vyara, laid down 1935
Vapi, laid down 1935
Vasai, laid down 1935
Virar, laid down 1935

Displacement:
1,082 t light; 1,145 t standard; 1,414 t normal; 1,628 t full load

Dimensions: Length overall / water x beam x draught
314.64 ft / 303.48 ft x 32.48 ft x 11.15 ft (normal load)
95.90 m / 92.50 m x 9.90 m x 3.40 m

Armament:
4 - 4.92" / 125 mm guns (2x2 guns), 59.59lbs / 27.03kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
6 - 1.38" / 35.0 mm guns (3x2 guns), 1.31lbs / 0.59kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 2 raised mounts
8 - 0.59" / 15.0 mm guns (2x4 guns), 0.10lbs / 0.05kg shells, 1935 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 247 lbs / 112 kg
Shells per gun, main battery: 250
4 - 21.7" / 550 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.79" / 20 mm - -
3rd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 8,039 shp / 5,997 Kw = 22.61 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 483 tons

Complement:
114 - 149

Cost:
£0.488 million / $1.950 million

Distribution of weights at normal displacement:
Armament: 31 tons, 2.2 %
Armour: 14 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 228 tons, 16.2 %
Hull, fittings & equipment: 748 tons, 52.9 %
Fuel, ammunition & stores: 332 tons, 23.5 %
Miscellaneous weights: 60 tons, 4.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,749 lbs / 1,247 Kg = 46.1 x 4.9 " / 125 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.52
Seaboat quality (Average = 1.00): 1.93

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.450
Length to Beam Ratio: 9.34 : 1
'Natural speed' for length: 17.42 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 17.72 ft / 5.40 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 14.09 ft / 4.30 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 75.7 %
- Above water (accommodation/working, high = better): 99.5 %
Waterplane Area: 6,287 Square feet or 584 Square metres
Displacement factor (Displacement / loading): 182 %
Structure weight / hull surface area: 61 lbs/sq ft or 296 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 4.07
- Overall: 1.14
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

This post has been edited 4 times, last edit by "perdedor99" (Aug 27th 2008, 2:24pm)


14

Saturday, December 1st 2007, 12:32am

[size=3]A-2 Class ASW Launch[/size]

A-45 to A-50, laid down 1934
A-51 to A-56, laid down ???
A-57 to A-65, laid down 1942
A-66 to A-67, laid down 1943

Displacement:
195 t light; 203 t standard; 220 t normal; 234 t full load

Dimensions: Length overall / water x beam x draught
131.23 ft / 131.23 ft x 19.03 ft x 6.56 ft (normal load)
40.00 m / 40.00 m x 5.80 m x 2.00 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1934 Model
Dual purpose gun in deck mount
on centreline forward
1 - 1.38" / 35.0 mm guns in single mounts, 1.31lbs / 0.59kg shells, 1934 Model
Anti-aircraft gun in deck mount
on centreline
2 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1934 Model
Machine guns in deck mounts
on centreline, evenly spread, all raised mounts
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm - -
2nd: 0.79" / 20 mm - -
3rd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 2,440 shp / 1,821 Kw = 20.00 kts
Range 2,000nm at 12.00 kts
Bunker at max displacement = 31 tons

Complement:
28 - 37

Cost:
£0.101 million / $0.403 million

Distribution of weights at normal displacement:
Armament: 5 tons, 2.1 %
Armour: 5 tons, 2.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 2.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 70 tons, 31.9 %
Hull, fittings & equipment: 100 tons, 45.2 %
Fuel, ammunition & stores: 25 tons, 11.3 %
Miscellaneous weights: 16 tons, 7.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
197 lbs / 89 Kg = 5.6 x 4.1 " / 105 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.470
Length to Beam Ratio: 6.90 : 1
'Natural speed' for length: 11.46 kts
Power going to wave formation at top speed: 72 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.83 ft / 4.52 m
- Forecastle (20 %): 8.76 ft / 2.67 m
- Mid (50 %): 8.76 ft / 2.67 m
- Quarterdeck (15 %): 8.76 ft / 2.67 m
- Stern: 8.76 ft / 2.67 m
- Average freeboard: 9.25 ft / 2.82 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 127.5 %
- Above water (accommodation/working, high = better): 92.3 %
Waterplane Area: 1,549 Square feet or 144 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 29 lbs/sq ft or 141 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 8.96
- Overall: 1.07
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate

15

Thursday, August 28th 2008, 8:21pm

[size=3]Vidisha Class Paritraataa [/size]

Vidisha, laid down 1938
Vellore, laid down 1938
Viluppuram, laid down 1938
Vijayawada, laid down 1938
Valsad, laid down 1939
Vaikom, laid down 1939

Repeat of the Kudligi Class.

Displacement:
1,082 t light; 1,145 t standard; 1,414 t normal; 1,628 t full load

Dimensions: Length overall / water x beam x draught
314.64 ft / 303.48 ft x 32.48 ft x 11.15 ft (normal load)
95.90 m / 92.50 m x 9.90 m x 3.40 m

Armament:
4 - 4.92" / 125 mm guns (2x2 guns), 59.59lbs / 27.03kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
6 - 1.38" / 35.0 mm guns (3x2 guns), 1.31lbs / 0.59kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 2 raised mounts
8 - 0.59" / 15.0 mm guns (2x4 guns), 0.10lbs / 0.05kg shells, 1938 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 247 lbs / 112 kg
Shells per gun, main battery: 250
4 - 21.7" / 550 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.79" / 20 mm - -
3rd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 8,039 shp / 5,997 Kw = 22.61 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 483 tons

Complement:
114 - 149

Cost:
£0.488 million / $1.950 million

Distribution of weights at normal displacement:
Armament: 31 tons, 2.2 %
Armour: 14 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 14 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 228 tons, 16.2 %
Hull, fittings & equipment: 748 tons, 52.9 %
Fuel, ammunition & stores: 332 tons, 23.5 %
Miscellaneous weights: 60 tons, 4.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,749 lbs / 1,247 Kg = 46.1 x 4.9 " / 125 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.52
Seaboat quality (Average = 1.00): 1.93

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.450
Length to Beam Ratio: 9.34 : 1
'Natural speed' for length: 17.42 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 17.72 ft / 5.40 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 14.09 ft / 4.30 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 75.7 %
- Above water (accommodation/working, high = better): 99.5 %
Waterplane Area: 6,287 Square feet or 584 Square metres
Displacement factor (Displacement / loading): 182 %
Structure weight / hull surface area: 61 lbs/sq ft or 296 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 4.07
- Overall: 1.14
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

This post has been edited 2 times, last edit by "perdedor99" (Apr 23rd 2009, 2:21pm)


16

Wednesday, November 7th 2012, 1:11am

[size=3]Thrissur Class Charavaahaa[/size]

The Thrissur class charavaahaa will begin construction in 1943. This escort is configured primarily for defence of civilian and fleet train vessels from submarine and aircraft.

This is the first unit to ship the Mangus ASW rocket launcher system, a device that has been tinkered with on and off for years (early experiments took place aboard the old light cruiser Jaipur). The system mounts nineteen rockets in a launcher in "Anton" position and are fired in one near-simultaneous salvo by remote control. 15 tonnes has been allocated to the loaded system, and 1 tonne to each reload salvo. As with the historical Hedgehog, it is assumed that the system can be manually reloaded in a few minutes.

Consideration was given to equipping the ship with 6x57mm rather than the various 125mm, 35mm, and 15mm, but it was felt that this compromised the vessel's ability to duke it out with a surfaced submarine or merchant raider.

As no torpedos are shipped (primarily due to lack of deck space) the unit is not considered a paritraataa like most other ocean-going escorts.

Thrissur, S-171, laid down 1943
Sindgi, S-172, laid down 1943

Thrissur, Bharati escort laid down 1943

Displacement:
1,182 t light; 1,236 t standard; 1,628 t normal; 1,942 t full load

Dimensions: Length overall / water x beam x draught
288.22 ft / 278.87 ft x 36.42 ft x 12.47 ft (normal load)
87.85 m / 85.00 m x 11.10 m x 3.80 m

Armament:

2 - 4.92" / 125 mm guns in single mounts, 59.59lbs / 27.03kg shells, 1943 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts
4 - 1.38" / 35.0 mm guns (2x2 guns), 1.31lbs / 0.59kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.59" / 15.0 mm guns (1x4 guns), 0.10lbs / 0.05kg shells, 1943 Model
Machine guns in deck mount
on centreline aft, one raised mount Weight of broadside 125 lbs / 57 kg
19 – Mangus ASW rockets in single mount
Tube carriage
on centreline forward
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 14,000 shp / 10,444 Kw = 24.93 kts
Range 10,000nm at 15.00 kts (Bunkerage = 706 tons)

Complement:
127 - 166

Cost:
£0.688 million / $2.751 million

Distribution of weights at normal displacement:
Armament: 16 tons, 1.0 %
Armour: 11 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 362 tons, 22.2 %
Hull, fittings & equipment: 673 tons, 41.3 %
Fuel, ammunition & stores: 446 tons, 27.4 %
Miscellaneous weights: 120 tons, 7.4 %
-40 t: Weight reserve
-20 t: Rails, throwers, and 60 depth charges
-10 t: Radar
-10 t: Sonar
-10 t: Miscellaneous other electronics
-18 t: Mangus ASW system (15 t) with three reload salvos
-12 t: Blast-shielding aft of, and deck reinforcement below, Mangus ASW system



Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,663 lbs / 1,208 Kg = 44.7 x 4.9 " / 125 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.6 ft / 0.5 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.22
Seaboat quality (Average = 1.00): 1.34

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.450
Length to Beam Ratio: 7.66 : 1
'Natural speed' for length: 16.70 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.64 ft / 6.90 m
- Forecastle (20 %): 18.70 ft / 5.70 m
- Mid (50 %): 18.70 ft / 5.70 m (10.83 ft / 3.30 m aft of break)
- Quarterdeck (15 %): 10.83 ft / 3.30 m
- Stern: 10.83 ft / 3.30 m
- Average freeboard: 15.08 ft / 4.60 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 88.8 %
- Above water (accommodation/working, high = better): 140.5 %
Waterplane Area: 6,478 Square feet or 602 Square metres
Displacement factor (Displacement / loading): 166 %
Structure weight / hull surface area: 55 lbs/sq ft or 269 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 4.21
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

17

Sunday, November 9th 2014, 2:36pm

Ambala Class Charavaahii

This coastal escort type is in no respects spectacular, but it does have a reasonable top speed and a full Mangus ASW system for submarine hunting. The 105 mm gun allows engagement of surfaced submarines or delivery of warning shots across bows; the 57 mm installation provides some additional air defence, though the ship would normally be under Bharati land-based air cover anyway.

A basic winch and boom kit has been included for limited minesweeping capability; this would also be useful for retrieving practice torpedoes, wreckage, and other materials in the water.

Ambala, S-173, laid down 1945
Chankanai, S-174, laid down 1945
Invuil, S-175, laid down 1945
Ishwardi, S-176, laid down 1945
Satkhira, S-177, laid down 1945
Basirhat, S-178, laid down 1945
Dhemaji, S-179, laid down 1946
Mangaldai, S-180, laid down 1946
Moragaon, S-181, laid down 1946
Haflong, S-182, laid down 1946
Tezpur, S-183, laid down 1946
Tinsukla, S-184, laid down 1946

Ambala, coastal escort laid down 1945

Displacement:
499 t light; 517 t standard; 611 t normal; 686 t full load

Dimensions: Length overall / water x beam x draught
209.14 ft / 200.13 ft x 25.59 ft x 8.69 ft (normal load)
63.75 m / 61.00 m x 7.80 m x 2.65 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1945 Model
Dual purpose gun in deck mount
on centreline forward
2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1945 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1945 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 47 lbs / 21 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 6,435 shp / 4,800 Kw = 22.93 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 168 tons

Complement:
60 - 79

Cost:
£0.312 million / $1.248 million

Distribution of weights at normal displacement:
Armament: 6 tons, 1.0 %
Armour: 3 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 162 tons, 26.6 %
Hull, fittings & equipment: 242 tons, 39.7 %
Fuel, ammunition & stores: 112 tons, 18.3 %
Miscellaneous weights: 85 tons, 13.9 %
-20 t: Mangus ASW system and five reload salvoes
-10 t: Blast shielding around Mangus and deck reinforcement below
-25 t: Basic sonar, radar and fire control fittings
-25 t: Minesweeping kit
-5 t: Miscellaneous weight

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
749 lbs / 340 Kg = 21.2 x 4.1 " / 105 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 0.8 ft / 0.3 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.11
Seaboat quality (Average = 1.00): 1.15

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.480
Length to Beam Ratio: 7.82 : 1
'Natural speed' for length: 14.15 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.75 ft / 4.80 m
- Forecastle (20 %): 12.80 ft / 3.90 m
- Mid (50 %): 12.80 ft / 3.90 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 11.56 ft / 3.52 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 109.4 %
- Above water (accommodation/working, high = better): 119.2 %
Waterplane Area: 3,352 Square feet or 311 Square metres
Displacement factor (Displacement / loading): 133 %
Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 4.92
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
The Rock Doctor has attached the following file:
  • coastal sloop.bmp (136.54 kB - 88 times downloaded - latest: Dec 26th 2017, 2:29pm)