WesWorld

Penner Class Minesweeper (4 units*) - 1916-9

Ganges Class Minesweeper (2 units) - 1921

Brahmaputra Class Minesweeper (12 units) - 1922-4

Chindwin Class Minesweeper (4 units) - 1924-7

L-1 Class Minelayer (0 units) - 1926-7

L-5 Class Minelayer (7 units) - 1932

Pali Class Minesweeper (4 units) - 1939



*Maybe. Names re-used later, so may have been discarded.

[SIZE=3]Penner Class Oceanic Minesweeper[/SIZE]



Penner, AM-1, laid down 1916, refitted 1931
Maha, AM-2, laid down 1917, refitted 1931
Pali, AM-3, laid down 1918
Menik, AM-4, laid down 1919

Penner, laid down 1916

Length, 61.0 m x Beam, 9.1 m x Depth, 2.7 m
771 tonnes normal displacement (692 tonnes standard)

Main battery: 1 x 10.5-cm
Secondary battery: 2 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 1599 shaft kw = 16.84 knots
Approximate cruising radius, 4000 nm / 10 knots

Typical complement: 73-95


Estimated cost, $261,000 (£65,000)

Remarks:

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

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tonnes = 1 pct
Armor, total ..................... 3 tonnes = 0 pct

Armament 3 tonnes = 0 pct

Machinery ........................ 88 tonnes = 11 pct
Hull and fittings; equipment ..... 518 tonnes = 67 pct
Fuel, ammunition, stores ......... 98 tonnes = 13 pct
Miscellaneous weights ............ 60 tonnes = 8 pct
-----
771 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 673 tonnes
Standard displacement: 692 tonnes
Normal service: 771 tonnes
Full load: 832 tonnes

Loading submergence 353 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.08

Shellfire needed to sink: 858 kg = 53.5 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.2
(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, 0.05

Relative quality as a seaboat: 1.40

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


Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.38
Hull speed coefficient 'M' = 6.66
'Natural speed' for length = 14.1 knots
Power going to wave formation
at top speed: 55 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 51 percent

Relative accommodation and working space: 100 percent


Displacement factor: 278 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.93
(Structure weight per square
metre of hull surface: 409 kg)

Relative longitudinal hull strength: 5.20
(for 3.10 m average freeboard;
freeboard adjustment +0.33 m)

Relative composite hull strength: 2.13

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


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

200.00 x 30.00 x 9.00; 10.17 -- Dimensions
0.50 -- Block coefficient
1916 -- Year laid down
16.84 / 4000 / 10.00; Turbine, coal fired -- Speed / radius / cruise
60 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
:
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)


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

[SIZE=3]Ganges Class Oceanic Minesweeper[/SIZE]

Ganges, AM-5, laid down 1921
Ayeyarwaddy, AM-6, laid down 1921

Ganges, laid down 1921

Length, 61.0 m x Beam, 9.1 m x Depth, 2.7 m
771 tonnes normal displacement (694 tonnes standard)

Main battery: 1 x 10.5-cm
Secondary battery: 2 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 1599 shaft kw = 16.84 knots
Approximate cruising radius, 4000 nm / 12 knots

Typical complement: 73-95


Estimated cost, $386,000 (£97,000)

Remarks:

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

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tonnes = 1 pct
Armor, total ..................... 3 tonnes = 0 pct

Armament 3 tonnes = 0 pct

Machinery ........................ 74 tonnes = 10 pct
Hull and fittings; equipment ..... 534 tonnes = 69 pct
Fuel, ammunition, stores ......... 96 tonnes = 13 pct
Miscellaneous weights ............ 60 tonnes = 8 pct
-----
771 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 675 tonnes
Standard displacement: 694 tonnes
Normal service: 771 tonnes
Full load: 831 tonnes

Loading submergence 353 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.07

Shellfire needed to sink: 962 kg = 59.9 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.4
(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, 0.05

Relative quality as a seaboat: 1.39

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


Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.38
Hull speed coefficient 'M' = 6.66
'Natural speed' for length = 14.1 knots
Power going to wave formation
at top speed: 55 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 46 percent

Relative accommodation and working space: 100 percent


Displacement factor: 310 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.99
(Structure weight per square
metre of hull surface: 421 kg)

Relative longitudinal hull strength: 5.36
(for 3.10 m average freeboard;
freeboard adjustment +0.33 m)

Relative composite hull strength: 2.20

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


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

200.00 x 30.00 x 9.00; 10.17 -- Dimensions
0.50 -- Block coefficient
1921 -- Year laid down
16.84 / 4000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
60 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
:
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)


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

[SIZE=3]Brahmaputra Class Coastal Minesweeper[/SIZE]

Brahmaputra, AM-7, laid down 1922
Narmada, AM-8, laid down 1922
Ghaghara, AM-9, laid down 1922
Yamuna, AM-10, laid down 1922
Irrawaddy, AM-11, laid down 1922
Kala Ovu, AM-12, laid down 1922
Tunghabhadra, AM-13, laid down 1922
Banas, AM-14, laid down 1923
Tapi, AM-15, laid down 1923
Kaveri, AM-16, laid down 1923
Jhekun, AM-17, laid down 1923
Kaladan, AM-18, laid down 1924

Brahmaputra, laid down 1922

Length, 48.8 m x Beam, 8.5 m x Depth, 2.6 m
544 tonnes normal displacement (479 tonnes standard)

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

Weight of broadside: 17 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 2000 shaft kw = 18.15 knots
Approximate cruising radius, 4000 nm / 12 knots

Typical complement: 56-73


Estimated cost, $360,000 (£90,000)

Remarks:

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

Good seaboat; rides out heavy weather easily.

Magazines and engineering spaces are roomy, with superior
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tonnes = 1 pct
Armor, total ..................... 104 tonnes = 19 pct

Belt 57 tonnes = 11 pct
Deck 41 tonnes = 8 pct
C.T. 3 tonnes = 1 pct
Armament 3 tonnes = 1 pct

Machinery ........................ 91 tonnes = 17 pct
Hull and fittings; equipment ..... 225 tonnes = 41 pct
Fuel, ammunition, stores ......... 79 tonnes = 15 pct
Miscellaneous weights ............ 40 tonnes = 7 pct
-----
544 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 465 tonnes
Standard displacement: 479 tonnes
Normal service: 544 tonnes
Full load: 594 tonnes

Loading submergence 264 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.10

Shellfire needed to sink: 501 kg = 31.2 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, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.08

Relative quality as a seaboat: 1.35

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


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: 66 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 70 percent

Relative accommodation and working space: 109 percent


Displacement factor: 149 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.03
(Structure weight per square
metre of hull surface: 224 kg)

Relative longitudinal hull strength: 5.40
(for 3.50 m average freeboard;
freeboard adjustment +0.92 m)

Relative composite hull strength: 1.21

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


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

160.00 x 28.00 x 8.50; 11.48 -- Dimensions
0.50 -- Block coefficient
1922 -- Year laid down
18.15 / 4000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
40 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
:
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; 100 -- 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)


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

[SIZE=3]Chindwin Class Oceanic Minesweeper[/SIZE]

Chindwin, AM-19, laid down 1924
(Unnamed), AM-20, cancelled 1924
Bhima, AM-21, laid down 1925
Rihand, AM-22, laid down 1927
Kaunala, AM-23, laid down 1927

Chindwin, laid down 1924

Length, 67.1 m x Beam, 9.1 m x Depth, 3.4 m
1141 tonnes normal displacement (955 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

Hull unarmored
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 5996 shaft kw = 22.03 knots
Approximate cruising radius, 8000 nm / 12 knots

Typical complement: 98-128


Estimated cost, $954,000 (£239,000)

Distribution of weights:
Percent
normal
displacement:

Armament ......................... 9 tonnes = 1 pct
Armor, total ..................... 10 tonnes = 1 pct

C.T. 5 tonnes = 0 pct
Armament 6 tonnes = 0 pct

Machinery ........................ 265 tonnes = 23 pct
Hull and fittings; equipment ..... 442 tonnes = 39 pct
Fuel, ammunition, stores ......... 215 tonnes = 19 pct
Miscellaneous weights ............ 200 tonnes = 18 pct
-----
1141 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 926 tonnes
Standard displacement: 955 tonnes
Normal service: 1141 tonnes
Full load: 1285 tonnes

Loading submergence 414 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.03

Shellfire needed to sink: 634 kg = 39.5 x 10.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.6
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 59 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.11

Relative quality as a seaboat: 1.18

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


Hull form characteristics:

Block coefficient: 0.55
Sharpness coefficient: 0.39
Hull speed coefficient 'M' = 6.43
'Natural speed' for length = 14.8 knots
Power going to wave formation
at top speed: 67 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 101 percent

Relative accommodation and working space: 113 percent


Displacement factor: 140 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 1.08
(Structure weight per square
metre of hull surface: 271 kg)

Relative longitudinal hull strength: 3.88
(for 4.00 m average freeboard;
freeboard adjustment +1.01 m)

Relative composite hull strength: 1.22

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


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

220.00 x 30.00 x 11.00; 13.12 -- Dimensions
0.55 -- Block coefficient
1924 -- Year laid down
22.03 / 8000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
200 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
++++++++++
0.00 -- No belt armor
0.00 / 1.97 -- Deck / CT
1.97 / 0.79 / 0.79 / 0.00 -- Battery armor


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


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

[SIZE=3]L-1 Class Coastal Minelayer[/SIZE]

Pranhita, L-1, laid down 1926, to Mexico (where else?), 1935
Penganga, L-2, laid down 1926, lost 1930 (cyclone)
Dudna, L-3, laid down 1927, to Mexico 1935
Palar, L-4, laid down 1927, to Mexico 1935

L-1 class, laid down 1926

Length, 86.0 m x Beam, 7.2 m x Depth, 2.7 m
691 tonnes normal displacement (625 tonnes standard)

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

Weight of broadside: 17 kg

2 TT, 50.0 cm

Hull unarmored

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

Maximum speed for 15003 shaft kw = 31.61 knots
Approximate cruising radius, 4000 nm / 12 knots

Typical complement: 67-88


Estimated cost, $1.036 million (£259,000)

Remarks:

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

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


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 5 tonnes = 1 pct
Armor, total ..................... 3 tonnes = 0 pct

Armament 3 tonnes = 0 pct

Machinery ........................ 355 tonnes = 51 pct
Hull and fittings; equipment ..... 195 tonnes = 28 pct
Fuel, ammunition, stores ......... 83 tonnes = 12 pct
Miscellaneous weights ............ 50 tonnes = 7 pct
-----
691 tonnes = 100 pct

Estimated metacentric height, 0.3 m

Displacement summary:

Light ship: 608 tonnes
Standard displacement: 625 tonnes
Normal service: 691 tonnes
Full load: 741 tonnes

Loading submergence 344 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.27

Shellfire needed to sink: 86 kg = 5.3 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, 55 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.10

Relative quality as a seaboat: 1.10

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


Hull form characteristics:

Block coefficient: 0.41
Sharpness coefficient: 0.28
Hull speed coefficient 'M' = 9.75
'Natural speed' for length = 16.8 knots
Power going to wave formation
at top speed: 67 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 179 percent

Relative accommodation and working space: 100 percent


Displacement factor: 50 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.51
(Structure weight per square
metre of hull surface: 124 kg)

Relative longitudinal hull strength: 1.25
(for 3.60 m average freeboard;
freeboard adjustment +0.89 m)

Relative composite hull strength: 0.56

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


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

282.08 x 23.62 x 8.86; 11.81 -- Dimensions
0.41 -- Block coefficient
1926 -- Year laid down
31.61 / 4000 / 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
:
2 x 0.59 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
2 / 0 / 19.69 -- TT / submerged / size
++++++++++
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)


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

[SIZE=3]L-5 Class Coastal Minelayer[/SIZE]

This simple little vessel is a derivative of the anti-submarine launch built in large numbers over the past few years (see the Sloops and Escorts thread). It is intended to lay defensive minefields in friendly waters, so the armament, speed, and range of the vessel remain very limited. Since there is little need to be laying minefields in peace time, it is expected that these craft will also function in patrol, torpedo retrieval and search and rescue roles.

Seven units are to be built in 1932.




L-5, laid down 1932

Length, 40.0 m x Beam, 5.8 m x Depth, 2.0 m
220 tonnes normal displacement (202 tonnes

standard)

Main battery: 2 x 3.5-cm

Weight of broadside: 1 kg

Hull unarmored

Battery armor:
Main, 3.0 cm shields


Maximum speed for 2000 shaft kw = 20.43 knots
Approximate cruising radius, 2000 nm / 12 knots

Typical complement: 29-37

Miscellaneous Weight:
-5 t: Derrick (2.5 t load limit)
-15 t: Mines and minelaying gear, including 10 mines


Estimated cost, $332,000 (£83,000)

Remarks:

Magazines and engineering spaces are cramped, with

poor
watertight subdivision.


Distribution of weights:


Percent


normal


displacement:

Armor, total ..................... 1 tonnes

= 0 pct

Armament 1 tonnes

= 0 pct

Machinery ........................ 79 tonnes

= 36 pct
Hull and fittings; equipment ..... 98 tonnes

= 44 pct
Fuel, ammunition, stores ......... 22 tonnes

= 10 pct
Miscellaneous weights ............ 20 tonnes

= 9 pct
-----
220 tonnes

= 100 pct

Estimated metacentric height, 0.1 m

Displacement summary:

Light ship: 198 tonnes
Standard displacement: 202 tonnes
Normal service: 220 tonnes
Full load: 233 tonnes

Loading submergence 141 tonnes/metre

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


Estimated overall survivability and seakeeping

ability:

Relative margin of stability: 1.07

Shellfire needed to sink: 91 kg = 152.6 x 3.5-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, 51 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.02

Relative quality as a seaboat: 1.03

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


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: 73 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 128

percent

Relative accommodation and working space: 96

percent


Displacement factor: 121 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.99
(Structure weight per square
metre of hull surface: 161 kg)

Relative longitudinal hull strength: 5.61
(for 2.90 m average freeboard;
freeboard adjustment +0.75 m)

Relative composite hull strength: 1.18

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


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

131.20 x 19.02 x 6.56; 9.51 -- Dimensions
0.47 -- Block coefficient
1932 -- Year laid down
20.43 / 2000 / 12.00; Oil-fired turbine or equivalent --

Speed / radius / cruise
20 tons -- Miscellaneous weights
++++++++++
2 x 1.38; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
0 -- No secondary battery
0 -- No tertiary (QF/AA) battery
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.18 / 0.00 / 0.00 / 0.00 -- Battery armor


(Note: For portability, values are stored in

Anglo-American units)




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

Thanks to Walter for his help

Pali, Indian Minesweeper/minelayer laid down 1939

Pali, AM-24, laid down 1939
Penner, AM-25, laid down 1939
Maha, AM-26, laid down 1939
Menik, AM-27, laid down 1939

Displacement:
386 t light; 400 t standard; 420 t normal; 437 t full load

Dimensions: Length overall / water x beam x draught
157.50 ft / 157.50 ft x 19.70 ft x 7.90 ft (normal load)
48.01 m / 48.01 m x 6.00 m x 2.41 m

Armament:
2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
2 - 1.38" / 35.0 mm guns in single mounts, 1.31lbs / 0.59kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on centreline, all forward, all raised mounts - superfiring
4 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1939 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 74 lbs / 33 kg
Shells per gun, main battery: 120

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 0.40" / 10 mm -
2nd: 0.80" / 20 mm - -
3rd: 0.40" / 10 mm - -

Machinery:
Oil fired boilers, simple reciprocating steam engines,
Geared drive, 2 shafts, 1,244 ihp / 928 Kw = 15.70 kts
Range 2,000nm at 10.00 kts
Bunker at max displacement = 37 tons

Complement:
46 - 60

Cost:
£0.214 million / $0.856 million

Distribution of weights at normal displacement:
Armament: 9 tons, 2.2%
Armour: 6 tons, 1.5%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 6 tons, 1.5%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 138 tons, 32.8%
Hull, fittings & equipment: 148 tons, 35.2%
Fuel, ammunition & stores: 34 tons, 8.1%
Miscellaneous weights: 85 tons, 20.2%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
246 lbs / 112 Kg = 7.0 x 4.1 " / 105 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.73

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.600
Length to Beam Ratio: 7.99 : 1
'Natural speed' for length: 12.55 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 29
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: 13.50 ft / 4.11 m
- Forecastle (20%): 9.20 ft / 2.80 m
- Mid (55%): 9.20 ft / 2.80 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15%): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.09 ft / 2.77 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 144.6%
- Above water (accommodation/working, high = better): 82.1%
Waterplane Area: 2,269 Square feet or 211 Square metres
Displacement factor (Displacement / loading): 90%
Structure weight / hull surface area: 32 lbs/sq ft or 158 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 4.60
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather