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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.

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.

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)

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

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)

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

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)

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

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)

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

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)

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

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

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

This post has been edited 2 times, last edit by "perdedor99" (Dec 5th 2009, 10:23pm)

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