[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
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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
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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
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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
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[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
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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
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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)
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