So, I've decided to try out submarines.

290 Ton Class Submarine, Poland Midget Submarine laid down 1940

Displacement:

290 t light; 297 t standard; 325 t normal; 348 t full load

Dimensions: Length overall / water x beam x draught

128.12 ft / 128.12 ft x 14.76 ft (Bulges 16.40 ft) x 9.84 ft (normal load)

39.05 m / 39.05 m x 4.50 m (Bulges 5.00 m) x 3.00 m

2 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:

Diesel Internal combustion engines plus batteries,

Electric cruising motors plus geared drives, 1 shaft, 1,704 shp / 1,271 Kw = 18.00 kts

Range 3,000nm at 12.00 kts

Bunker at max displacement = 51 tons

Complement:

37 - 49

Cost:

£0.099 million / $0.397 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %

Machinery: 46 tons, 14.0 %

Hull, fittings & equipment: 170 tons, 52.3 %

Fuel, ammunition & stores: 35 tons, 10.7 %

Miscellaneous weights: 75 tons, 23.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

115 lbs / 52 Kg = 1.1 x 6 " / 152 mm shells or 0.2 torpedoes

Stability (Unstable if below 1.00): 1.00

Metacentric height 0.3 ft / 0.1 m

Roll period: 13.0 seconds

Steadiness - As gun platform (Average = 50 %): 0 %

- Recoil effect (Restricted arc if above 1.00): 0.00

Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 7.81 : 1

'Natural speed' for length: 13.10 kts

Power going to wave formation at top speed: 69 %

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: 0.10 ft / 0.03 m

- Forecastle (0 %): 0.10 ft / 0.03 m

- Mid (0 %): 0.10 ft / 0.03 m

- Quarterdeck (0 %): 0.10 ft / 0.03 m

- Stern: 0.10 ft / 0.03 m

- Average freeboard: 0.10 ft / 0.03 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 118.9 %

- Above water (accommodation/working, high = better): 0.7 %

Waterplane Area: 1,374 Square feet or 128 Square metres

Displacement factor (Displacement / loading): 196 %

Structure weight / hull surface area: 81 lbs/sq ft or 395 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 3.61

- Longitudinal: 2.67

- Overall: 2.88

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is extremely poor

Ship has quick, lively roll, not a steady gun platform

Caution: Lacks seaworthiness - very limited seakeeping ability

290 Ton Class Submarine, Poland Midget Submarine laid down 1940

Displacement:

290 t light; 297 t standard; 325 t normal; 348 t full load

Dimensions: Length overall / water x beam x draught

128.12 ft / 128.12 ft x 14.76 ft (Bulges 16.40 ft) x 9.84 ft (normal load)

39.05 m / 39.05 m x 4.50 m (Bulges 5.00 m) x 3.00 m

2 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:

Diesel Internal combustion engines plus batteries,

Electric cruising motors plus geared drives, 1 shaft, 1,704 shp / 1,271 Kw = 18.00 kts

Range 3,000nm at 12.00 kts

Bunker at max displacement = 51 tons

Complement:

37 - 49

Cost:

£0.099 million / $0.397 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %

Machinery: 46 tons, 14.0 %

Hull, fittings & equipment: 170 tons, 52.3 %

Fuel, ammunition & stores: 35 tons, 10.7 %

Miscellaneous weights: 75 tons, 23.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

115 lbs / 52 Kg = 1.1 x 6 " / 152 mm shells or 0.2 torpedoes

Stability (Unstable if below 1.00): 1.00

Metacentric height 0.3 ft / 0.1 m

Roll period: 13.0 seconds

Steadiness - As gun platform (Average = 50 %): 0 %

- Recoil effect (Restricted arc if above 1.00): 0.00

Seaboat quality (Average = 1.00): 0.00

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 7.81 : 1

'Natural speed' for length: 13.10 kts

Power going to wave formation at top speed: 69 %

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: 0.10 ft / 0.03 m

- Forecastle (0 %): 0.10 ft / 0.03 m

- Mid (0 %): 0.10 ft / 0.03 m

- Quarterdeck (0 %): 0.10 ft / 0.03 m

- Stern: 0.10 ft / 0.03 m

- Average freeboard: 0.10 ft / 0.03 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 118.9 %

- Above water (accommodation/working, high = better): 0.7 %

Waterplane Area: 1,374 Square feet or 128 Square metres

Displacement factor (Displacement / loading): 196 %

Structure weight / hull surface area: 81 lbs/sq ft or 395 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 3.61

- Longitudinal: 2.67

- Overall: 2.88

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is extremely poor

Ship has quick, lively roll, not a steady gun platform

Caution: Lacks seaworthiness - very limited seakeeping ability

... not sure about the transom stern though...

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