WesWorld

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

Wondering, are torpedoes included with the tubes? If not, how do I do that?

No they are not. I'm not sure about the others, but I usually use the weight of the main belt armor to simulate the weight of torpedoes. The location of the miscellaneous weights on an SS2 simmed vessel is way to high for submarines (SS2 miscellaneous weight is located above the main deck so in a sense, according to SS the ballast tanks are located above the deck, outside the submarine's hull) so it is pretty much impossible to use miscellaneous weights for the torpedoes as that would mean that the stability of the submarine drops below 1 rather quickly if you add a few torpedoes even if you stick to 1/6 of the displacement = ballast tank.

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

A transom stern doesn't really sound like a good idea on a submarine.

Bad idea for stability to do that?

How would submarine armor work? I tried it with this 290 ton submarine and it became unstable and actually even easier to sink.