WesWorld

A small, short-ranged U-boat.


Type II, Germany U-boat laid down 1930

Displacement:
144 t light; 147 t standard; 153 t normal; 157 t full load

Dimensions: Length overall / water x beam x draught
100.07 ft / 98.43 ft x 13.12 ft x 9.84 ft (normal load)
30.50 m / 30.00 m x 4.00 m x 3.00 m

Armament:
1 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft gun in deck mount
on centreline aft
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 450
2 - 21.0" / 533 mm above water torpedoes, 2 - 21.0" / 533 mm submerged torpedo tubes

Armour:
- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 265 shp / 198 Kw = 12.00 kts
Range 2,000nm at 8.00 kts
Bunker at max displacement = 11 tons

Complement:
21 - 28

Cost:
£0.026 million / $0.103 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 0 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.3 %
Machinery: 8 tons, 5.3 %
Hull, fittings & equipment: 72 tons, 47.2 %
Fuel, ammunition & stores: 9 tons, 5.9 %
Miscellaneous weights: 63 tons, 41.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6 lbs / 3 Kg = 25.0 x 0.8 " / 20 mm shells or 0.0 torpedoes
Stability (Unstable if below 1.00): 0.71
Metacentric height 0.1 ft / 0.0 m
Roll period: 17.3 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
Block coefficient: 0.420
Length to Beam Ratio: 7.50 : 1
'Natural speed' for length: 9.92 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 180.1 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 805 Square feet or 75 Square metres
Displacement factor (Displacement / loading): 191 %
Structure weight / hull surface area: 54 lbs/sq ft or 263 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.79
- Longitudinal: 4.01
- Overall: 2.89
Caution: Poor stability - excessive risk of capsizing
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

The external torpedoes are carried in tubes on the upper hull sides, facing forwards.
The external tube on each side can be replaced with a mine-laying tube, carrying 3 mines.

3 tons of the miscellaneous tonnage are for 2 reload torpedoes.

Quoted

Caution: Poor stability - excessive risk of capsizing

Whoops! Back to the drawing board!

It's a sub, as long as the hatches are closed, who cares?

Revised design (yeesh it's fat)


Type II, Germany U-boat laid down 1930

Displacement:
171 t light; 175 t standard; 181 t normal; 186 t full load

Dimensions: Length overall / water x beam x draught
100.07 ft / 98.43 ft x 18.70 ft x 8.20 ft (normal load)
30.50 m / 30.00 m x 5.70 m x 2.50 m

Armament:
1 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft gun in deck mount
on centreline aft
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 450
2 - 21.0" / 533 mm above water torpedoes, 2 - 21.0" / 533 mm submerged torpedo tubes

Armour:
- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 297 shp / 222 Kw = 12.00 kts
Range 2,000nm at 8.00 kts
Bunker at max displacement = 11 tons

Complement:
24 - 32

Cost:
£0.030 million / $0.122 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 1 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 9 tons, 5.0 %
Hull, fittings & equipment: 99 tons, 54.4 %
Fuel, ammunition & stores: 10 tons, 5.5 %
Miscellaneous weights: 63 tons, 34.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
89 lbs / 40 Kg = 363.9 x 0.8 " / 20 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.4 ft / 0.1 m
Roll period: 12.2 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
Block coefficient: 0.420
Length to Beam Ratio: 5.26 : 1
'Natural speed' for length: 9.92 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.3 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 1,148 Square feet or 107 Square metres
Displacement factor (Displacement / loading): 222 %
Structure weight / hull surface area: 67 lbs/sq ft or 327 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.19
- Longitudinal: 3.21
- Overall: 3.19
Hull space for machinery, storage, compartmentation is adequate
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

The external torpedoes are carried in tubes on the upper hull sides, facing forwards.
The external tube on each side can be replaced with a mine-laying tube, carrying 3 mines.

3 tons of the miscellaneous tonnage are for 2 reload torpedoes.

Quoted

It's a sub, as long as the hatches are closed, who cares?

You really need to consider the crew of the submarine. They can't properly sleep and eat and entertain themselves in a rolled over submarine and it it pretty hard to see anything through the periscope...
Why do you use 63 tons miscellaneous weights? 3 tons are for reloads, but what about the remaining 60?

Maybe need more shells for the 20mm gun. Easy enough to fire that many in 1 minute.

Quoted

Originally posted by Rooijen10

Quoted

It's a sub, as long as the hatches are closed, who cares?

You really need to consider the crew of the submarine. They can't properly sleep and eat and entertain themselves in a rolled over submarine and it it pretty hard to see anything through the periscope...
Why do you use 63 tons miscellaneous weights? 3 tons are for reloads, but what about the remaining 60?

Rooijen I think it wose your rules to use misc as the balast tank?

Heh, well, I tried to sim an Type XXIII, it came out even less stable than my original design. So I'm not sure about the validity of the stability numbers, at least in the case of subs (which could dive and get away from the waves which would be the cause of the stability issue).

The remaining 60 tons are for the ballast tanks.

Spring Style notes indicate about 1/6 to 1/4 of the normal displacement. I usually try to stick to 1/5 of the normal displacement for my designs.
Main problem with stability on SS sub sims is that miscellaneous weight is located quite high in a ship design (above the main deck). Increasing miscellaneous weight decreases stability and with 60 tons of miscellanoues weights on a 150 tons sub, I am not surprised about the low stability.

Ahah....

Type II, Germany U-boat laid down 1930

Displacement:
151 t light; 154 t standard; 160 t normal; 165 t full load

Dimensions: Length overall / water x beam x draught
100.07 ft / 98.43 ft x 13.78 ft x 9.84 ft (normal load)
30.50 m / 30.00 m x 4.20 m x 3.00 m

Armament:
1 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft gun in deck mount
on centreline aft
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 450
2 - 21.0" / 533 mm above water torpedoes, 2 - 21.0" / 533 mm submerged torpedo tubes

Armour:
- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 274 shp / 204 Kw = 12.00 kts
Range 2,000nm at 8.00 kts
Bunker at max displacement = 11 tons

Complement:
22 - 29

Cost:
£0.027 million / $0.108 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 1 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 8 tons, 5.2 %
Hull, fittings & equipment: 109 tons, 68.1 %
Fuel, ammunition & stores: 9 tons, 5.8 %
Miscellaneous weights: 33 tons, 20.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
70 lbs / 32 Kg = 288.7 x 0.8 " / 20 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.3 ft / 0.1 m
Roll period: 11.3 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
Block coefficient: 0.420
Length to Beam Ratio: 7.14 : 1
'Natural speed' for length: 9.92 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 106.9 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 846 Square feet or 79 Square metres
Displacement factor (Displacement / loading): 318 %
Structure weight / hull surface area: 80 lbs/sq ft or 390 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.03
- Longitudinal: 5.79
- Overall: 4.18
Hull space for machinery, storage, compartmentation is adequate
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

The external torpedoes are carried in tubes on the upper hull sides, facing forwards.
The external tube on each side can be replaced with a mine-laying tube, carrying 3 mines.

3 tons of the miscellaneous tonnage are for 2 reload torpedoes.