WesWorld

D Class, Denmark Fleet Submarine laid down 1925

K.D.M. UD1
K.D.M. UD2
K.D.M. UD3
K.D.M. UD4
K.D.M. UD5
K.D.M. UD6
K.D.M. UD7
K.D.M. UD8

Displacement:
974 t light; 1,002 t standard; 1,102 t normal; 1,177 t full load
Loading submergence 88 tons/feet

Dimensions:
250.00 ft x 32.00 ft x 20.00 ft (normal load)
76.20 m x 9.75 m x 6.10 m

Armament:
1 - 5.12" / 130 mm guns
4 - 0.79" / 20 mm AA guns
2 - 0.51" / 13 mm guns
Weight of broadside 68 lbs / 31 kg
8 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 2,054 shp / 1,532 Kw = 16.00 kts
Range 6,000nm at 10.00 kts

Complement:
95 - 124

Cost:
£0.166 million / $0.662 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0.8 %
Machinery: 67 tons, 6.1 %
Hull, fittings & equipment: 689 tons, 62.5 %
Fuel, ammunition & stores: 128 tons, 11.6 %
Miscellaneous weights: 210 tons, 19.1 %

Metacentric height 1.1

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.09
Shellfire needed to sink: 709 lbs / 322 Kg = 10.6 x 5.1 " / 130 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 1 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 0.00

Hull form characteristics:
Block coefficient: 0.241
Sharpness coefficient: 0.25
Hull speed coefficient 'M': 7.40
'Natural speed' for length: 15.81 kts
Power going to wave formation at top speed: 30 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 82.0 %
Relative accommodation and working space: 0.6 %
(Average = 100%)
Displacement factor: 268 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 2.49
(Structure weight / hull surface area: 114 lbs / square foot or 555 Kg / square metre)
Relative longitudinal hull strength: 3.39
(for 0.10 ft / 0.03 m average freeboard, freeboard adjustment -9.64 ft)
Relative composite hull strength: 2.57

Diving Depth = 256'
Emergency Depth = 410'
Crush Depth = 640'

Gemini (Experimental), Denmark Submarine laid down 1937

Displacement:
715 t light; 732 t standard; 800 t normal; 854 t full load

Dimensions: Length overall / water x beam x draught
160.00 ft / 160.00 ft x 20.00 ft (Bulges 24.00 ft) x 10.00 ft (normal load)
48.77 m / 48.77 m x 6.10 m (Bulges 7.32 m) x 3.05 m

Armament:
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
2 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1937 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 1,000
7 - 17.7" / 450 mm submerged torpedo tubes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.79" / 20 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 2,168 shp / 1,618 Kw = 16.00 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 123 tons

Complement:
74 - 97

Cost:
£0.183 million / $0.732 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 3 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 60 tons, 7.5 %
Hull, fittings & equipment: 352 tons, 44.0 %
Fuel, ammunition & stores: 85 tons, 10.6 %
Miscellaneous weights: 300 tons, 37.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
112 lbs / 51 Kg = 459.4 x 0.8 " / 20 mm shells or 0.1 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.4 ft / 0.1 m
Roll period: 15.1 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: 0.729
Length to Beam Ratio: 6.67 : 1
'Natural speed' for length: 12.65 kts
Power going to wave formation at top speed: 65 %
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (20 %): 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): 187.0 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 2,632 Square feet or 244 Square metres
Displacement factor (Displacement / loading): 189 %
Structure weight / hull surface area: 97 lbs/sq ft or 472 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.64
- Longitudinal: 1.46
- Overall: 1.83
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

Operational depth - 183ft
Emergency depth - 274ft
Crush depth - 457ft

F Class, Denmark Fleet Submarine laid down 1939

Displacement:
905 t light; 927 t standard; 1,000 t normal; 1,059 t full load

Dimensions: Length overall / water x beam x draught
201.15 ft / 200.00 ft x 18.00 ft (Bulges 24.00 ft) x 14.00 ft (normal load)
61.31 m / 60.96 m x 5.49 m (Bulges 7.32 m) x 4.27 m

Armament:
1 - 3.94" / 100 mm guns in single mounts, 30.51lbs / 13.84kg shells, 1939 Model
Breech loading gun in deck mount
on centreline forward
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1939 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
2 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1939 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 31 lbs / 14 kg
Shells per gun, main battery: 100
8 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 2,029 shp / 1,514 Kw = 16.00 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 132 tons

Complement:
88 - 115

Cost:
£0.248 million / $0.992 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.4 %
Armour: 2 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 55 tons, 5.5 %
Hull, fittings & equipment: 595 tons, 59.5 %
Fuel, ammunition & stores: 95 tons, 9.5 %
Miscellaneous weights: 250 tons, 25.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
193 lbs / 87 Kg = 6.3 x 3.9 " / 100 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.4 ft / 0.1 m
Roll period: 16.4 seconds
Steadiness - As gun platform (Average = 50 %): 6 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.02

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.521
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 14.14 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 2.00 ft / 0.61 m
- Forecastle (20 %): 2.00 ft / 0.61 m
- Mid (50 %): 1.00 ft / 0.30 m (0.00 ft / 0.00 m aft of break)
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.85 ft / 0.26 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 163.6 %
- Above water (accommodation/working, high = better): 3.7 %
Waterplane Area: 2,445 Square feet or 227 Square metres
Displacement factor (Displacement / loading): 255 %
Structure weight / hull surface area: 133 lbs/sq ft or 647 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.09
- Longitudinal: 2.77
- Overall: 3.05
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

Operational Depth - 305 ft
Emergency Depth - 488 ft
Crush Depth - 763 ft