WesWorld

Lossen Class Minelayer laid down 1910

Vessels-
K.D.M. Lossen
K.D.M. Havmanden
K.D.M. Havfruen
K.D.M. Hjaelperen
K.D.M. Luske
K.D.M. Nomade


Displacement:
637 t light; 653 t standard; 688 t normal; 714 t full load
Loading submergence 86 tons/feet

Dimensions:
160.00 ft x 30.00 ft x 10.00 ft (normal load)
48.77 m x 9.14 m x 3.05 m

Armament:
2 - 3.00" / 76 mm guns
Weight of broadside 27 lbs / 12 kg

Armour:
Main gun shields 0.50" / 13 mm

Machinery:
Coal fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 797 ihp / 595 Kw = 13.00 kts
Range 2,500nm at 8.00 kts

Complement:
67 - 87

Cost:
£0.043 million / $0.173 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.5 %
Armour: 1 tons, 0.1 %
Belts: 0 tons, 0.0 %, Armament: 1 tons, 0.1 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 130 tons, 18.8 %
Hull, fittings & equipment: 204 tons, 29.6 %
Fuel, ammunition & stores: 51 tons, 7.4 %
Miscellaneous weights: 300 tons, 43.6 %

Metacentric height 1.0

Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is adequate
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.11
Shellfire needed to sink: 720 lbs / 327 Kg = 53.3 x 3.0 " / 76 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: 30 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.04
Relative quality as seaboat: 1.20

Hull form characteristics:
Block coefficient: 0.502
Sharpness coefficient: 0.41
Hull speed coefficient 'M': 5.54
'Natural speed' for length: 12.65 kts
Power going to wave formation at top speed: 50 %
Trim: 15
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 112.3 %
Relative accommodation and working space: 103.2 %
(Average = 100%)
Displacement factor: 117 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.84
(Structure weight / hull surface area: 38 lbs / square foot or 186 Kg / square metre)
Relative longitudinal hull strength: 4.69
(for 12.00 ft / 3.66 m average freeboard, freeboard adjustment 3.13 ft)
Relative composite hull strength: 1.00


They each carry 150 to180 mines.

Insect Class Mine Warfare Vessel laid down 1923

Vessels-
K.D.M. Humelbi
K.D.M. Hveps
K.D.M. Gedehams


Displacement:
760 t light; 789 t standard; 910 t normal; 1,003 t full load
Loading submergence 116 tons/feet

Dimensions:
240.00 ft x 28.00 ft x 10.00 ft (normal load)
73.15 m x 8.53 m x 3.05 m

Armament:
2 - 4.72" / 120 mm guns
4 - 2.24" / 57 mm AA guns
8 - 0.51" / 13 mm guns
Weight of broadside 129 lbs / 58 kg

Armour:
Main gun shields 1.00" / 25 mm, AA gun shields 0.50" / 13 mm, Light gun shields 0.50" / 13 mm
Conning tower 0.50" / 13 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,922 shp / 6,656 Kw = 24.00 kts
Range 6,000nm at 12.00 kts

Complement:
82 - 107

Cost:
£0.238 million / $0.952 million

Distribution of weights at normal displacement:
Armament: 16 tons, 1.8 %
Armour: 5 tons, 0.6 %
Belts: 0 tons, 0.0 %, Armament: 4 tons, 0.5 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 1 tons, 0.1 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 298 tons, 32.8 %
Hull, fittings & equipment: 341 tons, 37.4 %
Fuel, ammunition & stores: 150 tons, 16.5 %
Miscellaneous weights: 100 tons, 11.0 %

Metacentric height 0.8

Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.01
Shellfire needed to sink: 636 lbs / 288 Kg = 12.1 x 4.7 " / 120 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: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.25
Relative quality as seaboat: 1.01

Hull form characteristics:
Block coefficient: 0.474
Sharpness coefficient: 0.34
Hull speed coefficient 'M': 7.57
'Natural speed' for length: 15.49 kts
Power going to wave formation at top speed: 64 %
Trim: 69
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 131.7 %
Relative accommodation and working space: 105.1 %
(Average = 100%)
Displacement factor: 110 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.91
(Structure weight / hull surface area: 46 lbs / square foot or 223 Kg / square metre)
Relative longitudinal hull strength: 2.32
(for 11.10 ft / 3.38 m average freeboard, freeboard adjustment 1.72 ft)
Relative composite hull strength: 1.00

The "Insect" class of mine warfare vesselsare capabale of placing and clearing minefields, and carry 100 mines.

Humelbi II, Denmark Mine Warfare Vessel laid down 1930

K.D.M. Myre
K.D.M. Bi
K.D.M. Bille
K.D.M. Sommerfugl
K.D.M. Kalorm
K.D.M. Tusindben
K.D.M. Guldsmed
K.D.M. Regnorm

Displacement:
800 t light; 828 t standard; 981 t normal; 1,103 t full load

Dimensions: Length overall / water x beam x draught
266.24 ft / 255.00 ft x 28.00 ft x 11.00 ft (normal load)
81.15 m / 77.72 m x 8.53 m x 3.35 m

Armament:
2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1927 Model
Quick firing guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1928 Model
Dual purpose guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.98" / 25.0 mm guns (4x2 guns), 0.48lbs / 0.22kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 132 lbs / 60 kg
Shells per gun, main battery: 100

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm -
2nd: 0.79" / 20 mm 0.79" / 20 mm -
3rd: 0.79" / 20 mm 0.79" / 20 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,790 shp / 6,557 Kw = 24.00 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 275 tons

Complement:
86 - 113

Cost:
£0.331 million / $1.324 million

Distribution of weights at normal displacement:
Armament: 16 tons, 1.7 %
Armour: 19 tons, 1.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 17 tons, 1.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 266 tons, 27.2 %
Hull, fittings & equipment: 399 tons, 40.7 %
Fuel, ammunition & stores: 180 tons, 18.4 %
Miscellaneous weights: 100 tons, 10.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
968 lbs / 439 Kg = 18.4 x 4.7 " / 120 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.8 ft / 0.2 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.41
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.437
Length to Beam Ratio: 9.11 : 1
'Natural speed' for length: 15.97 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 59
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.00 ft / 4.88 m
- Forecastle (20 %): 16.00 ft / 4.88 m
- Mid (50 %): 15.00 ft / 4.57 m (7.00 ft / 2.13 m aft of break)
- Quarterdeck (15 %): 7.00 ft / 2.13 m
- Stern: 7.00 ft / 2.13 m
- Average freeboard: 11.35 ft / 3.46 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 112.0 %
- Above water (accommodation/working, high = better): 109.0 %
Waterplane Area: 4,507 Square feet or 419 Square metres
Displacement factor (Displacement / loading): 125 %
Structure weight / hull surface area: 46 lbs/sq ft or 224 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.09
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

Humelbi II is the next generation of the sucessful "Insect" class of mine warfare vessels, capable of placing and clearing minefields.