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Humelbi(b), Denmark Mine Warfare Vessel laid down 1923

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

Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.02

Shellfire needed to sink: 638 lbs / 289 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: 69 %

(Average = 50 %)

Relative rocking effect from firing to beam: 0.24

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: 68

(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

K.D.M. Humelbi is the first vessel of the "Insect" class of mine warfare vessels, capabale of placing and clearing minefields.

I can't remember what we figured the weight of an individual mine would be, anyone recall?

She is a rather nice looking ship.

Best example of a flared hull is HMS Vanguard. Look at her hull forward and notice that it sharply rises.

On this ship, she has flare both fore and aft. Flare increases seakeeping qualities.

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