WesWorld

Humelbi II, Denmark Mine Warfare Vessel laid down 1930

Displacement:
796 t light; 827 t standard; 980 t normal; 1,102 t full load

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

Armament:
2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1923 Model
Quick firing guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1928 Model
Dual purpose guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1930 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 130 lbs / 59 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.98" / 25 mm -
3rd: 0.79" / 20 mm 0.79" / 20 mm -
4th: 0.79" / 20 mm 0.79" / 20 mm -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,785 shp / 6,553 Kw = 24.00 kts
Range 8,000nm at 12.00 kts
Bunker at max displacement = 275 tons

Complement:
86 - 113

Cost:
£0.329 million / $1.318 million

Distribution of weights at normal displacement:
Armament: 16 tons, 1.7 %
Armour: 17 tons, 1.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 15 tons, 1.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 266 tons, 27.2 %
Hull, fittings & equipment: 397 tons, 40.5 %
Fuel, ammunition & stores: 184 tons, 18.8 %
Miscellaneous weights: 100 tons, 10.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
969 lbs / 440 Kg = 18.4 x 4.7 " / 120 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.8 ft / 0.2 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.40
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): 58
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: 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): 112.3 %
- Above water (accommodation/working, high = better): 109.0 %
Waterplane Area: 4,507 Square feet or 419 Square metres
Displacement factor (Displacement / loading): 126 %
Structure weight / hull surface area: 46 lbs/sq ft or 223 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
Good seaboat, rides out heavy weather easily

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

Make her with a raised forecastle instead of the flush deck at the moment. Much bettter seakeeping.

???

She has a rise forward of the mid point, and a seaboat rating of 1.20.

Wouldn't a raised forecastle add weight and require a superfiring for'ard gun?

Good point. Just ignore me. It seems that I can't read any more.