WesWorld

Repository for data pertaining to the subject.

(Historical data)

A-1, laid down 1941
A-2, laid down 1941

Displacement: 500 t light; 517 t standard; 551 t normal; 578 t full load

Dimensions: Length overall / water x beam x draught
167.67 ft / 161.09 ft x 26.25 ft x 9.12 ft (normal load)
51.11 m / 49.10 m x 8.00 m x 2.78 m

Armament:

1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1941 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all aft
Weight of broadside 39 lbs / 18 kg
Shells per gun, main battery: 250

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 1,400 shp / 1,044 Kw = 15.57 kts
Range 4,000nm at 10.00 kts (Bunkerage = 62 tons)

Complement: 56 - 73

Cost: £0.165 million / $0.662 million

Distribution of weights at normal displacement:

Armament: 5 tons, 0.9 %
Armour: 3 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 37 tons, 6.7 %
Hull, fittings & equipment: 371 tons, 67.4 %
Fuel, ammunition & stores: 51 tons, 9.3 %
Miscellaneous weights: 84 tons, 15.2 %
--10 t: Depth Charges
--50 t: Sweeping stuff
--24 t: Weight reserve

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,610 lbs / 730 Kg = 45.6 x 4.1 " / 105 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.500
Length to Beam Ratio: 6.14 : 1
'Natural speed' for length: 12.69 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.70 ft / 5.70 m
- Forecastle (20 %): 15.75 ft / 4.80 m
- Mid (50 %): 15.75 ft / 4.80 m (7.87 ft / 2.40 m aft of break)
- Quarterdeck (15 %): 7.87 ft / 2.40 m
- Stern: 7.87 ft / 2.40 m
- Average freeboard: 12.05 ft / 3.67 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 46.9 %
- Above water (accommodation/working, high = better): 110.3 %
Waterplane Area: 2,817 Square feet or 262 Square metres
Displacement factor (Displacement / loading): 276 %
Structure weight / hull surface area: 65 lbs/sq ft or 318 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.58
- Longitudinal: 14.59
- Overall: 1.97
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

(Historical data)

A-3, laid down 1942
A-4, laid down 1942
A-5, laid down 1942
A-6, laid down 1942
A-7, laid down 1943
A-8, laid down 1943

A-3 class minesweeper, laid down 1941

Displacement: 396 t light; 417 t standard; 515 t normal; 594 t full load

Dimensions: Length overall / water x beam x draught
167.67 ft / 161.09 ft x 26.25 ft x 8.20 ft (normal load)
51.11 m / 49.10 m x 8.00 m x 2.50 m

Armament:

2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1941 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 1 raised mount
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all aft
Weight of broadside 76 lbs / 34 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 3,000 shp / 2,238 Kw = 18.81 kts
Range 4,000nm at 15.00 kts (Bunkerage = 176 tons)

Complement: 53 - 70

Cost: £0.203 million / $0.814 million

Distribution of weights at normal displacement:
Armament: 9 tons, 1.8 %
Armour: 5 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 79 tons, 15.4 %
Hull, fittings & equipment: 218 tons, 42.3 %
Fuel, ammunition & stores: 119 tons, 23.2 %
Miscellaneous weights: 84 tons, 16.3 %
-50 t: Boom for minesweeping/salvage/target-towing
-14 t: Weight reserve
-10 t: Depth charges and throwers
-10 t: ASDIC

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
921 lbs / 418 Kg = 26.1 x 4.1 " / 105 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.8 ft / 0.2 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.37
Seaboat quality (Average = 1.00): 1.41

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.520
Length to Beam Ratio: 6.14 : 1
'Natural speed' for length: 12.69 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.70 ft / 5.70 m
- Forecastle (20 %): 15.75 ft / 4.80 m
- Mid (50 %): 15.75 ft / 4.80 m (7.87 ft / 2.40 m aft of break)
- Quarterdeck (15 %): 7.87 ft / 2.40 m
- Stern: 7.87 ft / 2.40 m
- Average freeboard: 12.05 ft / 3.67 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.4 %
- Above water (accommodation/working, high = better): 118.7 %
Waterplane Area: 2,869 Square feet or 267 Square metres
Displacement factor (Displacement / loading): 159 %
Structure weight / hull surface area: 39 lbs/sq ft or 188 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 8.06
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

(Historical data)

MS-5, laid down 1944
MS-6, laid down 1944
MS-7, laid down 1944
MS-8, laid down 1944

200t-Minesweeper, Peru Mineswweper laid down 1944

Displacement: 200 t light; 211 t standard; 265 t normal; 307 t full load

Dimensions: Length overall / water x beam x draught
150.09 ft / 144.36 ft x 22.31 ft x 6.12 ft (normal load)
45.75 m / 44.00 m x 6.80 m x 1.87 m

Armament:

1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1944 Model
Quick firing gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.48lbs / 0.22kg shells, 1944 Model
Machine guns in deck mount
on centreline forward, all raised guns - superfiring
4 - 0.98" / 25.0 mm guns (2x2 guns), 0.48lbs / 0.22kg shells, 1944 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 38 lbs / 17 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm - -
2nd: 0.59" / 15 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 1 173 shp / 875 Kw = 17.38 kts
Range 4 000nm at 15.00 kts
Bunker at max displacement = 96 tons

Complement:
32 - 42

Cost:
£0.102 million / $0.409 million

Distribution of weights at normal displacement:
Armament: 5 tons, 1.8 %
Armour: 1 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 30 tons, 11.3 %
Hull, fittings & equipment: 104 tons, 39.2 %
Fuel, ammunition & stores: 65 tons, 24.4 %
Miscellaneous weights: 60 tons, 22.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
507 lbs / 230 Kg = 14.3 x 4.1 " / 105 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.15
Seaboat quality (Average = 1.00): 1.27

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.470
Length to Beam Ratio: 6.47 : 1
'Natural speed' for length: 14.30 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.75 ft / 4.80 m
- Forecastle (20 %): 11.15 ft / 3.40 m
- Mid (35 %): 7.87 ft / 2.40 m
- Quarterdeck (18 %): 7.22 ft / 2.20 m
- Stern: 7.22 ft / 2.20 m
- Average freeboard: 8.87 ft / 2.70 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76.9 %
- Above water (accommodation/working, high = better): 103.7 %
Waterplane Area: 2 171 Square feet or 202 Square metres
Displacement factor (Displacement / loading): 166 %
Structure weight / hull surface area: 28 lbs/sq ft or 138 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.40
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

10 tons Asdic +
30 tons for paravanes & sweeping stuff
10 tons for 30 DC
10 tons reserve