WesWorld

Repository for data pertaining to the subject. Includes information on patrol boats, motor torpedo boats, subchasers, etc.

(Historical data)

S-1 , Peru Submarine Chaser laid down 1934

S-1 to S-6 planned for 1934

Displacement: 285 t light; 299 t standard; 330 t normal; 355 t full load

Dimensions: Length overall / water x beam x draught
210.00 ft / 210.00 ft x 20.00 ft x 5.00 ft (normal load)
64.01 m / 64.01 m x 6.10 m x 1.52 m

Armament:
1 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1934 Model
Quick firing gun in a deck mount with hoist
on centreline forward
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on centreline, all aft, 1 raised mount
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 24 lbs / 11 kg
Shells per gun, main battery: 500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.59" / 15 mm 0.79" / 20 mm
2nd: 0.79" / 20 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 2,418 shp / 1,804 Kw = 20.00 kts
Range 3,000nm at 12.00 kts
Bunker at max displacement = 55 tons

Complement:
38 - 50

Cost:
£0.109 million / $0.437 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.9 %
Armour: 2 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 70 tons, 21.1 %
Hull, fittings & equipment: 180 tons, 54.5 %
Fuel, ammunition & stores: 45 tons, 13.6 %
Miscellaneous weights: 30 tons, 9.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
567 lbs / 257 Kg = 27.3 x 3.5 " / 88 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 57 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 1.15

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 10.50 : 1
'Natural speed' for length: 14.49 kts
Power going to wave formation at top speed: 56 %
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: 11.50 ft / 3.51 m
- Forecastle (20 %): 9.00 ft / 2.74 m
- Mid (60 %): 7.00 ft / 2.13 m
- Quarterdeck (15 %): 7.00 ft / 2.13 m
- Stern: 8.00 ft / 2.44 m
- Average freeboard: 8.08 ft / 2.46 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 87.8 %
- Above water (accommodation/working, high = better): 108.5 %
Waterplane Area: 2,843 Square feet or 264 Square metres
Displacement factor (Displacement / loading): 168 %
Structure weight / hull surface area: 37 lbs/sq ft or 178 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.16
- Longitudinal: 2.24
- Overall: 1.24
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate

(Historical data)

S-7, laid down 1941
S-8, laid down 1941

Displacement:
218 t light; 225 t standard; 262 t normal; 292 t full load

Dimensions: Length overall / water x beam x draught
126.58 ft / 123.03 ft x 19.69 ft x 6.89 ft (normal load)
38.58 m / 37.50 m x 6.00 m x 2.10 m

Armament:
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1941 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
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 amidships
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 800

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 1,200 shp / 895 Kw = 16.15 kts
Range 2,000nm at 15.00 kts (Bunkerage = 67 tons)

Complement:
32 - 42

Cost:
£0.077 million / $0.308 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.2 %
Armour: 1 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 32 tons, 12.1 %
Hull, fittings & equipment: 166 tons, 63.1 %
Fuel, ammunition & stores: 44 tons, 16.9 %
Miscellaneous weights: 19 tons, 7.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
754 lbs / 342 Kg = 487.6 x 1.5 " / 37 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.5 ft / 0.1 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.52

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 6.25 : 1
'Natural speed' for length: 11.09 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10.83 ft / 3.30 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 9.92 ft / 3.02 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.3 %
- Above water (accommodation/working, high = better): 99.0 %
Waterplane Area: 1,690 Square feet or 157 Square metres
Displacement factor (Displacement / loading): 301 %
Structure weight / hull surface area: 45 lbs/sq ft or 222 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.42
- Longitudinal: 16.99
- Overall: 1.83
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 class of coastal submarine chasers.

S-9, laid down 1942
S-10, laid down 1942
S-11, laid down 1942
S-12, laid down 1942
S-13, laid down 1942
S-14, laid down 1942
S-15, laid down 1942
S-16, laid down 1942
S-17, laid down 1943
S-18, laid down 1943
S-19, laid down 1943
S-20, laid down 1943
S-21, laid down 1943

Enter ship name, Enter country Enter ship type laid down 1942

Displacement:
100 t light; 105 t standard; 111 t normal; 116 t full load

Dimensions: Length overall / water x beam x draught
100.51 ft / 98.43 ft x 16.08 ft x 4.92 ft (normal load)
30.63 m / 30.00 m x 4.90 m x 1.50 m

Armament:
1 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1942 Model
Breech loading gun in deck mount
on centreline forward
1 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Breech loading gun in deck mount
on centreline aft
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 22 lbs / 10 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 988 shp / 737 Kw = 17.06 kts
Range 1,700nm at 10.00 kts (Bunkerage = 11 tons)

Complement:
16 - 22

Cost:
£0.060 million / $0.239 million

Distribution of weights at normal displacement:
Armament: 3 tons, 2.4 %
Armour: 2 tons, 1.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 1.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 26 tons, 23.2 %
Hull, fittings & equipment: 50 tons, 44.9 %
Fuel, ammunition & stores: 11 tons, 9.8 %
Miscellaneous weights: 20 tons, 18.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
135 lbs / 61 Kg = 6.5 x 3.5 " / 88 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.02
Metacentric height 0.3 ft / 0.1 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.26
Seaboat quality (Average = 1.00): 1.12

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 6.12 : 1
'Natural speed' for length: 9.92 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.81 ft / 3.60 m
- Forecastle (20 %): 7.87 ft / 2.40 m
- Mid (50 %): 7.87 ft / 2.40 m
- Quarterdeck (15 %): 7.87 ft / 2.40 m
- Stern: 7.87 ft / 2.40 m
- Average freeboard: 8.19 ft / 2.50 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 114.2 %
- Above water (accommodation/working, high = better): 98.8 %
Waterplane Area: 1,054 Square feet or 98 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 22 lbs/sq ft or 107 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.76
- Longitudinal: 11.99
- Overall: 1.01
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate

(Historical data)

SC24-SC25
Laid down 1944 & com. in 1945

200t-Chasser Class, Peru Sub Chasser laid down 1944

Displacement:
200 t light; 212 t standard; 266 t normal; 310 t full load

Dimensions: Length overall / water x beam x draught
143.53 ft / 137.80 ft x 22.97 ft x 6.27 ft (normal load)
43.75 m / 42.00 m x 7.00 m x 1.91 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
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Quick firing guns in deck mounts
on centreline, all aft, all raised mounts - 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 43 lbs / 20 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, 1 387 shp / 1 035 Kw = 18.00 kts
Range 4 000nm at 15.00 kts
Bunker at max displacement = 98 tons

Complement:
32 - 42

Cost:
£0.111 million / $0.444 million

Distribution of weights at normal displacement:
Armament: 5 tons, 2.0 %
Armour: 3 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 35 tons, 13.3 %
Hull, fittings & equipment: 106 tons, 39.8 %
Fuel, ammunition & stores: 67 tons, 25.1 %
Miscellaneous weights: 50 tons, 18.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
487 lbs / 221 Kg = 13.8 x 4.1 " / 105 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.02
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.10

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.470
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 14.08 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 64
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 (50 %): 7.87 ft / 2.40 m
- Quarterdeck (18 %): 7.22 ft / 2.20 m
- Stern: 7.22 ft / 2.20 m
- Average freeboard: 9.17 ft / 2.79 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81.2 %
- Above water (accommodation/working, high = better): 107.9 %
Waterplane Area: 2 133 Square feet or 198 Square metres
Displacement factor (Displacement / loading): 160 %
Structure weight / hull surface area: 29 lbs/sq ft or 143 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.19
- 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

10 tons Asdic +
30 tons for 90 DC
10 tons reserve

(Historical data)

A basic armed patrol boat for harbour defence, inspection of merchant ships, etc. Basically a near-copy of the historical British ML1 motor launch.

Light Displacement: 34 t
Armament: 1 x 37mm, 2 x MG, 6 x DC
Speed: 20 kts

B-1 to B-2: laid down 1941
B-3 to B-4: laid down 1941
B-5 to B-6: fabricated 1941, assembled 1941
B-7 to B-9: laid down 1942
B-11 to B-13: laid down 1942
B-14 to B-16: laid down 1942
B-18 to B-20: laid down 1942
B-21 to B-26: laid down 1943

(Historical data)

A larger patrol vessel designed for operations on Lake Titicaca.

B-10, laid down 1942
B-17, laid down 1942

Enter ship name, Enter country Enter ship type laid down 1942

Displacement:
98 t light; 102 t standard; 104 t normal; 106 t full load

Dimensions: Length overall / water x beam x draught
116.35 ft / 112.86 ft x 16.40 ft x 3.28 ft (normal load)
35.46 m / 34.40 m x 5.00 m x 1.00 m

Armament:
1 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1942 Model
Breech loading gun in deck mount
on centreline forward
1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1942 Model
Anti-aircraft gun in deck mount
on centreline aft
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 23 lbs / 10 kg
Shells per gun, main battery: 100

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Coal and oil fired boilers, steam turbines,
Geared drive, 2 shafts, 297 shp / 222 Kw = 13.01 kts
Range 500nm at 10.00 kts (Bunkerage = 4 tons)

Complement:
16 - 21

Cost:
£0.044 million / $0.178 million

Distribution of weights at normal displacement:
Armament: 3 tons, 2.7 %
Armour: 2 tons, 2.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 1.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.4 %
Machinery: 8 tons, 7.8 %
Hull, fittings & equipment: 47 tons, 45.2 %
Fuel, ammunition & stores: 6 tons, 5.6 %
Miscellaneous weights: 38 tons, 36.5 %
-10 t: ASDIC
-10 t: Depth charges and throwers
-18 t: Weight reserve/deck cargo/short-term troop embarkment

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
220 lbs / 100 Kg = 10.6 x 3.5 " / 88 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.4 ft / 0.1 m
Roll period: 10.8 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.21
Seaboat quality (Average = 1.00): 1.58

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 6.88 : 1
'Natural speed' for length: 10.62 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 32
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10.50 ft / 3.20 m
- Forecastle (20 %): 6.56 ft / 2.00 m
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 6.88 ft / 2.10 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 85.9 %
- Above water (accommodation/working, high = better): 105.8 %
Waterplane Area: 1,354 Square feet or 126 Square metres
Displacement factor (Displacement / loading): 131 %
Structure weight / hull surface area: 21 lbs/sq ft or 102 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 4.16
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

(Historical data)

An experimental series of motor torpedo boats ordered for evaluation as coastal defence units. Basically a near-copy of the historical British Vosper Type 1 MTB.

M-1 to M-2, built 1941
M-3 to M-4, built 1942
M-5 to M-8, built 1944

Displacement: 47 t
Armament: 1 x 20mm, 2 x MG, 4 x 450mm TT
Speed: 40 kts
Range: 470 nm @ 20 kts
Crew: 13

(Construction data is the best I can extrapolate from the information available)