WesWorld

1916, Frigate-A Class

Ships in class; FA01, FA02, FA03, FA04, FA05




FA-1 , Italian Frigate laid down 1916

Displacement:
820 t light; 843 t standard; 922 t normal; 982 t full load
Loading submergence 119 tons/feet

Dimensions:
223.10 ft x 26.25 ft x 9.19 ft (normal load)
68.00 m x 8.00 m x 2.80 m

Armament:
2 - 100mm / 45 guns in 2 single mounts
8 - 20mm cannons
Weight of broadside 63 lbs / 29 kg
75tons of depth charges

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10,000 shp / 7,530 Kw = 24.00 kts
Range 5,000nm at 10.00 kts

Complement:
83 - 108

Cost:
£0.144 million / $0.576 million

Distribution of weights at normal displacement:
Armament: 8 tons, 0.9 %
Machinery: 376 tons, 40.8 %
Hull, fittings & equipment: 361 tons, 39.1 %
Fuel, ammunition & stores: 103 tons, 11.1 %
Miscellaneous weights: 75 tons, 8.1 %

Metacentric height 0.9

Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is excellent
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.14
Shellfire needed to sink: 704 lbs / 319 Kg = 23.1 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.3
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 63 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.18
Relative quality as seaboat: 1.75

Hull form characteristics:
Block coefficient: 0.600
Sharpness coefficient: 0.38
Hull speed coefficient 'M': 7.00
'Natural speed' for length: 14.94 kts
Power going to wave formation at top speed: 70 %
Trim: 36
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 147.4 %
Relative accommodation and working space: 156.5 %
(Average = 100%)
Displacement factor: 104 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.86
(Structure weight / hull surface area: 44 lbs / square foot or 213 Kg / square metre)
Relative longitudinal hull strength: 4.27
(for 16.40 ft / 5.00 m average freeboard, freeboard adjustment 7.00 ft)
Relative composite hull strength: 1.01

1917, Guardino (FB) Class

Ships in class; FB01, FB02, FB03, FB04, FB05, FB06, FB07, FB08, FB09, FB10

All vessels sold to China 1940



Guardino , Italian Frigate laid down 1917

Displacement:
1,063 t light; 1,094 t standard; 1,240 t normal; 1,351 t full load
Loading submergence 149 tons/feet

Dimensions:
246.06 ft x 29.86 ft x 9.84 ft (normal load)
75.00 m x 9.10 m x 3.00 m

Armament:
6 - 3" / 40 guns in 6 single mounts
2 - 20mm AA guns
Weight of broadside 81 lbs / 37 kg
190tons of depth charges

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 11,600 shp / 8,635 Kw = 24.00 kts
Range 8,000nm at 10.00 kts

Complement:
104 - 135

Cost:
£0.191 million / $0.765 million

Distribution of weights at normal displacement:
Armament: 10 tons, 0.8 %
Machinery: 424 tons, 34.2 %
Hull, fittings & equipment: 438 tons, 35.4 %
Fuel, ammunition & stores: 177 tons, 14.3 %
Miscellaneous weights: 190 tons, 15.3 %

Metacentric height 0.9

Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.07
Shellfire needed to sink: 993 lbs / 451 Kg = 73.6 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: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.15
Relative quality as seaboat: 1.34

Hull form characteristics:
Block coefficient: 0.600
Sharpness coefficient: 0.39
Hull speed coefficient 'M': 7.00
'Natural speed' for length: 15.69 kts
Power going to wave formation at top speed: 68 %
Trim: 52
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 133.9 %
Relative accommodation and working space: 141.1 %
(Average = 100%)
Displacement factor: 111 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.89
(Structure weight / hull surface area: 47 lbs / square foot or 228 Kg / square metre)
Relative longitudinal hull strength: 2.94
(for 14.76 ft / 4.50 m average freeboard, freeboard adjustment 4.79 ft)
Relative composite hull strength: 1.00

1923, FL Class

Ships in class; FL01, FL02, FL03, FL04, FL05



FL23, Italian Torpedo boat laid down 1923

Displacement:
501 t light; 514 t standard; 543 t normal; 565 t full load
Loading submergence 75 tons/feet

Dimensions:
223.10 ft x 21.65 ft x 9.84 ft (normal load)
68.00 m x 6.60 m x 3.00 m

Armament:
2 - 3" / 60 guns in 2 single mounts
6 - 20 mm cannon in duple mounts
2 - 13.7 mm machine guns in flexible mountings
6 - 450 mm above water torpedoes in 2 triple mounts
10tons of depth charges/extra stores


Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 26,800 shp / 19,993 Kw = 33.60 kts
Range 3,000nm at 10.00 kts
Caution: Delicate, lightweight machinery

Complement:
56 - 73

Cost:
£0.185 million / $0.739 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.6 %
Machinery: 308 tons, 56.7 %
Hull, fittings & equipment: 180 tons, 33.1 %
Fuel, ammunition & stores: 42 tons, 7.8 %
Miscellaneous weights: 10 tons, 1.8 %

Metacentric height 0.5

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is extremely poor
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.02
Shellfire needed to sink: 126 lbs / 57 Kg = 9.3 x 3.0 " / 76 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 51 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.13
Relative quality as seaboat: 0.80

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.29
Hull speed coefficient 'M': 8.35
'Natural speed' for length: 14.94 kts
Power going to wave formation at top speed: 76 %
Trim: 63
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 189.6 %
Relative accommodation and working space: 43.3 %
(Average = 100%)
Displacement factor: 30 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.51
(Structure weight / hull surface area: 29 lbs / square foot or 142 Kg / square metre)
Relative longitudinal hull strength: 2.74
(for 12.47 ft / 3.80 m average freeboard, freeboard adjustment 4.01 ft)
Relative composite hull strength: 0.61

1926, Spica Class Torpedo Boat

Ships in class;

Airone, Alcione, Aldebaran, Altair Laid down 1926

Andromeda, Antares, Aretusa, Ariel, Astore, Calipso, Calliope, Canopo, Cassiopea, Castore, Centauro, Cigno, Circe, Climene, Clio, Libra Laid down 1927

Lince, Lira, Lupo, Pallade, Pleiadi, , Sagittario, Sirio, Spica Laid down 1928




RM Spica, Italian Torpedo Boat laid down 1926

Displacement:
599 t light; 621 t standard; 678 t normal; 721 t full load
Loading submergence 93 tons/feet

Dimensions:
262.47 ft x 22.97 ft x 9.84 ft (normal load)
80.00 m x 7.00 m x 3.00 m

Armament:
3 - 3.94" / 100 mm guns
4 - 1.46" / 37 mm guns
6 - 0.79" / 20 mm AA guns
Weight of broadside 99 lbs / 45 kg
4 - 21.0" / 533 mm above water torpedoes

Armour:
Main gun shields 0.79" / 20 mm, 2nd gun shields 0.39" / 10 mm
Conning tower 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 28,000 shp / 20,888 Kw = 33.85 kts
Range 2,000nm at 15.00 kts

Complement:
66 - 86

Cost:
£0.286 million / $1.142 million

Distribution of weights at normal displacement:
Armament: 12 tons, 1.8 %
Armour: 8 tons, 1.1 %
Belts: 0 tons, 0.0 %, Armament: 3 tons, 0.5 %, Armour Deck: 0 tons, 0.0 %
Conning Tower: 5 tons, 0.7 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 366 tons, 54.0 %
Hull, fittings & equipment: 203 tons, 29.9 %
Fuel, ammunition & stores: 79 tons, 11.7 %
Miscellaneous weights: 10 tons, 1.5 %

Metacentric height 0.6

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is cramped
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.08
Shellfire needed to sink: 137 lbs / 62 Kg = 4.5 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 50 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.31
Relative quality as seaboat: 0.74

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.28
Hull speed coefficient 'M': 9.13
'Natural speed' for length: 16.20 kts
Power going to wave formation at top speed: 72 %
Trim: 68
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 189.8 %
Relative accommodation and working space: 57.1 %
(Average = 100%)
Displacement factor: 36 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight / hull surface area: 29 lbs / square foot or 139 Kg / square metre)
Relative longitudinal hull strength: 1.50
(for 11.15 ft / 3.40 m average freeboard, freeboard adjustment 2.31 ft)
Relative composite hull strength: 0.55

Vespa Class, Corvetta Cacciasommergibili

Ships in Class ; Vespa, Maggiolino, Lucciola, Libellula

Vespa, Italian Frigate laid down 1930

Displacement:
1,000 t light; 1,065 t standard; 1,453 t normal; 1,763 t full load

Dimensions: Length overall / water x beam x draught
272.91 ft / 262.47 ft x 32.81 ft x 9.84 ft (normal load)
83.18 m / 80.00 m x 10.00 m x 3.00 m

Armament:
4 - 100mm / 47 guns (2x2 guns), 33.07lbs / 15.00kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
10 - 0.98" / 25.0 mm guns ( 10 mounts), 0.52lbs / 0.24kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 139 lbs / 63 kg
Shells per gun, main battery: 450

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

- Conning tower: 0.79" / 20 mm

Machinery:
Oil fired boilers, steam turbines plus batteries,
Electric motors, 2 shafts, 6,000 shp / 4,476 Kw = 20.16 kts ( Electric "creeping" motors)
Range 3,850nm at 20.00 kts
Bunker at max displacement = 698 tons

Complement:
116 - 152

Cost:
£0.309 million / $1.236 million

Distribution of weights at normal displacement:
Armament: 16 tons, 1.1 %
Armour: 8 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.1 %
Machinery: 182 tons, 12.5 %
Hull, fittings & equipment: 724 tons, 49.8 %
Fuel, ammunition & stores: 453 tons, 31.2 %
Miscellaneous weights: 70 tons, 4.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,267 lbs / 1,936 Kg = 139.9 x 3.9 " / 100 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 1.4 ft / 0.4 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.95

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 16.20 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 39
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (50 %): 16.40 ft / 5.00 m
- Quarterdeck (25 %): 8.20 ft / 2.50 m (16.40 ft / 5.00 m before break)
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 14.62 ft / 4.46 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 57.3 %
- Above water (accommodation/working, high = better): 169.6 %
Waterplane Area: 6,298 Square feet or 585 Square metres
Displacement factor (Displacement / loading): 255 %
Structure weight / hull surface area: 62 lbs/sq ft or 303 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.16
- Longitudinal: 5.31
- Overall: 1.35
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

10 tons for 10x25mm single mounts

8 tons for 8x25mm single mounts
40 tons for main ASW weapon
20tons for towed torpedoes + depth charges

20 trawlers converted to this standard

Berta, Italian Corvetta Cacciasommergibili refitted 1932 (Engine 1920)

Displacement:
600 t light; 618 t standard; 751 t normal; 857 t full load

Dimensions: Length overall / water x beam x draught
213.26 ft / 203.41 ft x 32.81 ft x 6.56 ft (normal load)
65.00 m / 62.00 m x 10.00 m x 2.00 m

Armament:
1 - 2.56" / 65.0 mm guns in single mounts, 8.82lbs / 4.00kg shells, 1932 Model
Quick firing gun in deck mount
on centreline forward, 1 raised gun
4 - 1.46" / 37.0 mm guns (1x4 guns), 1.83lbs / 0.83kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline aft
Weight of broadside 16 lbs / 7 kg
Shells per gun, main battery: 200

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 750 ihp / 560 Kw = 12.65 kts
Range 8,050nm at 10.00 kts
Bunker at max displacement = 240 tons

Complement:
71 - 93

Cost:
£0.130 million / $0.522 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.2 %
Machinery: 44 tons, 5.9 %
Hull, fittings & equipment: 494 tons, 65.9 %
Fuel, ammunition & stores: 150 tons, 20.0 %
Miscellaneous weights: 60 tons, 8.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,137 lbs / 1,876 Kg = 493.7 x 2.6 " / 65 mm shells or 2.6 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 6.20 : 1
'Natural speed' for length: 14.26 kts
Power going to wave formation at top speed: 40 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 14.76 ft / 4.50 m
- Mid (60 %): 9.84 ft / 3.00 m
- Quarterdeck (15 %): 11.48 ft / 3.50 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 12.65 ft / 3.86 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 31.3 %
- Above water (accommodation/working, high = better): 152.8 %
Waterplane Area: 4,881 Square feet or 453 Square metres
Displacement factor (Displacement / loading): 462 %
Structure weight / hull surface area: 65 lbs/sq ft or 316 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.55
- Longitudinal: 6.07
- Overall: 1.78
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

=10tons for quadruple 37/54
=10tons for SONAR
=10tons for DC racks
=10tons for projectors
=20tons misc
=60tons

Units laid down in 1932

Gabbiano
Ardea
Cicogna
Cormorano
Folaga
Gru
Ibis
Marangone
Pellicano


Gabbiano, Italian Corvetta Cacciasommergibili laid down 1932

Displacement:
611 t light; 628 t standard; 728 t normal; 808 t full load

Dimensions: Length overall / water x beam x draught
207.89 ft / 196.85 ft x 28.54 ft x 8.20 ft (normal load)
63.37 m / 60.00 m x 8.70 m x 2.50 m

Armament:
1 - 3.94" / 100 mm guns in single mounts, 33.07lbs / 15.00kg shells, 1932 Model
Anti-aircraft gun in deck mount
on centreline forward
4 - 0.98" / 25.0 mm guns (2x2 guns), 0.48lbs / 0.22kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
4 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all forward
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 100
2 - 17.7" / 450 mm above water torpedoes

Machinery:
Diesel Internal combustion motors,
Electric cruising motors plus geared drives, 2 shafts, 4,000 shp / 2,984 Kw = 19.62 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 180 tons

Complement:
69 - 91

Cost:
£0.189 million / $0.755 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.6 %
Machinery: 118 tons, 16.2 %
Hull, fittings & equipment: 450 tons, 61.8 %
Fuel, ammunition & stores: 117 tons, 16.1 %
Miscellaneous weights: 39 tons, 5.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,897 lbs / 860 Kg = 62.2 x 3.9 " / 100 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.75

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.553
Length to Beam Ratio: 6.90 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (60 %): 16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 14.04 ft / 4.28 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 63.9 %
- Above water (accommodation/working, high = better): 123.2 %
Waterplane Area: 3,932 Square feet or 365 Square metres
Displacement factor (Displacement / loading): 235 %
Structure weight / hull surface area: 56 lbs/sq ft or 274 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.25
- Longitudinal: 11.30
- Overall: 1.55
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

10t D2bis Sonar
2t torpedoes
6t 2xduple 25mm mounts
7t = Scaricabombe
4t = 40 DC + throwers
10t = ASW mortar

4 Ships laid down 1933,
Diana, Orsa, Pegaso, Orione


Diana, Italian Avviso Veloce laid down 1933

Displacement:
1,538 t light; 1,646 t standard; 2,331 t normal; 2,879 t full load

Dimensions: Length overall / water x beam x draught
375.52 ft / 360.89 ft x 39.37 ft x 11.48 ft (normal load)
114.46 m / 110.00 m x 12.00 m x 3.50 m

Armament:
4 - 5.31" / 135 mm guns (2x2 guns), 79.37lbs / 36.00kg shells, 1933 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 1.85" / 47.0 mm guns (1x4 guns), 3.86lbs / 1.75kg shells, 1933 Model
Anti-aircraft guns in deck mount
on centreline aft
24 - 0.98" / 25.0 mm guns (6x4 guns), 0.53lbs / 0.24kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 346 lbs / 157 kg
Shells per gun, main battery: 300
4 - 17.7" / 450 mm above water torpedoes

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

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,000 shp / 5,968 Kw = 21.75 kts
Range 14,200nm at 15.00 kts
Bunker at max displacement = 1,233 tons

Complement:
167 - 218

Cost:
£0.570 million / $2.279 million

Distribution of weights at normal displacement:
Armament: 41 tons, 1.7 %
Armour: 13 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 10 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.1 %
Machinery: 233 tons, 10.0 %
Hull, fittings & equipment: 1,192 tons, 51.1 %
Fuel, ammunition & stores: 793 tons, 34.0 %
Miscellaneous weights: 60 tons, 2.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,939 lbs / 3,601 Kg = 105.8 x 5.3 " / 135 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 1.8 ft / 0.5 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has raised forecastle, low quarterdeck
and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 21.83 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.17 ft / 9.50 m
- Forecastle (20 %): 22.97 ft / 7.00 m (18.04 ft / 5.50 m aft of break)
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (13 %): 9.84 ft / 3.00 m (18.04 ft / 5.50 m before break)
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 18.62 ft / 5.68 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 51.4 %
- Above water (accommodation/working, high = better): 174.6 %
Waterplane Area: 9,845 Square feet or 915 Square metres
Displacement factor (Displacement / loading): 270 %
Structure weight / hull surface area: 62 lbs/sq ft or 303 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 4.70
- Overall: 1.05
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

15t = quad 47mm
9t=sonar
7t=scaricabombe
10t=asw mortar + 6ton reloads
250hp creeping motors = 9t 28hp/ton
4t = 4x450mm silurotto
=60t

Speed with electric motors = 8 knts

1935 Pattern Escort Vessel

Coastal escort and freighter

20 units laid down 1935

D1 - D20

Italian Corvetta Cacciasommergibili laid down 1935

Displacement:
1,434 t light; 1,480 t standard; 1,729 t normal; 1,928 t full load

Dimensions: Length overall / water x beam x draught
336.46 ft / 328.08 ft x 46.85 ft x 6.56 ft (normal load)
102.55 m / 100.00 m x 14.28 m x 2.00 m

Armament:
1 - 2.56" / 65.0 mm guns in single mounts, 8.38lbs / 3.80kg shells, 1935 Model
Anti-aircraft gun in deck mount
on centreline forward
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all forward
12 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 27 lbs / 12 kg
Shells per gun, main battery: 500
2 - 17.7" / 450 mm above water torpedoes

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

- Conning tower: 1.42" / 36 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,000 shp / 5,968 Kw = 21.11 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 449 tons

Complement:
133 - 174

Cost:
£0.432 million / $1.726 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.2 %
Armour: 6 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 4 tons, 0.3 %
Machinery: 227 tons, 13.1 %
Hull, fittings & equipment: 954 tons, 55.2 %
Fuel, ammunition & stores: 295 tons, 17.1 %
Miscellaneous weights: 243 tons, 14.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,027 lbs / 3,187 Kg = 838.6 x 2.6 " / 65 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 2.2 ft / 0.7 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 7.00 : 1
'Natural speed' for length: 18.11 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 28.87 ft / 8.80 m
- Forecastle (10 %): 25.59 ft / 7.80 m (19.03 ft / 5.80 m aft of break)
- Mid (50 %): 19.03 ft / 5.80 m
- Quarterdeck (10 %): 25.59 ft / 7.80 m (19.03 ft / 5.80 m before break)
- Stern: 25.59 ft / 7.80 m
- Average freeboard: 20.47 ft / 6.24 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 61.0 %
- Above water (accommodation/working, high = better): 286.8 %
Waterplane Area: 11,242 Square feet or 1,044 Square metres
Displacement factor (Displacement / loading): 237 %
Structure weight / hull surface area: 51 lbs/sq ft or 250 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 4.85
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

10t Sonar
2t torpedoes
7t = Scaricabombe
4t = 40 DC + throwers
20t = ASW mortar + reloads
200tons cargo

C-Class Frigate

C1 to C8 Laid down 1936

Displacement:
748 t light; 813 t standard; 865 t normal; 907 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(246.20 ft / 229.66 ft) x 28.71 ft x (11.48 / 11.83 ft)
(75.04 m / 70.00 m) x 8.75 m x (3.50 / 3.61 m)

Armament:
2 - 3.94" / 100.0 mm 65.0 cal guns - 33.07lbs / 15.00kg shells, 300 per gun
Breech loading guns in deck and hoist mount, 1936 Model
1 x Twin mount on centreline forward
4 - 1.85" / 47.0 mm 60.0 cal guns - 3.31lbs / 1.50kg shells, 2,000 per gun
Anti-air guns in deck mount, 1936 Model
1 x Quad mount on centreline, aft deck centre
1 raised mount
6 - 1.85" / 47.0 mm 60.0 cal guns - 3.31lbs / 1.50kg shells, 2,000 per gun
Breech loading guns in deck mounts, 1936 Model
6 x Single mounts on sides, evenly spread
Weight of broadside 99 lbs / 45 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -

- Conning towers: Forward 2.76" / 70 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 16,000 shp / 11,936 Kw = 29.26 kts
Range 4,000nm at 10.00 kts
Bunker at max displacement = 94 tons

Complement:
79 - 103

Cost:
£0.478 million / $1.912 million

Distribution of weights at normal displacement:
Armament: 31 tons, 3.6 %
Armour: 13 tons, 1.5 %
- Armament: 7 tons, 0.8 %
- Conning Tower: 5 tons, 0.6 %
Machinery: 374 tons, 43.2 %
Hull, fittings & equipment: 277 tons, 32.1 %
Fuel, ammunition & stores: 117 tons, 13.6 %
Miscellaneous weights: 53 tons, 6.1 %
- Hull below water: 24 tons
- On freeboard deck: 29 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
351 lbs / 159 Kg = 11.5 x 3.9 " / 100 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.1 ft / 0.3 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.29
Seaboat quality (Average = 1.00): 1.03

Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.400 / 0.407
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 17.88 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 15.00 %, 22.97 ft / 7.00 m, 16.40 ft / 5.00 m
- Forward deck: 30.00 %, 16.40 ft / 5.00 m, 13.12 ft / 4.00 m
- Aft deck: 40.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Quarter deck: 15.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Average freeboard: 14.50 ft / 4.42 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 160.3 %
- Above water (accommodation/working, high = better): 140.4 %
Waterplane Area: 4,212 Square feet or 391 Square metres
Displacement factor (Displacement / loading): 80 %
Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 5.76
- Overall: 0.65
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

10t = sonar
4t = scariabombe
15t = lanciabombe + reloads
10t = extra DCs and TT
14t = 400hp Electric motors
53tons

Speed with electric motors = 10.2knts

F - Class Frigate

Six vessels laid down 1938
F1, F2, F3, F4, F5, F6

Six vessels laid down 1939
F7, F8, F9, F10, F11, F12

An anti-submarine frigate more suited to open ocean work to augment the previous Vespa and Diana Classes. The new design offers greater capability against submarine and aircraft threats whilst remaining cheap to construct.

The propulsion is the same as the previous Diana Class, with diesel and electric drive, giving long range, rapid response and quiet running at low speeds.

The main armament consists of three 76/62 single weapons. This gun was developed from the 65/64 automatic weapons program. Towards the end of 1937 it was felt that the basis of the weapon's employment had change and a larger calibre was needed to deal with surface threats. As a result, a 76mm gun was built on the same principles, with a heavier shell, a slight reduction in muzzle velocity giving a slightly shorter barrel. The development of the automatic feed continued but in the mean time a manually loaded version was adopted. This is in an enclosed weatherproof mounting with RPC. The mountings are controlled from the two lightweight GDR5 directors. Against aircraft it is expected to give much improved results than the previous classes' armament whilst retaining ability against likely surface threats. The gun armament is rounded out by twelve individual 25mm guns. The anti-submarine armament is unchanged from previous classes, with a quadruple lanciabombe weapon mounted aft and a scariabombe mounted on the fantail. A new more advanced D5 sonar set with better passive ability is mounted for the first time.

Habitability is expected to be good, with a larger superstructure for accommodation spaces than in previous classes, and a more spacious enclosed bridge. The new flush deck has lead to improved structural strength, which along with higher freeboard and thicker hull plating, will give improved capability in heavier seas. It is expected that the ship type will be the mainstay of oceanic escorts.

Fregata Antisom laid down 1938

Displacement:
1,253 t light; 1,310 t standard; 1,570 t normal; 1,777 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(307.51 ft / 295.28 ft) x 35.79 ft x (11.15 / 12.19 ft)
(93.73 m / 90.00 m) x 10.91 m x (3.40 / 3.72 m)

Armament:
3 - 3.00" / 76.2 mm 62.0 cal guns - 13.78lbs / 6.25kg shells, 500 per gun
Anti-air guns in deck and hoist mounts, 1938 Model
3 x Single mounts on centreline ends, evenly spread
1 raised mount - superfiring
12 - 0.98" / 25.0 mm 77.0 cal guns - 0.54lbs / 0.24kg shells, 4,000 per gun
Anti-air guns in deck mounts, 1938 Model
12 x Single mounts on sides amidships
Weight of broadside 48 lbs / 22 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
2nd: 0.39" / 10 mm - -

- Conning towers: Forward 2.76" / 70 mm, Aft 0.00" / 0 mm

Machinery:
Diesel Internal combustion motors,
Electric cruising motors plus geared drives, 2 shafts, 8,000 shp / 5,968 Kw = 22.26 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 467 tons

Complement:
124 - 162

Cost:
£0.461 million / $1.843 million

Distribution of weights at normal displacement:
Armament: 20 tons, 1.3 %
Armour: 26 tons, 1.6 %
- Armament: 18 tons, 1.1 %
- Conning Tower: 8 tons, 0.5 %
Machinery: 219 tons, 14.0 %
Hull, fittings & equipment: 845 tons, 53.8 %
Fuel, ammunition & stores: 317 tons, 20.2 %
Miscellaneous weights: 143 tons, 9.1 %
- Hull below water: 24 tons
- On freeboard deck: 89 tons
- Above deck: 30 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,915 lbs / 2,230 Kg = 364.1 x 3.0 " / 76 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.5 ft / 0.4 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck,
a normal bow and small transom stern
Block coefficient (normal/deep): 0.466 / 0.483
Length to Beam Ratio: 8.25 : 1
'Natural speed' for length: 18.65 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 24.61 ft / 7.50 m, 19.69 ft / 6.00 m
- Forward deck: 20.00 %, 19.69 ft / 6.00 m, 16.40 ft / 5.00 m
- Aft deck: 35.00 %, 16.40 ft / 5.00 m, 14.76 ft / 4.50 m
- Quarter deck: 25.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Average freeboard: 17.08 ft / 5.21 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 53.8 %
- Above water (accommodation/working, high = better): 177.0 %
Waterplane Area: 6,993 Square feet or 650 Square metres
Displacement factor (Displacement / loading): 232 %
Structure weight / hull surface area: 60 lbs/sq ft or 293 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 6.63
- Overall: 1.25
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

10t per 76/62 mounting
1t per 25mm mounting
10t = 2 x GDR.5 FCS
15t = D5 sonar
7t = Scaricabombe
10t = Lanciabombe AS
50t = 150 Depth charges
9t = 250hp electric creeping motors
121tons

8knts on creeping motors

Six vessels laid down 1940
F13, F14, F15, F16, F17, F18