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Fantasy Fleet Page
S-27 class Subchasers
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S-27 class is more capable in AWS patrol and convoy escort than previous classes.

S-27 class, Russian wooden subchaser laid down 1927

Displacement:
100 t light; 103 t standard; 115 t normal; 124 t full load

Dimensions: Length overall / water x beam x draught
111.55 ft / 111.55 ft x 16.90 ft x 4.27 ft (normal load)
34.00 m / 34.00 m x 5.15 m x 1.30 m

Armament:
1 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1927 Model
Breech loading gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
Breech loading guns in deck mount
on centreline aft
Weight of broadside 9 lbs / 4 kg
Shells per gun, main battery: 150
25 tons depth charges/mines

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.20" / 5 mm -
2nd: 0.98" / 25 mm 0.20" / 5 mm -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 701 shp / 523 Kw = 16.00 kts
Range 3,000nm at 10.00 kts (Bunkerage = 21 tons)

Complement:
16 - 22

Cost:
0.027 million / $0.109 million

Distribution of weights at normal displacement:
Armament: 1 tons, 1.0 %
Armour: 1 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 1.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 22 tons, 19.3 %
Hull, fittings & equipment: 50 tons, 43.6 %
Fuel, ammunition & stores: 15 tons, 13.2 %
Miscellaneous weights: 25 tons, 21.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
214 lbs / 97 Kg = 37.8 x 2.2 " / 57 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.4 ft / 0.1 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.27

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 6.60 : 1
'Natural speed' for length: 10.56 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 9.84 ft / 3.00 m
- Forecastle (20 %): 8.20 ft / 2.50 m
- Mid (50 %): 7.55 ft / 2.30 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 7.59 ft / 2.31 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.1 %
- Above water (accommodation/working, high = better): 111.1 %
Waterplane Area: 1,256 Square feet or 117 Square metres
Displacement factor (Displacement / loading): 145 %
Structure weight / hull surface area: 21 lbs/sq ft or 104 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 6.16
- 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


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