WesWorld

Quoted

Project 83, Russian Small Antisubmarine Ship laid down 1947

Displacement:
600 t light; 626 t standard; 780 t normal; 903 t full load

Dimensions: Length overall / water x beam x draught
234.32 ft / 229.66 ft x 27.56 ft x 10.01 ft (normal load)
71.42 m / 70.00 m x 8.40 m x 3.05 m

Armament:
2 - 2.95" / 75.0 mm guns in single mounts, 15.43lbs / 7.00kg shells, 1947 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1947 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships
4 - 0.55" / 14.0 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1947 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 450

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.20" / 5 mm 0.20" / 5 mm
2nd: 0.59" / 15 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 9,319 shp / 6,952 Kw = 26.00 kts
Range 4,250nm at 18.00 kts
Bunker at max displacement = 277 tons

Complement:
73 - 95

Cost:
£0.416 million / $1.662 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.6 %
Armour: 4 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 230 tons, 29.5 %
Hull, fittings & equipment: 211 tons, 27.1 %
Fuel, ammunition & stores: 180 tons, 23.1 %
Miscellaneous weights: 150 tons, 19.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
473 lbs / 215 Kg = 36.7 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 0.9 ft / 0.3 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.13
Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.431
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 17.72 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17.39 ft / 5.30 m
- Forecastle (25 %): 16.40 ft / 5.00 m
- Mid (50 %): 15.42 ft / 4.70 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.37 ft / 2.55 m
- Stern: 8.53 ft / 2.60 m
- Average freeboard: 12.34 ft / 3.76 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 122.3 %
- Above water (accommodation/working, high = better): 123.5 %
Waterplane Area: 4,130 Square feet or 384 Square metres
Displacement factor (Displacement / loading): 120 %
Structure weight / hull surface area: 26 lbs/sq ft or 126 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.53
- Longitudinal: 3.02
- Overall: 0.63
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

Quoted from "Rooijen10"

Well, I think it is more a matter of looking how long a dock/slip is occupied rather than the actual build times of the vessel. If you go for the smaller design you can kick almost twice the number of ships out of your yards than the bigger design which might be something to think about since you are looking to replace almost 100 vessels from those four older classes of corvettes.