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Krokodil class, Russian Amphibious Warfare Ship laid down 1926
Displacement:
546 t light; 562 t standard; 607 t normal; 643 t full load
Dimensions: Length overall / water x beam x draught
189.32 ft / 187.01 ft x 36.09 ft x 3.94 ft (normal load)
57.71 m / 57.00 m x 11.00 m x 1.20 m
Armament:
1
- 3.94" / 100 mm guns in single mounts, 37.48lbs / 17.00kg shells, 1926 Model
Quick firing gun in deck mount
on centreline
forward
6 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1926 Model
Quick firing guns in deck mounts
on centreline, evenly spread
12 - 0.30" / 7.6 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1926 Model
Machine
guns in casemate mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 47 lbs / 21 kg
Shells per
gun, main battery: 150
80 Naval Infantry Troops
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main:
0.98" / 25 mm 187.01 ft / 57.00 m 6.56 ft / 2.00 m
Ends: Unarmoured
Upper: 0.98" / 25 mm 98.43 ft / 30.00 m 3.28 ft
/ 1.00 m
Main Belt covers 154 % of normal length
- 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 -
3rd: 0.98" / 25 mm - -
- Armour
deck: 0.39" / 10 mm, Conning tower: 1.18" / 30 mm
Machinery:
Diesel Internal combustion motors,
Geared drive,
2 shafts, 1,216 shp / 907 Kw = 14.00 kts
Range 2,100nm at 12.00 kts (Bunkerage = 81 tons)
Complement:
60 -
79
Cost:
£0.099 million / $0.397 million
Distribution of weights at normal displacement:
Armament:
5 tons, 0.8 %
Armour: 110 tons, 18.1 %
- Belts: 60 tons, 9.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament:
5 tons, 0.8 %
- Armour Deck: 43 tons, 7.1 %
- Conning Tower: 2 tons, 0.3 %
Machinery: 39 tons, 6.4 %
Hull,
fittings & equipment: 232 tons, 38.2 %
Fuel, ammunition & stores: 62 tons, 10.2 %
Miscellaneous weights: 160
tons, 26.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed
to sink ship):
1,715 lbs / 778 Kg = 56.2 x 3.9 " / 100 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00):
1.30
Metacentric height 1.7 ft / 0.5 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %):
70 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.01
Hull form
characteristics:
Hull has raised forecastle
Block coefficient: 0.800
Length to Beam Ratio: 5.18 : 1
'Natural
speed' for length: 13.68 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness
= 100): 69
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: 13.12 ft / 4.00 m
- Forecastle (20 %): 8.20 ft
/ 2.50 m (6.56 ft / 2.00 m aft of break)
- 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: 7.28 ft / 2.22 m
Ship tends to be wet forward
Ship space, strength
and comments:
Space - Hull below water (magazines/engines, low = better): 57.0 %
- Above water (accommodation/working,
high = better): 122.9 %
Waterplane Area: 5,898 Square feet or 548 Square metres
Displacement factor (Displacement
/ loading): 157 %
Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.17
- 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
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