Thinking of building some Patrolboats
PB, Persia Patrolboat laid down 1936
Displacement:
596 t light; 629 t standard; 779 t normal; 899 t full load
Dimensions: Length overall / water x beam x draught
196,85 ft / 196,85 ft x 22,31 ft x 13,12 ft (normal load)
60,00 m / 60,00 m x 6,80 m x 4,00 m
Armament:
3 - 5,12" / 130 mm guns in single mounts, 67,03lbs / 30,40kg shells, 1936 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 1 raised mount
6 - 0,98" / 25,0 mm guns (3x2 guns), 0,48lbs / 0,22kg shells, 1936 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 2 raised mounts - superfiring
Weight of broadside 204 lbs / 93 kg
Shells per gun, main battery: 150
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm 1,18" / 30 mm -
2nd: 0,79" / 20 mm - -
- Armour deck: 0,79" / 20 mm, Conning tower: 2,36" / 60 mm
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 12 877 shp / 9 606 Kw = 26,00 kts
Range 3 000nm at 18,00 kts
Bunker at max displacement = 270 tons
Complement:
73 - 95
Cost:
£0,441 million / $1,763 million
Distribution of weights at normal displacement:
Armament: 25 tons, 3,3 %
Armour: 62 tons, 8,0 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 16 tons, 2,1 %
- Armour Deck: 42 tons, 5,4 %
- Conning Tower: 4 tons, 0,6 %
Machinery: 295 tons, 37,9 %
Hull, fittings & equipment: 212 tons, 27,3 %
Fuel, ammunition & stores: 183 tons, 23,5 %
Miscellaneous weights: 0 tons, 0,0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
292 lbs / 132 Kg = 4,4 x 5,1 " / 130 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,10
Metacentric height 0,6 ft / 0,2 m
Roll period: 11,6 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0,91
Seaboat quality (Average = 1.00): 1,00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,480
Length to Beam Ratio: 8,96 : 1
'Natural speed' for length: 14,03 kts
Power going to wave formation at top speed: 72 %
Trim (Max stability = 0, Max steadiness = 100): 76
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: 14,76 ft / 4,50 m
- Forecastle (20 %): 13,12 ft / 4,00 m
- Mid (50 %): 13,12 ft / 4,00 m (9,84 ft / 3,00 m aft of break)
- Quarterdeck (15 %): 9,84 ft / 3,00 m
- Stern: 9,84 ft / 3,00 m
- Average freeboard: 11,61 ft / 3,54 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 147,8 %
- Above water (accommodation/working, high = better): 85,2 %
Waterplane Area: 2 874 Square feet or 267 Square metres
Displacement factor (Displacement / loading): 79 %
Structure weight / hull surface area: 29 lbs/sq ft or 141 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,56
- Longitudinal: 5,75
- Overall: 0,71
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
This post has been edited 1 times, last edit by "Vukovlad" (May 22nd 2008, 7:05pm)