WesWorld

P-2, Persia Patrolboat laid down 1936

Displacement:
421 t light; 440 t standard; 490 t normal; 531 t full load

Dimensions: Length overall / water x beam x draught
197,35 ft / 196,85 ft x 19,69 ft x 9,84 ft (normal load)
60,15 m / 60,00 m x 6,00 m x 3,00 m

Armament:
2 - 4,13" / 105 mm guns (1x2 guns), 35,32lbs / 16,02kg shells, 1936 Model
Dual purpose guns in a deck mount with hoist
on centreline forward
12 - 0,98" / 25,0 mm guns (6x2 guns), 0,48lbs / 0,22kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
2 - 0,98" / 25,0 mm guns (1x2 guns), 0,48lbs / 0,22kg shells, 1936 Model
Machine guns in deck mount
on centreline aft
Weight of broadside 77 lbs / 35 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,57" / 40 mm - -
2nd: 0,79" / 20 mm - -

- Armour deck: 0,39" / 10 mm, Conning tower: 1,57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 6 489 shp / 4 841 Kw = 24,00 kts
Range 5 000nm at 11,00 kts
Bunker at max displacement = 91 tons

Complement:
51 - 67

Cost:
£0,251 million / $1,003 million

Distribution of weights at normal displacement:
Armament: 10 tons, 2,0 %
Armour: 27 tons, 5,4 %
- Belts: 0 tons, 0,0 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 7 tons, 1,5 %
- Armour Deck: 17 tons, 3,5 %
- Conning Tower: 2 tons, 0,4 %
Machinery: 176 tons, 36,0 %
Hull, fittings & equipment: 168 tons, 34,3 %
Fuel, ammunition & stores: 70 tons, 14,2 %
Miscellaneous weights: 40 tons, 8,2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
220 lbs / 100 Kg = 6,2 x 4,1 " / 105 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,02
Metacentric height 0,5 ft / 0,1 m
Roll period: 12,3 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0,78
Seaboat quality (Average = 1.00): 1,18

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,450
Length to Beam Ratio: 10,00 : 1
'Natural speed' for length: 14,03 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 2,50 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11,48 ft / 3,50 m
- Forecastle (20 %): 9,84 ft / 3,00 m
- Mid (50 %): 9,84 ft / 3,00 m
- Quarterdeck (15 %): 9,84 ft / 3,00 m
- Stern: 9,84 ft / 3,00 m
- Average freeboard: 9,97 ft / 3,04 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 141,1 %
- Above water (accommodation/working, high = better): 86,6 %
Waterplane Area: 2 355 Square feet or 219 Square metres
Displacement factor (Displacement / loading): 96 %
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,62
- Longitudinal: 4,37
- Overall: 0,75
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

40t Misc. weight for Mines/DC and other future equipment

Comments?