Persian Corvettes

[ledeper]

01-05, Persia Corvettes laid down 1914 (Engine 1909)

Displacement:
   750 t light; 777 t standard; 941 t normal; 1.073 t full load

Dimensions: Length overall / water x beam x draught
   229,66 ft / 229,66 ft x 26,25 ft x 11,48 ft (normal load)
   70,00 m / 70,00 m x 8,00 m  x 3,50 m

Armament:
      3 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1914 Model
     Quick firing guns in deck mounts
     on centreline ends, majority forward, 1 raised mount
      2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1914 Model
     Quick firing guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 95 lbs / 43 kg
   Shells per gun, main battery: 150

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 7.231 shp / 5.394 Kw = 22,60 kts
   Range 5.000nm at 12,00 kts
   Bunker at max displacement = 296 tons

Complement:
   84 - 110

Cost:
   £0,105 million / $0,419 million

Distribution of weights at normal displacement:
   Armament: 12 tons, 1,3 %
   Machinery: 329 tons, 34,9 %
   Hull, fittings & equipment: 309 tons, 32,8 %
   Fuel, ammunition & stores: 192 tons, 20,3 %
   Miscellaneous weights: 100 tons, 10,6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     646 lbs / 293 Kg = 21,2 x 3,9 " / 100 mm shells or 0,3 torpedoes
   Stability (Unstable if below 1.00): 1,20
   Metacentric height 0,9 ft / 0,3 m
   Roll period: 11,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0,18
   Seaboat quality  (Average = 1.00): 1,20

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,476
   Length to Beam Ratio: 8,75 : 1
   'Natural speed' for length: 15,15 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      13,12 ft / 4,00 m
      - Forecastle (20 %):   10,60 ft / 3,23 m
      - Mid (50 %):      10,60 ft / 3,23 m
      - Quarterdeck (15 %):   10,60 ft / 3,23 m
      - Stern:      10,60 ft / 3,23 m
      - Average freeboard:   10,80 ft / 3,29 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 134,4 %
      - Above water (accommodation/working, high = better): 94,5 %
   Waterplane Area: 3.931 Square feet or 365 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 40 lbs/sq ft or 194 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,87
      - Longitudinal: 3,25
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Good seaboat, rides out heavy weather easily

Wt 15 tns
Mines 70 tns
Sweepng Gear 10 tns
Reserve 05 tns