Persian Destroyers

[ledeper]

Quom-class, Persian Destroyer laid down 1909 (Engine 1906)

Displacement:
   495 t light; 512 t standard; 577 t normal; 629 t full load

Dimensions: Length overall / water x beam x draught
   180,45 ft / 180,45 ft x 19,69 ft x 13,12 ft (normal load)
   55,00 m / 55,00 m x 6,00 m  x 4,00 m

Armament:
      2 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1909 Model
     Quick firing guns in deck mounts
     on centreline, all forward, 1 raised mount
      2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1909 Model
     Breech loading guns in deck mounts
     on side, all amidships
   Weight of broadside 68 lbs / 31 kg
   Shells per gun, main battery: 130
   2 - 18,0" / 457,2 mm above water torpedoes

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 12.876 shp / 9.606 Kw = 27,00 kts
   Range 2.500nm at 10,00 kts
   Bunker at max displacement = 117 tons (80% coal)
     Caution: Delicate, lightweight machinery

Complement:
   58 - 76

Cost:
   £0,069 million / $0,275 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,5 %
   Machinery: 316 tons, 54,7 %
   Hull, fittings & equipment: 141 tons, 24,5 %
   Fuel, ammunition & stores: 82 tons, 14,1 %
   Miscellaneous weights: 30 tons, 5,2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     111 lbs / 50 Kg = 3,5 x 4,0 " / 102 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,14
   Metacentric height 0,6 ft / 0,2 m
   Roll period: 11,0 seconds
   Steadiness   - As gun platform (Average = 50 %): 44 %
         - Recoil effect (Restricted arc if above 1.00): 0,33
   Seaboat quality  (Average = 1.00): 0,77

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,433
   Length to Beam Ratio: 9,17 : 1
   'Natural speed' for length: 13,43 kts
   Power going to wave formation at top speed: 74 %
   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 %):   10,24 ft / 3,12 m
      - Mid (50 %):      10,24 ft / 3,12 m
      - Quarterdeck (15 %):   10,24 ft / 3,12 m
      - Stern:      10,24 ft / 3,12 m
      - Average freeboard:   10,47 ft / 3,19 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 193,3 %
      - Above water (accommodation/working, high = better): 53,7 %
   Waterplane Area: 2.236 Square feet or 208 Square metres
   Displacement factor (Displacement / loading): 30 %
   Structure weight / hull surface area: 23 lbs/sq ft or 112 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 5,53
      - Overall: 0,63
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Dd 01 Qoum
Dd02 Teheran
Dd03 Izfahan
Dd04 Shiraz