Omar Khayyam, Persia Light Cruiser laid down 1911 (Engine 1906)
Displacement:
4.474 t light; 4.626 t standard; 5.165 t normal; 5.597 t full load
Dimensions: Length overall / water x beam x draught
392,25 ft / 388,78 ft x 49,21 ft x 19,69 ft (normal load)
119,56 m / 118,50 m x 15,00 m x 6,00 m
Armament:
4 - 5,91" / 150 mm guns in single mounts, 102,98lbs / 46,71kg shells, 1911 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1911 Model
Quick firing guns in deck mounts
on side, all amidships
4 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1911 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 542 lbs / 246 kg
Shells per gun, main battery: 150
4 - 18,0" / 457,2 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5,91" / 150 mm 291,57 ft / 88,87 m 8,43 ft / 2,57 m
Ends: Unarmoured
Upper: 1,97" / 50 mm 291,57 ft / 88,87 m 8,01 ft / 2,44 m
Main Belt covers 115 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm 0,98" / 25 mm 0,98" / 25 mm
- Armour deck: 1,97" / 50 mm, Conning tower: 3,94" / 100 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 21.357 shp / 15.933 Kw = 24,00 kts
Range 3.500nm at 14,00 kts
Bunker at max displacement = 971 tons
Complement:
304 - 396
Cost:
£0,408 million / $1,631 million
Distribution of weights at normal displacement:
Armament: 68 tons, 1,3 %
Armour: 1.290 tons, 25,0 %
- Belts: 789 tons, 15,3 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 20 tons, 0,4 %
- Armour Deck: 456 tons, 8,8 %
- Conning Tower: 25 tons, 0,5 %
Machinery: 1.387 tons, 26,8 %
Hull, fittings & equipment: 1.579 tons, 30,6 %
Fuel, ammunition & stores: 691 tons, 13,4 %
Miscellaneous weights: 150 tons, 2,9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5.885 lbs / 2.670 Kg = 57,2 x 5,9 " / 150 mm shells or 1,1 torpedoes
Stability (Unstable if below 1.00): 1,23
Metacentric height 2,5 ft / 0,8 m
Roll period: 13,1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,25
Seaboat quality (Average = 1.00): 1,39
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,480
Length to Beam Ratio: 7,90 : 1
'Natural speed' for length: 19,72 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 19,69 ft / 6,00 m
- Forecastle (10 %): 15,78 ft / 4,81 m
- Mid (50 %): 15,78 ft / 4,81 m
- Quarterdeck (15 %): 15,78 ft / 4,81 m
- Stern: 15,78 ft / 4,81 m
- Average freeboard: 15,94 ft / 4,86 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 100,8 %
- Above water (accommodation/working, high = better): 110,7 %
Waterplane Area: 12.521 Square feet or 1.163 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 75 lbs/sq ft or 367 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,92
- Longitudinal: 2,11
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily