WesWorld

HMES Damiyat (ex-Basrah, ex-Alswinn), transferred from Iraq Q2/1946
Coastal Defence Ship laid down 1926

Displacement:
1,883 t light; 1,973 t standard; 2,176 t normal; 2,338 t full load

Dimensions: Length overall / water x beam x draught
384.28 ft / 377.30 ft x 41.01 ft x 12.30 ft (normal load)
117.13 m / 115.00 m x 12.50 m x 3.75 m

Armament:
4 - 5.91" / 150 mm guns (2x2 guns), 102.98lbs / 46.71kg shells, 1926 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
4 - 3.70" / 94.0 mm guns (2x2 guns), 25.33lbs / 11.49kg shells, 1935 Model
Dual purpose guns in deck mounts
on side, all amidships
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
8 - 0.03" / 0.7 mm guns (4x2 guns), 0.00lbs / 0.00kg shells, 1926 Model
Machine guns in deck mounts
on side ends, evenly spread
Weight of broadside 551 lbs / 250 kg
Shells per gun, main battery: 140
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 210.47 ft / 64.15 m 7.68 ft / 2.34 m
Ends: Unarmoured
Main Belt covers 86 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.15" / 80 mm 1.38" / 35 mm 3.15" / 80 mm
2nd: 0.50" / 13 mm 0.50" / 13 mm -
3rd: 0.50" / 13 mm 0.50" / 13 mm -
4th: 0.59" / 15 mm - -
5th: 0.39" / 10 mm - -

- Armour deck: 1.38" / 35 mm, Conning tower: 4.72" / 120 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 12,064 shp / 9,000 Kw = 24.03 kts
Range 6,200nm at 12.00 kts
Bunker at max displacement = 365 tons

Complement:
159 - 207

Cost:
£0.614 million / $2.458 million

Distribution of weights at normal displacement:
Armament: 69 tons, 3.2 %
Armour: 537 tons, 24.7 %
- Belts: 190 tons, 8.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 87 tons, 4.0 %
- Armour Deck: 243 tons, 11.2 %
- Conning Tower: 17 tons, 0.8 %
Machinery: 386 tons, 17.7 %
Hull, fittings & equipment: 851 tons, 39.1 %
Fuel, ammunition & stores: 293 tons, 13.5 %
Miscellaneous weights: 40 tons, 1.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,995 lbs / 1,358 Kg = 29.1 x 5.9 " / 150 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 1.9 ft / 0.6 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.46
Seaboat quality (Average = 1.00): 1.61

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.400
Length to Beam Ratio: 9.20 : 1
'Natural speed' for length: 19.42 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 17.72 ft / 5.40 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: 14.04 ft / 4.28 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 84.6 %
- Above water (accommodation/working, high = better): 126.4 %
Waterplane Area: 9,525 Square feet or 885 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 55 lbs/sq ft or 270 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.73
- Longitudinal: 1.51
- Overall: 0.78
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

5th Battery Shell weight too light

Refit Changes
B and X 88mm mounts replaced by two twin 6pdr Mk II AA mounts
Both beam 88mm mounts replaced by twin 3.7in DP mounts
All 40mm replaced by 2pdr Mk II L/70 twin mounts
All 20mm replaced by twin 0.661in Vickers HMG
Addition of one Type 270 surface search radio-location set
10 tons of added misc weight for improvements to crew spaces
Refurbishment of internal fittings for life extension