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1

Wednesday, June 3rd 2009, 3:55am

Pakistani Destroyer

Quoted

Tariq, Pakistani Destroyer laid down 1938

Displacement:
2,265 t light; 2,363 t standard; 2,618 t normal; 2,822 t full load

Dimensions: Length overall / water x beam x draught
399.43 ft / 393.00 ft x 38.00 ft x 13.00 ft (normal load)
121.75 m / 119.79 m x 11.58 m x 3.96 m

Armament:
5 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority aft, 3 raised mounts - superfiring
2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on centreline, all aft, all raised mounts - superfiring
12 - 1.46" / 37.0 mm guns (6x2 guns), 1.55lbs / 0.70kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 305 lbs / 138 kg
Shells per gun, main battery: 250
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.95" / 75 mm 1.38" / 35 mm 2.95" / 75 mm
2nd: 0.79" / 20 mm - -
3rd: 0.59" / 15 mm - -

- Conning tower: 4.92" / 125 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 53,608 shp / 39,992 Kw = 35.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 459 tons

Complement:
182 - 237

Cost:
£1.657 million / $6.629 million

Distribution of weights at normal displacement:
Armament: 38 tons, 1.5 %
Armour: 61 tons, 2.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 40 tons, 1.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 20 tons, 0.8 %
Machinery: 1,305 tons, 49.8 %
Hull, fittings & equipment: 812 tons, 31.0 %
Fuel, ammunition & stores: 353 tons, 13.5 %
Miscellaneous weights: 50 tons, 1.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
793 lbs / 360 Kg = 15.3 x 4.7 " / 119 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.5 ft / 0.5 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.09

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.472
Length to Beam Ratio: 10.34 : 1
'Natural speed' for length: 22.64 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.00 ft / 7.32 m
- Forecastle (20 %): 23.00 ft / 7.01 m
- Mid (50 %): 22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 18.43 ft / 5.62 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 175.0 %
- Above water (accommodation/working, high = better): 119.4 %
Waterplane Area: 10,086 Square feet or 937 Square metres
Displacement factor (Displacement / loading): 78 %
Structure weight / hull surface area: 39 lbs/sq ft or 189 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.39
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

2

Wednesday, June 3rd 2009, 10:42pm

I'm not sure whether the armament will fit very well. There isn't a great deal of room on the centreline even if the 3" weapons are moved to the beam.

3

Thursday, June 4th 2009, 12:03am

I don't see why you'd need 3" AA guns if your ship is carrying a DP main armament. That would be like installing 4" guns on a "Dido". Why not go for an extra 4.7" gun? Or, if you feel 3" guns are an absolute necessity, they should be in lieu of the 37mm mountings as in the Gearings (except singles in lieu of twins instead of twins in lieu of quads). Given the 38' beam you may also want to consider dropping the 3" guns altogether for pentad torpedo tubes in place of the quads. I really don't think your DD design is long enough for seven centerline gun mountings. Other than that, I think it sounds pretty reasonable.