[SIZE=3]Miraj Class Destroyer[/SIZE]
The Miraj class destroyers, like the Ahmadabad class cruisers, have been designed for the specific purpose of escorting the Talwar class aircraft carriers. To this end, there have been several changes from the preceding Bhubaneshwar class destroyers.
The gun armament has been increased to six guns, concentrated in three dual-purpose mounts. This is one less mount than found in the Bhubaneshwar, which has freed up space for additional anti-aircraft weapons. An additional twin 35 mm is installed aft, and a second 15 mm quadruple mount has also been added.
The ASW fit includes the standard depth charge racks aft and four depth-charge throwers amidships. A non-publicized addition is the enlargement of the sonar dome to accommodate a second oscillator angled at thrity five degrees from the horizontal (versus the ten degrees offset of the primary oscillator). In theory, this second oscillator will be used during an attack run, where the steeper angle should allow for contacts to be maintained longer - leading to a more accurate attack.
Speed has decreased as a result of the heavier armament and, as importantly, the longer operating range. The additional bunkerage has been supplied so that carrier operations are not too inhibited by a need to refuel escorts.
A less dramatic change from the Bhubaneshwar class is the different hull form, with a long, sloping forecastle that levels out aft of the second funnel. This should keep the forecastle dry and allow for decent seakeeping, while not costing too much hull strength.
Six untis are planned for 1933, two more for 1934.
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Miraj, D-59, laid down 1933
Damoh, D-60, laid down 1933
Khargon, D-61, laid down 1933
Murwara, D-62, to be laid down 1933
Nimach, D-63, to be laid down 1933
Mahbubnagar, D-64, to be laid down 1933
Jorhat, D-65, projected for 1934
Bellary, D-66, projected for 1934
Displacement:
1,586 t light; 1,678 t standard; 1,951 t normal; 2,170 t full load
Dimensions: Length overall / water x beam x draught
394.14 ft / 372.05 ft x 34.45 ft x 13.32 ft (normal load)
120.13 m / 113.40 m x 10.50 m x 4.06 m
Armament:
6 - 4.92" / 125 mm guns (3x2 guns), 59.59lbs / 27.03kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority aft, 1 raised mount aft - superfiring
8 - 1.38" / 35.0 mm guns (4x2 guns), 1.31lbs / 0.59kg shells, 1933 Model
Anti-aircraft guns in deck mounts with hoists
on side, evenly spread, all raised mounts
8 - 0.59" / 15.0 mm guns (2x4 guns), 0.10lbs / 0.05kg shells, 1933 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 369 lbs / 167 kg
Shells per gun, main battery: 250
8 - 21.7" / 550 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 36,192 shp / 26,999 Kw = 33.49 kts
Range 10,000nm at 12.00 kts (Bunkerage = 492 tons)
Complement:
146 - 190
Cost:
£1.038 million / $4.151 million
Distribution of weights at normal displacement:
Armament: 46 tons, 2.4 %
Armour: 18 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 18 tons, 0.9 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 895 tons, 45.9 %
Hull, fittings & equipment: 570 tons, 29.2 %
Fuel, ammunition & stores: 365 tons, 18.7 %
Miscellaneous weights: 58 tons, 3.0 %
15 t: Sonar
-10 t: DC racks
-16 t: 4 DCT + charges
-17 t: Weight reserve
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
510 lbs / 231 Kg = 8.6 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality (Average = 1.00): 1.01
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.80 : 1
'Natural speed' for length: 22.17 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.90 ft / 8.20 m
- Forecastle (20 %): 19.03 ft / 5.80 m
- Mid (50 %): 11.15 ft / 3.40 m
- Quarterdeck (15 %): 11.15 ft / 3.40 m
- Stern: 11.15 ft / 3.40 m
- Average freeboard: 14.54 ft / 4.43 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 170.6 %
- Above water (accommodation/working, high = better): 75.2 %
Waterplane Area: 8,187 Square feet or 761 Square metres
Displacement factor (Displacement / loading): 76 %
Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.59
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
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