Lieutenant Abul Majumdar Class Depot Ship
Though Bharat has six large depot ships, all of the hulls date back to the early twenties. Moreover, the quantity of depot ships is beginning to lag behind operational requirements. The expansion of the submarine arm is one such issue; the use of depot ships to establish a Bharati naval presence n places like Karachi and Porbandar is another.
While the BNS has a long-term need for both submarine depot ships and general-purpose depot ships, it is the former that will receive immediate attention. At least four units will be constructed, following which one or two of the older Grival class tenders will be re-assigned to general-purpose depot functions. BNS planners expect that another run of four or so new depot ships would be ordered from 1949 onward to replace the Sen class.
The class is being built to civilian standards.
Lieutenant Abul Majumdar, AD-13, laid down 1946
Petty Officer Sharang Nath, AD-14, laid down 1946
Enter ship name, Enter country Enter ship type laid down 1946
Displacement:
5,956 t light; 6,140 t standard; 8,109 t normal; 9,685 t full load
Dimensions: Length overall / water x beam x draught
473.79 ft / 462.60 ft x 62.34 ft x 16.40 ft (normal load)
144.41 m / 141.00 m x 19.00 m x 5.00 m
Armament:
1 - 4.92" / 125 mm guns in single mounts, 59.59lbs / 27.03kg shells, 1946 Model
Dual purpose gun in a deck mount with hoist
on centreline aft, 1 raised gun
8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.98" / 25.0 mm guns (4x2 guns), 0.48lbs / 0.22kg shells, 1946 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 109 lbs / 49 kg
Shells per gun, main battery: 300
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
2nd: 0.79" / 20 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 6,435 shp / 4,800 Kw = 16.18 kts
Range 20,000nm at 15.00 kts
Bunker at max displacement = 3,544 tons
Complement:
426 - 555
Cost:
£1.719 million / $6.874 million
Distribution of weights at normal displacement:
Armament: 14 tons, 0.2 %
Armour: 11 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 161 tons, 2.0 %
Hull, fittings & equipment: 2,560 tons, 31.6 %
Fuel, ammunition & stores: 2,153 tons, 26.6 %
Miscellaneous weights: 3,211 tons, 39.6 %
-1,600 t: Accommodation for 800 at 2 t per
-600 t: Dry stores
-400 t: Workshops
-200 t: Crew Amenities
-111 t: Weight reserve
-100 t: Flag facilities
-100 t: Medical facilities
-100 t: Comms, Fire Control & Electronics
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,942 lbs / 9,953 Kg = 368.2 x 4.9 " / 125 mm shells or 3.4 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 3.0 ft / 0.9 m
Roll period: 15.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, rise aft of midbreak, low quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 7.42 : 1
'Natural speed' for length: 21.51 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (20 %): 26.25 ft / 8.00 m (18.37 ft / 5.60 m aft of break)
- Mid (50 %): 18.37 ft / 5.60 m (26.25 ft / 8.00 m aft of break)
- Quarterdeck (15 %): 18.37 ft / 5.60 m (26.25 ft / 8.00 m before break)
- Stern: 18.37 ft / 5.60 m
- Average freeboard: 22.70 ft / 6.92 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 52.0 %
- Above water (accommodation/working, high = better): 213.2 %
Waterplane Area: 21,091 Square feet or 1,959 Square metres
Displacement factor (Displacement / loading): 222 %
Structure weight / hull surface area: 77 lbs/sq ft or 377 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.12
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
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