WesWorld

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.

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

Also planned for 1946 is a pair of cargo ships to support amphibious operations. Given that the BNS only has a single-brigade capability, there has been some question about the need for more than one vessel; some are of the view that the senior leadership are stealthily building up to a two-brigade lift capability. For now, Word of God simply indicates that one vessel would be useful for each coast, given the distances involved.

You'll have seen this design presented in the "Foolin' Around" thread as an ammo ship; construction of a sub-type for that role remains under consideration.

This class will be built to civilian standards.

Thinking Calm Thoughts, Bharati Ammo/Cargo Ship, laid down 1946

Displacement:
4,626 t light; 4,761 t standard; 5,449 t normal; 5,999 t full load

Dimensions: Length overall / water x beam x draught
333.23 ft / 328.08 ft x 65.62 ft x 14.76 ft (normal load)
101.57 m / 100.00 m x 20.00 m x 4.50 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
6 - 2.24" / 57.0 mm guns (3x2 guns), 5.65lbs / 2.56kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 1 raised mount
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 97 lbs / 44 kg
Shells per gun, main battery: 400

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,
No drive to shaft, 2 shafts, 13,405 shp / 10,000 Kw = 20.15 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,238 tons

Complement:
316 - 412

Cost:
£1.553 million / $6.212 million

Distribution of weights at normal displacement:
Armament: 12 tons, 0.2 %
Armour: 9 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 9 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 335 tons, 6.1 %
Hull, fittings & equipment: 1,671 tons, 30.7 %
Fuel, ammunition & stores: 822 tons, 15.1 %
Miscellaneous weights: 2,599 tons, 47.7 %
-2,000 t: Ammunition storage (ammo ships) or bulk cargo (cargo ships)
-200 t: Refrigeration equipement
-200 t: Cranes/Derricks
-100 t: Extra boats/LCM
-99 t: Weight reserve, possibly a bit of passenger accommodation

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,377 lbs / 4,707 Kg = 174.1 x 4.9 " / 125 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 3.2 ft / 1.0 m
Roll period: 15.3 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.59

Hull form characteristics:
Hull has raised forecastle, rise aft of midbreak, low quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 18.11 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 38
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: 29.20 ft / 8.90 m
- Forecastle (20 %): 24.28 ft / 7.40 m (16.40 ft / 5.00 m aft of break)
- Mid (50 %): 16.40 ft / 5.00 m (24.28 ft / 7.40 m aft of break)
- Quarterdeck (15 %): 16.40 ft / 5.00 m (24.28 ft / 7.40 m before break)
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 21.13 ft / 6.44 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 74.5 %
- Above water (accommodation/working, high = better): 195.9 %
Waterplane Area: 15,745 Square feet or 1,463 Square metres
Displacement factor (Displacement / loading): 161 %
Structure weight / hull surface area: 74 lbs/sq ft or 360 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.11
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Meanwhile, a couple of slightly-used cargo vessels are being purchased and refitted into service as packets. They''ll be charged with delivery of bulk goods to depots along the coast and the offshore naval bases.

Enter ship name, Enter country Enter ship type laid down 1939

Displacement:
2,053 t light; 2,128 t standard; 3,148 t normal; 3,964 t full load

Dimensions: Length overall / water x beam x draught
265.94 ft / 262.47 ft x 49.21 ft x 13.12 ft (normal load)
81.06 m / 80.00 m x 15.00 m x 4.00 m

Armament:
2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1939 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns
4 - 0.98" / 25.0 mm guns (2x2 guns), 0.48lbs / 0.22kg shells, 1939 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 13 lbs / 6 kg
Shells per gun, main battery: 1,500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 3,218 shp / 2,400 Kw = 15.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 612 tons
(Simmed as: Range 15,000nm at 15.00 kts
Bunker at max displacement = 1,836 tons)

Complement:
209 - 273

Cost:
£0.497 million / $1.988 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.1 %
Armour: 2 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 87 tons, 2.8 %
Hull, fittings & equipment: 794 tons, 25.2 %
Fuel, ammunition & stores: 1,095 tons, 34.8 %
Miscellaneous weights: 1,168 tons, 37.1 % + 1,224 t simmed as bunkerage
-950 t: Bulk cargo
-100 t: 2 x 25 t and 1 x 50 t derrick
-50 t: Air conditioning for cargo
-20 t: Accommodaton for ten passengers at 2 t per
-20 t: Fire control, electroncs, and comms
-28 t: Weight reserve
-1,224 t: Below-decks fuel stores


Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,921 lbs / 3,593 Kg = 1,401.8 x 2.2 " / 57 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 2.7 ft / 0.8 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has raised forecastle, rise aft of midbreak, low quarterdeck
Block coefficient: 0.650
Length to Beam Ratio: 5.33 : 1
'Natural speed' for length: 16.20 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 25
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 (20 %): 19.69 ft / 6.00 m (11.81 ft / 3.60 m aft of break)
- Mid (50 %): 11.81 ft / 3.60 m (19.69 ft / 6.00 m aft of break)
- Quarterdeck (35 %): 11.81 ft / 3.60 m (19.69 ft / 6.00 m before break)
- Stern: 11.81 ft / 3.60 m
- Average freeboard: 14.57 ft / 4.44 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 51.2 %
- Above water (accommodation/working, high = better): 128.4 %
Waterplane Area: 9,756 Square feet or 906 Square metres
Displacement factor (Displacement / loading): 232 %
Structure weight / hull surface area: 56 lbs/sq ft or 274 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.39
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Just a thought on the depot ship design - the amount of space for workshops - 400 tons - seems a bit small in relation to the number of personnel - 800 - implied by the accommodations. Given that the workshops would have a large amount of machinery taking up much of the space, would there be enough room for the maintenance crews to function? Or would they be working elsewhere?

I'm assuming the people running the workshops are for the most part of the "default" crew. The accommodation is primarily for the submariners, so don't have to spend their port time smooshed in little submarine bunks.'

Quoted from "The Rock Doctor"

I'm assuming the people running the workshops are for the most part of the "default" crew. The accommodation is primarily for the submariners, so don't have to spend their port time smooshed in little submarine bunks.'

Okay - I can go along with that line of thought. I find Springsharp's default crew calculations rather mis-leading, particularly when it comes to auxiliaries.

I imagine it's a very wild-assed guess on the program's fault.

Quoted from "The Rock Doctor"

I imagine it's a very wild-assed guess on the program's fault.

By observation it looks to be an algorithm based solely on light tonnage. At least in our SS 2.1; maybe 3.0 is different but I doubt it.

Quoted

I find Springsharp's default crew calculations rather mis-leading, particularly when it comes to auxiliaries.

According to the springstyle notes, the crew number of merchant ships need to be divided by 10, that of naval transports by 5 and that of submarines by 2. Naval auxiliaries would probably need to be divided as well by some number to get a more reasonable crew figure.

Quoted

By observation it looks to be an algorithm based solely on light tonnage.

Not sure if I get this one. You're saying that the crew value changes in SS when I add more fuel to my ship and thus lower light and standard displacement? Cause if that is the case, then I do not really see it happening when I alter the 'range' of one of my oiler designs...

Quoted from "Rooijen10"

Quoted

I find Springsharp's default crew calculations rather mis-leading, particularly when it comes to auxiliaries.

According to the springstyle notes, the crew number of merchant ships need to be divided by 10, that of naval transports by 5 and that of submarines by 2. Naval auxiliaries would probably need to be divided as well by some number to get a more reasonable crew figure.

Quoted

By observation it looks to be an algorithm based solely on light tonnage.

Not sure if I get this one. You're saying that the crew value changes in SS when I add more fuel to my ship and thus lower light and standard displacement? Cause if that is the case, then I do not really see it happening when I alter the 'range' of one of my oiler designs...

Yes - to get a more realistic value for crew sizes on auxiliaries, some factor would have to be agreed upon - what that should be I am not certain. Something above a merchantman's and perhaps closer to that of a naval transport.

I've not worked out the actual function of an algorithm - merely that by observation that the larger the light tonnage of a vessel, the larger the crew size required. It might be bracketed rather than a proper algorithm - "light tonnage 5,000 - 8,000, crew size = X". I don't see crew size as that crucial a computation.

Quoted

Yes - to get a more realistic value for crew sizes on auxiliaries, some factor would have to be agreed upon - what that should be I am not certain. Something above a merchantman's and perhaps closer to that of a naval transport.

Sounds like you are suggesting dividing the value by 6. (= 16.67% which would be more than 10% and closer to 20%)

Quoted

merely that by observation that the larger the light tonnage of a vessel, the larger the crew size required.

I don't know how you observe that (unless I misinterpret all that you are saying). Messing around with numerous different ranges of a tanker design, the size of light, standard or full load displacement have no influence on the crew size. It does not matter whether I end up with a light dispacement of -241,994 tons, 0 tons or 355,843 tons (almost 6 times the normal displacement of the sim I used) or any other value, the crew remains the same as long as the normal displacement remains the same.

Quoted from "Rooijen10"

Quoted

Yes - to get a more realistic value for crew sizes on auxiliaries, some factor would have to be agreed upon - what that should be I am not certain. Something above a merchantman's and perhaps closer to that of a naval transport.

Sounds like you are suggesting dividing the value by 6. (= 16.67% which would be more than 10% and closer to 20%)

Quoted

merely that by observation that the larger the light tonnage of a vessel, the larger the crew size required.

I don't know how you observe that (unless I misinterpret all that you are saying). Messing around with numerous different ranges of a tanker design, the size of light, standard or full load displacement have no influence on the crew size. It does not matter whether I end up with a light dispacement of -241,994 tons, 0 tons or 355,843 tons (almost 6 times the normal displacement of the sim I used) or any other value, the crew remains the same as long as the normal displacement remains the same.

Interesting results. I guess the determining factor is normal as opposed to light displacement; as I said, it was an observation, not a scientific test.