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1

Sunday, June 23rd 2013, 3:01am

New Bharati Ships - 1944

The Bharatiya Nau Sena has had a rather...erratic history of laying down its minor combattants. Some of that was attention to other priorities, some of it was conscious decision-making, and some of it was...something else. That's why the BNS added a heap of sloops during the mid-thirties, then added a heap of destroyers in the late thirties, while adding subs in dribs and drabs.

More recently, steps had been taken to regularize production by laying down subs and sloops on an ongoing basis, with destroyers to be added in 1944. This didn't entirely work so well, either. A division of minor combattants might take up to two years to be built, ensuring the unit as a whole had a long work-up period. Meanwhile, there was less down-time between lay-downs to examine operational successes and failures and revise designs accordingly.

So the BNS is altering its approach to minor combattants, with the full endorsement of technocratic elements of the new government. The BNS's "Comprehensive Minor Combattant Program" will operate on a six year schedule, using three specific slipways. The program looks like this:

1944: 6 x destroyer
1945: 6 x coastal sloop/minesweeper
1946: 6 x submarine
1947: 6 x destroyer
1948: 6 x ocean-going sloop
1949: 6 x submarine

Theoretically, the cycle would repeat in 1950-55, though that would require a political decision and the continuation of the sim.

This ensures that there is some predictability in acquisitions, that there is a suitable period between construction of one class of a type (say, DD-1944) and laying-down of the next class (DD-1947), and that a new division of ships is completed within half a year of each other.

First up is the Rawalpindi class destroyers, which will likely be tasked with screening CV Bagh Nakh when they enter service (and I thank Brock for simming this out...).

Rawalpindi, Indian Destroyer laid down 1944

Displacement:
2,091 t light; 2,236 t standard; 2,519 t normal; 2,745 t full load

Dimensions: Length overall / water x beam x draught
400.46 ft / 393.54 ft x 36.09 ft x 14.11 ft (normal load)
122.06 m / 119.95 m x 11.00 m x 4.30 m

Armament:
6 - 4.92" / 125 mm guns (3x2 guns), 60.10lbs / 27.26kg shells, 1944 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority aft, 1 raised mount aft - superfiring
8 - 2.24" / 57.0 mm guns (4x2 guns), 5.71lbs / 2.59kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
8 - 0.59" / 15.0 mm guns (4x2 guns), 0.10lbs / 0.05kg shells, 1944 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 407 lbs / 185 kg
Shells per gun, main battery: 400
10 - 21.7" / 550 mm above water torpedoes

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: 0.98" / 25 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 50,939 shp / 38,000 Kw = 34.99 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 509 tons

Complement:
177 - 231

Cost:
£1.868 million / $7.474 million

Distribution of weights at normal displacement:
Armament: 50 tons, 2.0 %
Armour: 31 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 31 tons, 1.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,158 tons, 46.0 %
Hull, fittings & equipment: 706 tons, 28.0 %
Fuel, ammunition & stores: 428 tons, 17.0 %
Miscellaneous weights: 145 tons, 5.8 %
-50 t: Radars, sonar, other electronics
-43 t: Weight reserve
-20 t: Rails, throwers, and 60 depth charges
-20 t: Mangus ASW system (15 t) with five reload salvos
-12 t: Blast shielding aft of, and deck reinforcement below, Mangus ASW system

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
659 lbs / 299 Kg = 11.1 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.58
Seaboat quality (Average = 1.00): 0.96

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.440
Length to Beam Ratio: 10.90 : 1
'Natural speed' for length: 22.65 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 63
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: 20.67 ft / 6.30 m
- Forecastle (20 %): 18.70 ft / 5.70 m (15.09 ft / 4.60 m aft of break)
- Mid (50 %): 15.09 ft / 4.60 m
- Quarterdeck (15 %): 15.09 ft / 4.60 m
- Stern: 15.09 ft / 4.60 m
- Average freeboard: 15.97 ft / 4.87 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 172.7 %
- Above water (accommodation/working, high = better): 73.4 %
Waterplane Area: 9,333 Square feet or 867 Square metres
Displacement factor (Displacement / loading): 79 %
Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.72
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

2

Sunday, June 23rd 2013, 4:09am

RE: New Bharati Ships - 1944

Quoted

Originally posted by The Rock Doctor
So the BNS is altering its approach to minor combattants, with the full endorsement of technocratic elements of the new government. The BNS's "Comprehensive Minor Combattant Program" will operate on a six year schedule, using three specific slipways. The program looks like this:

1944: 6 x destroyer
1945: 6 x coastal sloop/minesweeper
1946: 6 x submarine
1947: 6 x destroyer
1948: 6 x ocean-going sloop
1949: 6 x submarine

Actually, that's a really good idea... I might have to consider something similar for Chile.

Don't really have any comments about the ship, per se. Seems okay.

HoOmAn

Keeper of the Sacred Block Coefficient

  • Send private message

3

Sunday, June 23rd 2013, 9:17am

The programm is a really good approach. Easiy enough to understand and maintain...

Regarding the DD design I wonder if a 50mm faceplate is really required for a DP mount. The mount gets awefully heavy which is not good if it needs to turn around fast when tracking fast aircrafts.

50mm is at the edge of what you need against cruiser size shells but overkill against anything smaller. So why do you think those DDs need such heavily armored mounts?

4

Friday, June 28th 2013, 6:11am

Hm. Going back and looking again at this design, I'm wondering if the beam of this ship is sufficient to mount the twin 57mm guns. I know the French Forbin-class DDs have mounted twin 57mm guns on 12.7m beam, but those guns don't have much room (and no superstructure/funnels/etc) between them. Do you think 11m beam is still sufficient to mount those guns?

5

Friday, June 28th 2013, 2:36pm

I had thought the beam adequate for a pair midships, but that still leaves the question of where the other two would go. Perhaps I wil tinker in Paint and see if it all fits.

6

Friday, June 28th 2013, 4:21pm

I'd be very interested to see the result. :) I had the question of beam in mind back when 1943 started and I transitioned between the French Cimeterre-class destroyers (11.1m beam) and the Forbin-class (12.7m beam) primarily because I was concerned about trying to fit the 57mm guns. It may be splitting hairs, but I was still a bit concerned about the difference.

7

Saturday, June 29th 2013, 4:38pm

Alright, preliminary sketching says I'm being overly ambitious. I can see why earlier drafts either went with 6x57mm or just one torpedo carriage.

8

Wednesday, July 10th 2013, 1:36am

A couple of designs in SS3. If somebody could translate to SS2, that'd be much appreciated.

First up - this little LCM is being built to support police and army operations along Bharat's major rivers. The cargo capacity would support a couple of trucks and some men, or a couple platoons of men, or just a bunch of stuff. In emergency situations, they'd be used to evacuate people in flooded areas.

Enter ship name, Enter country Enter ship type laid down 1944

Displacement:
35 t light; 37 t standard; 38 t normal; 39 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(51.00 ft / 49.21 ft) x 13.12 ft x (2.95 / 2.99 ft)
(15.55 m / 15.00 m) x 4.00 m x (0.90 / 0.91 m)

Armament:
2 - 0.59" / 15.0 mm 45.0 cal guns - 0.10lbs / 0.05kg shells, 15,000 per gun
Machine guns in deck mounts, 1944 Model
2 x Single mounts on sides amidships
Weight of broadside 0 lbs / 0 kg

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

Machinery:
Diesel Internal combustion generators,
Electric motors, 1 shaft, 94 shp / 70 Kw = 10.00 kts
Range 200nm at 10.00 kts
Bunker at max displacement = 1 tons

Complement:
6 - 9

Cost:
£0.011 million / $0.043 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.3 %
- Guns: 0 tons, 0.3 %
Armour: 1 tons, 3.2 %
- Armament: 1 tons, 3.2 %
Machinery: 2 tons, 6.3 %
Hull, fittings & equipment: 11 tons, 29.3 %
Fuel, ammunition & stores: 3 tons, 8.5 %
Miscellaneous weights: 20 tons, 52.4 %
- Hull above water: 20 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
72 lbs / 33 Kg = 697.8 x 0.6 " / 15 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 0.3 ft / 0.1 m
Roll period: 9.7 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.85

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.700 / 0.701
Length to Beam Ratio: 3.75 : 1
'Natural speed' for length: 7.02 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 71
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 4.92 ft / 1.50 m, 4.92 ft / 1.50 m
- Forward deck: 30.00 %, 4.92 ft / 1.50 m, 4.92 ft / 1.50 m
- Aft deck: 35.00 %, 4.92 ft / 1.50 m, 4.92 ft / 1.50 m
- Quarter deck: 15.00 %, 4.92 ft / 1.50 m, 4.92 ft / 1.50 m
- Average freeboard: 4.92 ft / 1.50 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.6 %
- Above water (accommodation/working, high = better): 80.3 %
Waterplane Area: 514 Square feet or 48 Square metres
Displacement factor (Displacement / loading): 144 %
Structure weight / hull surface area: 14 lbs/sq ft or 70 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.81
- Longitudinal: 7.45
- Overall: 1.01
Adequate machinery, storage, compartmentation space
Cramped accommodation and workspace room
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

9

Wednesday, July 10th 2013, 1:42am

A new pair of LSTs will be built to add to the Naval Infrantry's armor and motorization capacity.

The LST rules, as I understand them, mean I can deduct one half of the 600 t miscellaneous weight.

Some excess hull strength provides for resiliency during beaching operations. The draft is not even, but is rather deeper aft than forward.

Enter ship name, Enter country Enter ship type laid down 1944

Displacement:
1,608 t light; 1,662 t standard; 2,288 t normal; 2,790 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(295.28 ft / 295.28 ft) x 49.21 ft x (7.87 / 9.38 ft)
(90.00 m / 90.00 m) x 15.00 m x (2.40 / 2.86 m)

Armament:
4 - 1.38" / 35.0 mm 45.0 cal guns - 1.32lbs / 0.60kg shells, 1,000 per gun
Anti-air guns in deck mounts, 1944 Model
2 x Twin mounts on centreline, evenly spread
2 raised mounts
8 - 0.59" / 15.0 mm 45.0 cal guns - 0.10lbs / 0.05kg shells, 10,000 per gun
Machine guns in deck mounts, 1944 Model
2 x 2 row quad mounts on sides, forward deck aft
2 raised mounts
2 - 0.31" / 8.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 10,000 per gun
Machine guns in deck mounts, 1944 Model
2 x Single mounts on sides, forward deck forward
Weight of broadside 6 lbs / 3 kg

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm - -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 4,249 shp / 3,170 Kw = 16.82 kts
Range 5,000 nm @ 12.00 kts
Bunker at max displacement = 282 tons
(simmed as: Range 20,000nm at 12.00 kts
Bunker at max displacement = 1,128 tons)

Complement:
165 - 215

Cost:
£0.485 million / $1.938 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.1 %
- Guns: 2 tons, 0.1 %
Armour: 4 tons, 0.2 %
- Armament: 4 tons, 0.2 %
Machinery: 109 tons, 4.7 %
Hull, fittings & equipment: 894 tons, 39.1 %
Fuel, ammunition & stores: 680 tons, 29.7 %
Miscellaneous weights: 600 tons, 26.2 %
- Hull above water: 600 tons
-980 t: Vehicles and cargo (includes 796 t simmed as bunkerage)
-400 t: Accommodation for 200 personnel
-50 t: Vehicle fuel and stores (simmed as bunkerage)
-16 t: Weight reserve
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,000 lbs / 4,536 Kg = 7,644.2 x 1.4 " / 35 mm shells or 2.7 torpedoes
Stability (Unstable if below 1.00): 1.61
Metacentric height 3.8 ft / 1.2 m
Roll period: 10.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.85

Hull form characteristics:
Hull has raised forecastle,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.700 / 0.716
Length to Beam Ratio: 6.00 : 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 19.36 ft / 5.90 m, 19.36 ft / 5.90 m
- Forward deck: 30.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Aft deck: 35.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Quarter deck: 15.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- Average freeboard: 15.68 ft / 4.78 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 45.7 %
- Above water (accommodation/working, high = better): 198.5 %
Waterplane Area: 11,647 Square feet or 1,082 Square metres
Displacement factor (Displacement / loading): 277 %
Structure weight / hull surface area: 57 lbs/sq ft or 279 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 2.11
- Overall: 1.08
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

10

Wednesday, July 10th 2013, 3:09am

Quoted

Originally posted by The Rock Doctor
First up - this little LCM is being built to support police and army operations along Bharat's major rivers. The cargo capacity would support a couple of trucks and some men, or a couple platoons of men, or just a bunch of stuff. In emergency situations, they'd be used to evacuate people in flooded areas.

A good choice of design, I think. Historically, the French found these sorts of boats quite useful as combat vessels in Indochina, and I've been building a slightly larger variant, the EDA-55, to follow the historical methodology.

11

Wednesday, July 10th 2013, 3:11am

Thanks. I'm eyeballing a couple dozen over the next few years. They can be fit into the schedule easily enough.

12

Saturday, August 17th 2013, 3:15am

People don't just die from drowning during a major flood event. They can be seriously injured by debris in fast-moving waters, can get sick if forced to drink the flood waters, and could be bitten by snakes seeking refuge in the same dry places as the victim.

In such situations, prompt medical attention is necessary to ensure survival - yet the options on previous occasions was either early first aid on a small craft or proper medical attention several hours to days later at a distant, dry army field hospital or one of the few ships with medical facilities anchored offshore. Too often, the former was insufficient and the latter too much delayed.

This new class of hospital riverboat is intended to provide forward medical attention right in the middle of affected areas. In non-emergency situations, they might be employed to provide more routine medical services to particularly isolated communities along Bharat's major rivers.

A production run of twelve or more is envisioned.

River Hospital Boat, Enter country Enter ship type laid down 1944

Displacement:
196 t light; 200 t standard; 206 t normal; 211 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(150.19 ft / 147.64 ft) x 26.25 ft x (2.95 / 3.01 ft)
(45.78 m / 45.00 m) x 8.00 m x (0.90 / 0.92 m)

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 201 shp / 150 Kw = 10.40 kts
Range 1,000nm at 10.00 kts
Bunker at max displacement = 11 tons

Complement:
26 - 35

Cost:
£0.051 million / $0.204 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 5 tons, 2.5 %
Hull, fittings & equipment: 85 tons, 41.5 %
Fuel, ammunition & stores: 10 tons, 5.0 %
Miscellaneous weights: 105 tons, 51.0 %
- Hull above water: 105 tons
-40 t: Accommodation for 20 medical and security personnel as required.
-50 t: Medical facilities (1 operating table, small emergency/triage area, pharmacy)
-15 t: Weight reserve / deck cargo

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
646 lbs / 293 Kg = 6.0 x 6 " / 152 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.55
Metacentric height 1.4 ft / 0.4 m
Roll period: 9.3 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.630 / 0.632
Length to Beam Ratio: 5.63 : 1
'Natural speed' for length: 12.15 kts
Power going to wave formation at top speed: 35 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 9.51 ft / 2.90 m, 5.58 ft / 1.70 m
- Forward deck: 30.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Aft deck: 35.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Quarter deck: 15.00 %, 5.58 ft / 1.70 m, 5.58 ft / 1.70 m
- Average freeboard: 5.89 ft / 1.80 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64.3 %
- Above water (accommodation/working, high = better): 119.1 %
Waterplane Area: 2,914 Square feet or 271 Square metres
Displacement factor (Displacement / loading): 179 %
Structure weight / hull surface area: 24 lbs/sq ft or 119 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.27
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Adequate accommodation and workspace room

[If somebody wishes to convert this to SS2.0, that'd be awesome and appreciated]

13

Saturday, August 17th 2013, 3:24am

Interesting and intriguingly novel.

14

Saturday, August 17th 2013, 3:25am

Thanks. I think I'm having more fun designing auxiliaries than warships these days.

15

Saturday, August 17th 2013, 3:40am

Quoted

Originally posted by The Rock Doctor
Thanks. I think I'm having more fun designing auxiliaries than warships these days.


An interesting development given the unfortunate risk of monsoon-induced floods and tropical cyclones that Bharat faces. It certainly speaks to the concern the Government has for the welfare of its citizens.

16

Tuesday, September 10th 2013, 10:13pm

Went back and re-jigged the Rawalpindis. As Brock had indicated, getting everything on to the hull in question was an iffy proposition given that I was setting aside "B" position for the Mangus ASW system.

So I ended up tossing a torpedo carriage and reducing two of the 57mm guns from twins to singles.

I can probably find room on either side of the aft funnel for torpedo reloads, which would be reasonable given that there's only one carriage on the boat.

The sketch below is preliminary and incomplete, but you get the idea.



Enter ship name, Enter country Enter ship type laid down 1944

Displacement:
2,091 t light; 2,222 t standard; 2,546 t normal; 2,805 t full load

Dimensions: Length overall / water x beam x draught
390.74 ft / 379.10 ft x 42.65 ft x 13.12 ft (normal load)
119.10 m / 115.55 m x 13.00 m x 4.00 m

Armament:
6 - 4.92" / 125 mm guns (3x2 guns), 59.59lbs / 27.03kg shells, 1944 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority aft, 1 raised mount aft - superfiring
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1944 Model
Dual purpose guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1944 Model
Dual purpose guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0.98" / 25.0 mm guns (4x2 guns), 0.48lbs / 0.22kg shells, 1944 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 395 lbs / 179 kg
Shells per gun, main battery: 350
5 - 21.7" / 550 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.98" / 25 mm 0.39" / 10 mm -
4th: 0.98" / 25 mm 0.39" / 10 mm -
5th: 0.39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 48,258 shp / 36,000 Kw = 34.38 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 583 tons

Complement:
178 - 232

Cost:
£1.837 million / $7.347 million

Distribution of weights at normal displacement:
Armament: 49 tons, 1.9 %
Armour: 30 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 30 tons, 1.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,131 tons, 44.4 %
Hull, fittings & equipment: 738 tons, 29.0 %
Fuel, ammunition & stores: 455 tons, 17.9 %
Miscellaneous weights: 142 tons, 5.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
811 lbs / 368 Kg = 13.6 x 4.9 " / 125 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 2.0 ft / 0.6 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.35
Seaboat quality (Average = 1.00): 0.87

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.420
Length to Beam Ratio: 8.89 : 1
'Natural speed' for length: 22.68 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (20 %): 19.03 ft / 5.80 m
- Mid (50 %): 15.09 ft / 4.60 m
- Quarterdeck (15 %): 15.09 ft / 4.60 m
- Stern: 15.09 ft / 4.60 m
- Average freeboard: 16.78 ft / 5.12 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 166.4 %
- Above water (accommodation/working, high = better): 138.6 %
Waterplane Area: 10,465 Square feet or 972 Square metres
Displacement factor (Displacement / loading): 84 %
Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.67
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

HoOmAn

Keeper of the Sacred Block Coefficient

  • Send private message

17

Tuesday, September 10th 2013, 11:27pm

Nice.

Some points:
- Your boats look quite small. I think you should use larger templates.
- Have you tried raked funnels?
- No bridge wings? A missing detail or intention? Might make ship operations more difficult.
- Her main mast could be a bit higher for looks.
- Are you sure there is not enough room for 57mm twins abreast her forward funnel? I would think there is. You do not need that much deck space to walk around those mounts.

18

Wednesday, September 11th 2013, 1:08am

I think the boat's 21' as drawn. It can be enlarged.

I don't tend to draw raked funnels very well. What's the operational utility of them?

I had the impression bridge wings were omitted from post-war DD designs, though that could be mistaken. I am a bit concerned about such things blocking the forward 57mm's line of fire.

Noted on the mast.

I'm open to suggestion about the forward 57mm being single or twin. The mounting weight won't be an issue, I'll just tweak elsewhere. It's whether there's deck space.

19

Monday, October 7th 2013, 7:33pm

FYI - I tinkered with the destroyer yet again. See the encyclopedia for final details. An illustration of the USS Forest Sherman was helpful in sorting things out.

Ahem...

Bharat would like to take the two Ramree Island class oilers out of active service; they're getting old, and having been refitted. If they remain active, it will be as tankers moving fuel between harbours rather than as support vessels.

Their replacements will be mid-sized ships, with some ability to transfer dry stores in addition to fuel. They'll have some utility in supporting small surface groups - patrol groups, etc.

Enter ship name, Enter country Enter ship type laid down 1944

Displacement:
3,973 t light; 4,146 t standard; 8,075 t normal; 11,218 t full load

Dimensions: Length overall / water x beam x draught
437.58 ft / 426.51 ft x 59.06 ft x 18.70 ft (normal load)
133.38 m / 130.00 m x 18.00 m x 5.70 m

Armament:
1 - 4.92" / 125 mm guns in single mounts, 59.59lbs / 27.03kg shells, 1944 Model
Dual purpose gun in a deck mount with hoist
on centreline aft, 1 raised gun
2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1944 Model
Dual purpose guns in deck mount
on centreline amidships, all raised guns - superfiring
8 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1944 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 75 lbs / 34 kg
Shells per gun, main battery: 250

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:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 13,404 shp / 10,000 Kw = 19.74 kts
Range 40,000nm at 15.00 kts
Bunker at max displacement = 7,072 tons

Complement:
425 - 553

Cost:
£1.311 million / $5.242 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0.1 %
Armour: 7 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 7 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 342 tons, 4.2 %
Hull, fittings & equipment: 2,108 tons, 26.1 %
Fuel, ammunition & stores: 4,102 tons, 50.8 %
Miscellaneous weights: 1,506 tons, 18.7 %
-1,150 t: Dry stores and cargo
-200 t: UNREP gear
-100 t: 1 x 50 t crane and 2 x 25 t cranes
-25 t: Medical facilities
-20 t: Accommodation for 10 passengers
-11 t: Weight reserve

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
29,150 lbs / 13,222 Kg = 489.2 x 4.9 " / 125 mm shells or 4.9 torpedoes
Stability (Unstable if below 1.00): 1.50
Metacentric height 4.5 ft / 1.4 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
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: 7.22 : 1
'Natural speed' for length: 20.65 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 25.59 ft / 7.80 m
- Forecastle (20 %): 22.64 ft / 6.90 m (14.76 ft / 4.50 m aft of break)
- Mid (60 %): 14.76 ft / 4.50 m (22.64 ft / 6.90 m aft of break)
- Quarterdeck (15 %): 14.76 ft / 4.50 m (22.64 ft / 6.90 m before break)
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 18.54 ft / 5.65 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 36.4 %
- Above water (accommodation/working, high = better): 146.9 %
Waterplane Area: 18,422 Square feet or 1,711 Square metres
Displacement factor (Displacement / loading): 355 %
Structure weight / hull surface area: 75 lbs/sq ft or 366 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.69
- 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

20

Monday, October 7th 2013, 7:35pm

Bharat has ocean-going tugs - four of them - but they're probably kind of old. Difficult to say for sure since I can't find actual sims for them.

A new class will be laid down to civilian standards to support blue-water salvage and other duties...

Enter ship name, Enter country Enter ship type laid down 1944

Displacement:
795 t light; 820 t standard; 999 t normal; 1,142 t full load

Dimensions: Length overall / water x beam x draught
200.13 ft / 196.85 ft x 36.09 ft x 9.84 ft (normal load)
61.00 m / 60.00 m x 11.00 m x 3.00 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1944 Model
Breech loading gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1944 Model
Breech loading guns in deck mounts
on side, all amidships
Weight of broadside 36 lbs / 16 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion generators,
Electric motors, 1 shaft, 4,021 shp / 3,000 Kw = 18.69 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 322 tons

Complement:
88 - 115

Cost:
£0.310 million / $1.238 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.5 %
Armour: 3 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 103 tons, 10.3 %
Hull, fittings & equipment: 485 tons, 48.6 %
Fuel, ammunition & stores: 204 tons, 20.4 %
Miscellaneous weights: 200 tons, 20.0 %
-150 t: Towing gear
-50 t: Weight reserve

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,551 lbs / 1,157 Kg = 72.2 x 4.1 " / 105 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 1.5 ft / 0.4 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.65

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 5.45 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 31
Bow angle (Positive = bow angles forward): 0.00 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 %): 17.06 ft / 5.20 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 14.82 ft / 4.52 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 59.9 %
- Above water (accommodation/working, high = better): 138.2 %
Waterplane Area: 4,550 Square feet or 423 Square metres
Displacement factor (Displacement / loading): 225 %
Structure weight / hull surface area: 59 lbs/sq ft or 286 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.13
- Longitudinal: 8.41
- Overall: 1.38
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