WesWorld

I don't currently have access to SS2, so would appreciate some help.

http://www.jk-clan.de/wbblite/thread.php…70813#post70813

There's a Bharati LST in the Indian encyclopedia, and I note that Perd's got surplus hull strength but no miscellaneous weight. I'd kinda like to re-sim it to 1.00 hull strength and see how much miscellaneous weight is possible, so I know what this ship can lift. Would anybody have time to sim this for me?

Thanks...

Some fudging went on with the engines, or he was using a different version of springsharp than mine, but the differences are negligable (mine simmed 5 tons heavier, with a couple of outlier numbers elsewhere);

LST-1, Indian LST laid down 1936

Displacement:
1,301 t light; 1,358 t standard; 1,556 t normal; 1,715 t full load

Dimensions: Length overall / water x beam x draught
334.78 ft / 328.08 ft x 50.00 ft x 5.58 ft (normal load)
102.04 m / 100.00 m x 15.24 m x 1.70 m

Armament:
6 - 1.38" / 35.0 mm guns (3x2 guns), 1.30lbs / 0.59kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all aft
6 - 1.38" / 35.0 mm guns (2x3 guns), 1.31lbs / 0.59kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all forward
6 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1936 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 16 lbs / 7 kg
Shells per gun, main battery: 2,000

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 150.10 ft / 45.75 m 8.50 ft / 2.59 m
Ends: Unarmoured
Main Belt covers 70 % of normal length

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,374 shp / 1,025 Kw = 13.40 kts
Range 11,000nm at 10.00 kts
Bunker at max displacement = 357 tons

Complement:
123 - 161

Cost:
£0.278 million / $1.110 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.1 %
Armour: 167 tons, 10.8 %
- Belts: 167 tons, 10.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 39 tons, 2.5 %
Hull, fittings & equipment: 831 tons, 53.4 %
Fuel, ammunition & stores: 255 tons, 16.4 %
Miscellaneous weights: 262 tons, 16.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,826 lbs / 6,271 Kg = 10,569.0 x 1.4 " / 35 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.32
Metacentric height 2.9 ft / 0.9 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.56

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.595
Length to Beam Ratio: 6.56 : 1
'Natural speed' for length: 21.18 kts
Power going to wave formation at top speed: 27 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.41 ft / 5.61 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (50 %): 16.40 ft / 5.00 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 16.56 ft / 5.05 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 30.6 %
- Above water (accommodation/working, high = better): 316.1 %
Waterplane Area: 12,445 Square feet or 1,156 Square metres
Displacement factor (Displacement / loading): 298 %
Structure weight / hull surface area: 51 lbs/sq ft or 251 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.07
- 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

Thanks, Shin.

Can't say the cargo capacity really impresses me that much. I wonder if he intended to use some of that bunkerage to represent payload...

Edit: Whoa - armor belt? That must be a cargo substitution...

Quoted

Originally posted by The Rock Doctor
Thanks, Shin.

Can't say the cargo capacity really impresses me that much. I wonder if he intended to use some of that bunkerage to represent payload...

Edit: Whoa - armor belt? That must be a cargo substitution...

Yeah, I'd say so. There is no doubt that it was designed before the latest set of rules for LSTs was decided upon. Something that large ought to have far greater carrying capacity.

When we discussed the concept of LSTs, and Perdy designed those ships, we discussed the proper way of simming landing ships. IIRC, Perdy took the position that simming ships with miscellaneous weight on them resulted in vessels with improper stability and steadiness. We agreed that just using excess hull strength and armoured belts was a viable way to sim landing ships. (I note that only Perdy, to the best of my knowledge, ever simmed ships this way - nevertheless I believe we did green-light it's use.)

I've edited the Encyclopedia to use Shin's sim as "official".

Bumped for another request, as I can't get SS2 on this machine.

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

Displacement:
2,038 t light; 2,189 t standard; 2,519 t normal; 2,782 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(400.46 ft / 393.54 ft) x 36.09 ft x (14.11 / 15.10 ft)
(122.06 m / 119.95 m) x 11.00 m x (4.30 / 4.60 m)

Armament:
6 - 4.92" / 125 mm 45.0 cal guns - 60.10lbs / 27.26kg shells, 400 per gun
Dual purpose guns in deck and hoist mounts, 1944 Model
2 x Twin mounts on centreline, aft evenly spread
1 raised mount aft
1 x Twin mount on centreline, forward deck centre
1 raised mount
8 - 2.24" / 57.0 mm 45.0 cal guns - 5.71lbs / 2.59kg shells, 800 per gun
Anti-air guns in deck mounts, 1944 Model
2 x Twin mounts on sides, forward deck aft
2 x Twin mounts on centreline, aft evenly spread
2 raised mounts
8 - 0.59" / 15.0 mm 45.0 cal guns - 0.11lbs / 0.05kg shells, 1,000 per gun
Machine guns in deck mounts, 1944 Model
4 x Twin mounts on sides, evenly spread
4 raised mounts
Weight of broadside 407 lbs / 185 kg
Main Torpedoes
10 - 21.7" / 550 mm, 22.97 ft / 7.00 m torpedoes - 1.660 t each, 16.601 t total
In 2 sets of deck mounted carriage/fixed tubes

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,
Direct drive, 2 shafts, 48,258 shp / 36,000 Kw = 34.54 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 593 tons

Complement:
177 - 231

Cost:
£1.806 million / $7.223 million

Distribution of weights at normal displacement:
Armament: 112 tons, 4.4 %
- Guns: 91 tons, 3.6 %
- Weapons: 21 tons, 0.8 %
Armour: 32 tons, 1.3 %
- Armament: 32 tons, 1.3 %
Machinery: 1,143 tons, 45.4 %
Hull, fittings & equipment: 671 tons, 26.6 %
Fuel, ammunition & stores: 481 tons, 19.1 %
Miscellaneous weights: 80 tons, 3.2 %
- Hull above water: 80 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
712 lbs / 323 Kg = 11.9 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.15
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): 0.69
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has raised forecastle,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.440 / 0.454
Length to Beam Ratio: 10.90 : 1
'Natural speed' for length: 22.65 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 20.67 ft / 6.30 m, 18.70 ft / 5.70 m
- Forward deck: 30.00 %, 15.09 ft / 4.60 m, 15.09 ft / 4.60 m
- Aft deck: 35.00 %, 15.09 ft / 4.60 m, 15.09 ft / 4.60 m
- Quarter deck: 15.00 %, 15.09 ft / 4.60 m, 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): 166.6 %
- Above water (accommodation/working, high = better): 144.9 %
Waterplane Area: 9,333 Square feet or 867 Square metres
Displacement factor (Displacement / loading): 86 %
Structure weight / hull surface area: 39 lbs/sq ft or 188 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.78
- Overall: 0.56
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room

This is coming pretty close. I had to bring the speed down to a flat 34 knots to get the hull strength back in line.

You sure you want direct drives rather than geared?

Quoted

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

Displacement:
2,074 t light; 2,220 t standard; 2,519 t normal; 2,758 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,
Direct drive, 2 shafts, 53,378 shp / 39,820 Kw = 34.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 538 tons

Complement:
177 - 231

Cost:
£1.906 million / $7.626 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: 1,203 tons, 47.8 %
Hull, fittings & equipment: 710 tons, 28.2 %
Fuel, ammunition & stores: 445 tons, 17.6 %
Miscellaneous weights: 80 tons, 3.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
632 lbs / 287 Kg = 10.6 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.62
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.440
Length to Beam Ratio: 10.90 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 67
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): 175.6 %
- Above water (accommodation/working, high = better): 70.7 %
Waterplane Area: 8,987 Square feet or 835 Square metres
Displacement factor (Displacement / loading): 78 %
Structure weight / hull surface area: 38 lbs/sq ft or 188 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.72
- Overall: 0.57
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

Probably want geared drives. It never actually affects the sim so I get lazy about that spot.

Can I ask you to add a transom stern, then see what an even 40,000 KW does for the speed?

If there's extra hull strength after that, it can go to miscellaneous weight.

Thanks very much!

Hrm, seem to have missed the transom stern. Sloppy of me.

Had to do some tweaking of speed to get your power requirements. Is *that* why everybody always makes their ships with XX.04 knots or something of speed?

Quoted

Enter ship name, Enter country Enter ship type 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, 53,619 shp / 40,000 Kw = 35.43 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 509 tons

Complement:
177 - 231

Cost:
£1.913 million / $7.653 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: 1,206 tons, 47.9 %
Hull, fittings & equipment: 723 tons, 28.7 %
Fuel, ammunition & stores: 428 tons, 17.0 %
Miscellaneous weights: 80 tons, 3.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
630 lbs / 286 Kg = 10.6 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 1.3 ft / 0.4 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 0.93

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: 68 %
Trim (Max stability = 0, Max steadiness = 100): 75
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): 176.0 %
- Above water (accommodation/working, high = better): 73.4 %
Waterplane Area: 9,334 Square feet or 867 Square metres
Displacement factor (Displacement / loading): 77 %
Structure weight / hull surface area: 39 lbs/sq ft or 190 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.76
- Overall: 0.57
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
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

That's why I do it - the assumption that the builders install a couple of nice 20,000 KW powerplants rather than a 20,000 KW and a 18,989 KW powerplant.

Thanks for the re-sim. Gives me a good baseline to contemplate before 1944 hits us.

And the light-bulb goes on. I never saw the reasons why folks did that, and never thought to ask. Makes sense... though I do kinda prefer the simplicity of round numbers. *Shrugs*

Your welcome, glad to be of help.

Okay, a couple of revisions if you're still game:

-Tweak the machinery down to 38,000 KW, then increase miscellaneous weight until hull strength is at its limit.

-Resim again with 36,000 KW and repeat.

I'm pretty happy with the other parameters of the design; it's mainly the speed/MW trade-off that I'm not yet sure of.

Thanks again!

Rev 2 and 3. I didn't adjust trim much on Rev 2, but I felt the stability on Rev 3 was dipping too low. As a result I traded steadiness in to bring it back up for you. (My rule of thumb is no stability under 1.10 except in special circumstances, hence my tweak.) I saved the revisions this time so if you need any more slight variations, I can make the changes quickly.

At 38,000:

Quoted

Rev 2, 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 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
634 lbs / 288 Kg = 10.6 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 1.2 ft / 0.4 m
Roll period: 13.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.67
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): 73
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
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

At 36,000:

Quoted

Rev 3, 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, 48,258 shp / 36,000 Kw = 34.54 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 509 tons

Complement:
177 - 231

Cost:
£1.825 million / $7.301 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: 1,113 tons, 44.2 %
Hull, fittings & equipment: 701 tons, 27.8 %
Fuel, ammunition & stores: 428 tons, 17.0 %
Miscellaneous weights: 195 tons, 7.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
675 lbs / 306 Kg = 11.3 x 4.9 " / 125 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.3 ft / 0.4 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 63 %
- Recoil effect (Restricted arc if above 1.00): 0.62
Seaboat quality (Average = 1.00): 0.99

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: 66 %
Trim (Max stability = 0, Max steadiness = 100): 64
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): 169.0 %
- Above water (accommodation/working, high = better): 73.4 %
Waterplane Area: 9,333 Square feet or 867 Square metres
Displacement factor (Displacement / loading): 81 %
Structure weight / hull surface area: 38 lbs/sq ft or 184 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.71
- 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

Sorry, didn't occur to me that you'd have to re-sim.

I imagine 145 t is plenty for a destroyer, so can I ask you to adjust trim on #2 so that steadiness is 60%? I imagine the stability would wander up to around 1.15 or so, which be just fine.

Thanks...

Quoted

Originally posted by The Rock Doctor
Sorry, didn't occur to me that you'd have to re-sim.

I imagine 145 t is plenty for a destroyer, so can I ask you to adjust trim on #2 so that steadiness is 60%? I imagine the stability would wander up to around 1.15 or so, which be just fine.

Thanks...

And for some reason it didn't occur to me to save my file. I get antsy when I have too many windows open on my computer, so I accidentally closed it without saving...

Quoted

Rev 2, 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 %

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

Thanks. I suspect that'll be the 1944 Bharati destroyer class.

Quoted

Originally posted by Brockpaine
And the light-bulb goes on. I never saw the reasons why folks did that, and never thought to ask. Makes sense... though I do kinda prefer the simplicity of round numbers. *Shrugs*

Your welcome, glad to be of help.

That's why I do that too. I like to see what the HP can provide and work around that. Very often designers like the Admiralty DNC were tied to things like power output as to what speeds they can get (especially as packaged units like YARD came on line). It's a bugger when designing on SS as you have to keep adjusting the HP every time you adjust the block coefficient etc., but at least it shows you what affect hull and weight changes have rather than plugging in 32kts and SS automatically adjusting the HP for you and then losing track of exactly how much the machinery is growing in size and weight. Also, if you have 34,000shp and you get 32.7444 knots then you know you've a bit left over for deep and dirty speeds. Plain 32kts is just that without having anything left in reserve as the hull dirties or in the tropics.