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A few comments on the new designs posted in the Thai encyclopedia

CL Taksin - the main battery specifies breechloading guns; is this correct? At this point in time I would have expected at least quick-firing guns, though perhaps not automatics. Also the secondary battery has six dual purpose guns but specifies four single mounts...

CV Rachan - the primary AA battery of eight 76mm guns specifies four single mounts... and it looked as if some of the ship's dimensions were omitted. We normally sim in Springsharp 2.0 rather than 3.0, and that could have thrown me.

CL Taksin - the main battery specifies breechloading guns; is this correct? At this point in time I would have expected at least quick-firing guns, though perhaps not automatics. Also the secondary battery has six dual purpose guns but specifies four single mounts...

CV Rachan - the primary AA battery of eight 76mm guns specifies four single mounts... and it looked as if some of the ship's dimensions were omitted. We normally sim in Springsharp 2.0 rather than 3.0, and that could have thrown me.

I just checked.....and yes I was using Springsharp 3 rather than 2. After I re-installed 2. *facepalm*. I'll re-sim the ships in 2 so everything is kosher, and edit the appropriate posts.

I just checked.....and yes I was using Springsharp 3 rather than 2. After I re-installed 2. *facepalm*. I'll re-sim the ships in 2 so everything is kosher, and edit the appropriate posts.

I quite understand. As I said, they were minor things. We usually post new designs in this folder for comment for just that reason - we all make mistakes, and often comments can result in design improvements. We generally regard Encyclopedia posts as sacrosanct and not comment there.

Eh, well the sacrosanct will be getting an edit when I'm done.

Specifically I'm definitely going to be building 3 new small cruisers and a new carrier. Plus a run of destroyers if I can get springsharp to cooperate with me.

I meant sacrosanct from the viewpoint of other players; the owning player can (and should) edit or add as he see fit. This is to avoid comments cluttering up the encyclopedias.

Rachan, Thailand Aircraft Carrier laid down 1948

Displacement:

8,036 t light; 8,226 t standard; 8,634 t normal; 8,961 t full load

Dimensions: Length overall / water x beam x draught

555.00 ft / 555.00 ft x 55.00 ft x 18.00 ft (normal load)

169.16 m / 169.16 m x 16.76 m x 5.49 m

Armament:

8 - 2.99" / 76.0 mm guns in single mounts, 13.39lbs / 6.08kg shells, 1948 Model

Anti-aircraft guns in deck mounts with hoists

on side, evenly spread, all raised mounts

32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.89kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

Weight of broadside 170 lbs / 77 kg

Shells per gun, main battery: 150

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 1.97" / 50 mm 410.11 ft / 125.00 m 9.84 ft / 3.00 m

Ends: Unarmoured

Main Belt covers 114 % of normal length

Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:

2.36" / 60 mm 410.11 ft / 125.00 m 13.12 ft / 4.00 m

- Armour deck: 2.99" / 76 mm, Conning tower: 2.99" / 76 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 4 shafts, 54,676 shp / 40,788 Kw = 30.00 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 734 tons

Complement:

447 - 582

Cost:

£3.624 million / $14.496 million

Distribution of weights at normal displacement:

Armament: 21 tons, 0.2 %

Armour: 2,050 tons, 23.7 %

- Belts: 325 tons, 3.8 %

- Torpedo bulkhead: 470 tons, 5.4 %

- Armament: 0 tons, 0.0 %

- Armour Deck: 1,228 tons, 14.2 %

- Conning Tower: 27 tons, 0.3 %

Machinery: 1,336 tons, 15.5 %

Hull, fittings & equipment: 2,629 tons, 30.4 %

Fuel, ammunition & stores: 598 tons, 6.9 %

Miscellaneous weights: 2,000 tons, 23.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

12,616 lbs / 5,722 Kg = 941.9 x 3.0 " / 76 mm shells or 2.3 torpedoes

Stability (Unstable if below 1.00): 1.07

Metacentric height 2.3 ft / 0.7 m

Roll period: 15.2 seconds

Steadiness - As gun platform (Average = 50 %): 54 %

- Recoil effect (Restricted arc if above 1.00): 0.05

Seaboat quality (Average = 1.00): 1.08

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 10.09 : 1

'Natural speed' for length: 26.72 kts

Power going to wave formation at top speed: 55 %

Trim (Max stability = 0, Max steadiness = 100): 50

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.91 ft / 7.90 m

- Forecastle (20 %): 16.49 ft / 5.03 m

- Mid (50 %): 16.49 ft / 5.03 m

- Quarterdeck (15 %): 16.49 ft / 5.03 m

- Stern: 16.49 ft / 5.03 m

- Average freeboard: 17.24 ft / 5.26 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 122.6 %

- Above water (accommodation/working, high = better): 155.8 %

Waterplane Area: 22,178 Square feet or 2,060 Square metres

Displacement factor (Displacement / loading): 125 %

Structure weight / hull surface area: 78 lbs/sq ft or 383 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.99

- Longitudinal: 1.04

- Overall: 1.00

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is excellent

50t Misc Weight, Radars

1600t Misc Weight, Hangar and flight deck accomodations (2 catapults, 2 elevators) for 30 aircraft (Jet or Prop)

150t Misc Weight, Aviation Ordnance

Displacement:

8,036 t light; 8,226 t standard; 8,634 t normal; 8,961 t full load

Dimensions: Length overall / water x beam x draught

555.00 ft / 555.00 ft x 55.00 ft x 18.00 ft (normal load)

169.16 m / 169.16 m x 16.76 m x 5.49 m

Armament:

8 - 2.99" / 76.0 mm guns in single mounts, 13.39lbs / 6.08kg shells, 1948 Model

Anti-aircraft guns in deck mounts with hoists

on side, evenly spread, all raised mounts

32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.89kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side, evenly spread, all raised mounts

Weight of broadside 170 lbs / 77 kg

Shells per gun, main battery: 150

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 1.97" / 50 mm 410.11 ft / 125.00 m 9.84 ft / 3.00 m

Ends: Unarmoured

Main Belt covers 114 % of normal length

Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:

2.36" / 60 mm 410.11 ft / 125.00 m 13.12 ft / 4.00 m

- Armour deck: 2.99" / 76 mm, Conning tower: 2.99" / 76 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 4 shafts, 54,676 shp / 40,788 Kw = 30.00 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 734 tons

Complement:

447 - 582

Cost:

£3.624 million / $14.496 million

Distribution of weights at normal displacement:

Armament: 21 tons, 0.2 %

Armour: 2,050 tons, 23.7 %

- Belts: 325 tons, 3.8 %

- Torpedo bulkhead: 470 tons, 5.4 %

- Armament: 0 tons, 0.0 %

- Armour Deck: 1,228 tons, 14.2 %

- Conning Tower: 27 tons, 0.3 %

Machinery: 1,336 tons, 15.5 %

Hull, fittings & equipment: 2,629 tons, 30.4 %

Fuel, ammunition & stores: 598 tons, 6.9 %

Miscellaneous weights: 2,000 tons, 23.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

12,616 lbs / 5,722 Kg = 941.9 x 3.0 " / 76 mm shells or 2.3 torpedoes

Stability (Unstable if below 1.00): 1.07

Metacentric height 2.3 ft / 0.7 m

Roll period: 15.2 seconds

Steadiness - As gun platform (Average = 50 %): 54 %

- Recoil effect (Restricted arc if above 1.00): 0.05

Seaboat quality (Average = 1.00): 1.08

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 10.09 : 1

'Natural speed' for length: 26.72 kts

Power going to wave formation at top speed: 55 %

Trim (Max stability = 0, Max steadiness = 100): 50

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.91 ft / 7.90 m

- Forecastle (20 %): 16.49 ft / 5.03 m

- Mid (50 %): 16.49 ft / 5.03 m

- Quarterdeck (15 %): 16.49 ft / 5.03 m

- Stern: 16.49 ft / 5.03 m

- Average freeboard: 17.24 ft / 5.26 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 122.6 %

- Above water (accommodation/working, high = better): 155.8 %

Waterplane Area: 22,178 Square feet or 2,060 Square metres

Displacement factor (Displacement / loading): 125 %

Structure weight / hull surface area: 78 lbs/sq ft or 383 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.99

- Longitudinal: 1.04

- Overall: 1.00

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is excellent

50t Misc Weight, Radars

1600t Misc Weight, Hangar and flight deck accomodations (2 catapults, 2 elevators) for 30 aircraft (Jet or Prop)

150t Misc Weight, Aviation Ordnance

Displacement:

4,560 t light; 4,749 t standard; 5,038 t normal; 5,270 t full load

Dimensions: Length overall / water x beam x draught

475.00 ft / 475.00 ft x 45.00 ft x 15.00 ft (normal load)

144.78 m / 144.78 m x 13.72 m x 4.57 m

Armament:

6 - 5.91" / 150 mm guns (3x2 guns), 102.98lbs / 46.71kg shells, 1948 Model

Quick firing guns in turrets (on barbettes)

on centreline ends, majority forward, all raised mounts - superfiring

6 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1948 Model

Dual purpose guns in deck mounts with hoists

on side, evenly spread, all raised mounts

16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side ends, evenly spread, all raised mounts - superfiring

Weight of broadside 965 lbs / 438 kg

Shells per gun, main battery: 150

8 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 1.97" / 50 mm 393.70 ft / 120.00 m 6.56 ft / 2.00 m

Ends: Unarmoured

Main Belt covers 128 % of normal length

Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead:

2.36" / 60 mm 393.70 ft / 120.00 m 9.84 ft / 3.00 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 2.95" / 75 mm 1.06" / 27 mm 2.95" / 75 mm

2nd: 1.97" / 50 mm 1.06" / 27 mm 1.57" / 40 mm

- Armour deck: 1.06" / 27 mm, Conning tower: 2.99" / 76 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 41,396 shp / 30,882 Kw = 30.00 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 521 tons

Complement:

298 - 388

Cost:

£3.001 million / $12.005 million

Distribution of weights at normal displacement:

Armament: 121 tons, 2.4 %

Armour: 1,053 tons, 20.9 %

- Belts: 204 tons, 4.0 %

- Torpedo bulkhead: 339 tons, 6.7 %

- Armament: 185 tons, 3.7 %

- Armour Deck: 305 tons, 6.1 %

- Conning Tower: 19 tons, 0.4 %

Machinery: 1,012 tons, 20.1 %

Hull, fittings & equipment: 2,275 tons, 45.2 %

Fuel, ammunition & stores: 478 tons, 9.5 %

Miscellaneous weights: 100 tons, 2.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

7,528 lbs / 3,415 Kg = 73.1 x 5.9 " / 150 mm shells or 1.5 torpedoes

Stability (Unstable if below 1.00): 1.04

Metacentric height 1.6 ft / 0.5 m

Roll period: 14.8 seconds

Steadiness - As gun platform (Average = 50 %): 56 %

- Recoil effect (Restricted arc if above 1.00): 0.87

Seaboat quality (Average = 1.00): 1.12

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 10.56 : 1

'Natural speed' for length: 24.64 kts

Power going to wave formation at top speed: 59 %

Trim (Max stability = 0, Max steadiness = 100): 50

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.00 ft / 7.62 m

- Forecastle (20 %): 21.00 ft / 6.40 m

- Mid (50 %): 17.00 ft / 5.18 m

- Quarterdeck (15 %): 15.00 ft / 4.57 m

- Stern: 15.00 ft / 4.57 m

- Average freeboard: 18.07 ft / 5.51 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 155.7 %

- Above water (accommodation/working, high = better): 128.1 %

Waterplane Area: 15,530 Square feet or 1,443 Square metres

Displacement factor (Displacement / loading): 122 %

Structure weight / hull surface area: 85 lbs/sq ft or 414 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.94

- Longitudinal: 1.77

- Overall: 1.00

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is excellent

20t for Radar

80t for Sonar, 2 Depth Charge Projector, 100 Depth Charges

Rachan

Looks generally ok, if it was my carrier I would want a bit more stability.

I'm not too worried about the belt armour not covering all machinery and magazines, carrier layouts are different from classic battleship/cruiser design which SS is hardwired for.

You can easily fit 30 aircraft on this design. It might be worth adding a little more misc weight, but this is a relatively cheap and small design and 2,000 tons might be just enough.

Range feels a little low for a carrier, of course this means bumping up the displacement if you add more fuel. Depends on what operation profiles you are thinking of, as a coastal defence asset 4,000nm might be enough but if your just doing coastal protection do you need a carrier at all?

Taskin

Its refreshing to see a small light cruiser in WW as sizes have tended to balloon over the years. The Taskin seems more like a super destroyer of the types we've been seeing lately.

You definitely want the armour belt to cover the machinery and magazine spaces.

Stability needs improving, 1.04 gives you no margin for battle damage or future growth.

Need more misc weight, 100 tons isnt really enough, I would probably use 200-250 tons at least. Always safer to have a cushion and fit more 'goodies' like command spaces etc.

Range feels a little low for a carrier, of course this means bumping up the displacement if you add more fuel.

- With that length, if you were to use jets on this design, you would probably need the majority of the deck, even with catapults. Same thing for landing. Operations is probably going to be one plane at the time.

- For the 76mm guns, 150 shells per guns is quite low. The crew is going to burn through them in no time.

- I don't think that the torpedo bulkhead has enough space to work properly with a beam that narrow so that should be dropped. This will most likely result in you having enough coverage for the main belt.

Taskin

- All main guns are raised. If it is a conventional layout, only the 2 guns for B turret need to be raised. This will help stability.

- Same thing with the Rachan regarding the torpedo bulkhead. Should be dropped. The main belt is probably long enough once that is dropped.

## Quoted

You can easily fit 30 aircraft on this design. It might be worth adding a little more misc weight, but this is a relatively cheap and small design and 2,000 tons might be just enough.

While it may be 900 tons for prop planes, SS notes indicates that jets are 2/3 the number of normal planes. So for 30 jets, you would need the same amount of miscellaneous as 45 normal planes. That would mean 2025 tons.

As for the air group on my carrier, I'm specifically looking at 12 jets and 18 prop planes. It's not designed as a jet exclusive carrier, but one that can be mostly jet in time, or be all jet with a very slightly reduced air group.

I'll get to work on the location of the guns....I'm used to SS3 in that regard, where you get very specific, so I think I must have missed where that bit goes in SS2.

Displacement:

4,428 t light; 4,617 t standard; 5,038 t normal; 5,376 t full load

Dimensions: Length overall / water x beam x draught

475.00 ft / 475.00 ft x 45.00 ft x 15.00 ft (normal load)

144.78 m / 144.78 m x 13.72 m x 4.57 m

Armament:

6 - 5.91" / 150 mm guns (3x2 guns), 102.98lbs / 46.71kg shells, 1948 Model

Quick firing guns in turrets (on barbettes)

on centreline ends, majority forward, 1 raised mount - superfiring

6 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1948 Model

Dual purpose guns in deck mounts with hoists

on side, evenly spread

16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side ends, evenly spread

Weight of broadside 965 lbs / 438 kg

Shells per gun, main battery: 150

8 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 3.15" / 80 mm 269.03 ft / 82.00 m 6.56 ft / 2.00 m

Ends: Unarmoured

Main Belt covers 87 % of normal length

Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 3.15" / 80 mm 1.57" / 40 mm 3.54" / 90 mm

2nd: 3.15" / 80 mm 1.57" / 40 mm 3.54" / 90 mm

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 2 shafts, 41,396 shp / 30,882 Kw = 30.00 kts

Range 6,000nm at 15.00 kts

Bunker at max displacement = 759 tons

Complement:

298 - 388

Cost:

£2.967 million / $11.867 million

Distribution of weights at normal displacement:

Armament: 121 tons, 2.4 %

Armour: 923 tons, 18.3 %

- Belts: 236 tons, 4.7 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 215 tons, 4.3 %

- Armour Deck: 452 tons, 9.0 %

- Conning Tower: 20 tons, 0.4 %

Machinery: 1,012 tons, 20.1 %

Hull, fittings & equipment: 2,173 tons, 43.1 %

Fuel, ammunition & stores: 610 tons, 12.1 %

Miscellaneous weights: 200 tons, 4.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

7,478 lbs / 3,392 Kg = 72.6 x 5.9 " / 150 mm shells or 1.3 torpedoes

Stability (Unstable if below 1.00): 1.08

Metacentric height 1.7 ft / 0.5 m

Roll period: 14.3 seconds

Steadiness - As gun platform (Average = 50 %): 56 %

- Recoil effect (Restricted arc if above 1.00): 0.69

Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 10.56 : 1

'Natural speed' for length: 24.64 kts

Power going to wave formation at top speed: 59 %

Trim (Max stability = 0, Max steadiness = 100): 46

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.00 ft / 7.62 m

- Forecastle (20 %): 21.00 ft / 6.40 m

- Mid (50 %): 17.00 ft / 5.18 m

- Quarterdeck (15 %): 15.00 ft / 4.57 m

- Stern: 15.00 ft / 4.57 m

- Average freeboard: 18.07 ft / 5.51 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 88.6 %

- Above water (accommodation/working, high = better): 128.1 %

Waterplane Area: 15,530 Square feet or 1,443 Square metres

Displacement factor (Displacement / loading): 123 %

Structure weight / hull surface area: 81 lbs/sq ft or 395 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.93

- Longitudinal: 1.94

- Overall: 1.00

Hull space for machinery, storage, compartmentation is adequate

Room for accommodation and workspaces is excellent

Good seaboat, rides out heavy weather easily

20t for Radar

80t for Sonar, 2 Depth Charge Projector, 100 Depth Charges

Displacement:

8,175 t light; 8,374 t standard; 8,979 t normal; 9,463 t full load

Dimensions: Length overall / water x beam x draught

555.00 ft / 555.00 ft x 58.00 ft x 17.75 ft (normal load)

169.16 m / 169.16 m x 17.68 m x 5.41 m

Armament:

8 - 2.99" / 76.0 mm guns in single mounts, 13.39lbs / 6.07kg shells, 1948 Model

Anti-aircraft guns in deck mounts with hoists

on side, evenly spread

40 - 1.57" / 40.0 mm guns (10x4 guns), 1.95lbs / 0.88kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side, evenly spread

Weight of broadside 185 lbs / 84 kg

Shells per gun, main battery: 150

Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main: 3.15" / 80 mm 295.28 ft / 90.00 m 9.84 ft / 3.00 m

Ends: Unarmoured

Main Belt covers 82 % of normal length

- Armour deck: 3.15" / 80 mm, Conning tower: 3.15" / 80 mm

Machinery:

Oil fired boilers, steam turbines,

Geared drive, 4 shafts, 56,216 shp / 41,937 Kw = 30.00 kts

Range 6,000nm at 15.00 kts

Bunker at max displacement = 1,089 tons

Complement:

460 - 599

Cost:

£3.712 million / $14.847 million

Distribution of weights at normal displacement:

Armament: 23 tons, 0.3 %

Armour: 1,788 tons, 19.9 %

- Belts: 396 tons, 4.4 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 0 tons, 0.0 %

- Armour Deck: 1,363 tons, 15.2 %

- Conning Tower: 29 tons, 0.3 %

Machinery: 1,374 tons, 15.3 %

Hull, fittings & equipment: 2,790 tons, 31.1 %

Fuel, ammunition & stores: 804 tons, 9.0 %

Miscellaneous weights: 2,200 tons, 24.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

13,425 lbs / 6,089 Kg = 1,002.3 x 3.0 " / 76 mm shells or 1.9 torpedoes

Stability (Unstable if below 1.00): 1.09

Metacentric height 2.6 ft / 0.8 m

Roll period: 15.0 seconds

Steadiness - As gun platform (Average = 50 %): 51 %

- Recoil effect (Restricted arc if above 1.00): 0.04

Seaboat quality (Average = 1.00): 1.09

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.550

Length to Beam Ratio: 9.57 : 1

'Natural speed' for length: 26.83 kts

Power going to wave formation at top speed: 56 %

Trim (Max stability = 0, Max steadiness = 100): 47

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 25.00 ft / 7.62 m

- Forecastle (20 %): 20.00 ft / 6.10 m

- Mid (50 %): 16.00 ft / 4.88 m

- Quarterdeck (15 %): 16.00 ft / 4.88 m

- Stern: 16.49 ft / 5.03 m

- Average freeboard: 17.84 ft / 5.44 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 79.0 %

- Above water (accommodation/working, high = better): 163.9 %

Waterplane Area: 23,388 Square feet or 2,173 Square metres

Displacement factor (Displacement / loading): 130 %

Structure weight / hull surface area: 80 lbs/sq ft or 393 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 1.00

- Longitudinal: 1.08

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is excellent

50t Misc Weight, Radars

1800t Misc Weight, Hangar and flight deck accomodations (2 catapults, 2 elevators) for 30 aircraft (Jet or Prop)

150t Misc Weight, Aviation Ordnance

I think I've gotten most of the issues worked out with the cruiser as well.

As for neither design being particularly refined, they are the first ships of this size that are being laid down in over a decade, possibly ever for Thailand (I haven't gone hunting to see if Thailand ever laid down anything of cruiser size).

Chaemp, Thailand Destroyer laid down 1948

Displacement:

1,992 t light; 2,078 t standard; 2,256 t normal; 2,399 t full load

Dimensions: Length overall / water x beam x draught

390.00 ft / 390.00 ft x 30.00 ft x 15.00 ft (normal load)

118.87 m / 118.87 m x 9.14 m x 4.57 m

Armament:

6 - 4.72" / 120 mm guns (3x2 guns), 52.72lbs / 23.92kg shells, 1948 Model

Dual purpose guns in deck mounts with hoists

on centreline ends, majority forward, 1 raised mount - superfiring

16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1948 Model

Breech loading guns in deck mounts

on side, all amidships

10 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1948 Model

Breech loading guns in deck mounts

on side ends, evenly spread

Weight of broadside 350 lbs / 159 kg

Shells per gun, main battery: 200

8 - 21.0" / 533.4 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.26" / 32 mm 0.79" / 20 mm 1.26" / 32 mm

- Armour deck: 0.98" / 25 mm

Machinery:

Oil fired boilers, steam turbines plus diesel motors,

Geared drive, 2 shafts, 33,248 shp / 24,803 Kw = 32.00 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 321 tons

Complement:

163 - 212

Cost:

£1.636 million / $6.543 million

Distribution of weights at normal displacement:

Armament: 44 tons, 1.9 %

Armour: 160 tons, 7.1 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 19 tons, 0.8 %

- Armour Deck: 141 tons, 6.3 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 807 tons, 35.8 %

Hull, fittings & equipment: 831 tons, 36.8 %

Fuel, ammunition & stores: 265 tons, 11.7 %

Miscellaneous weights: 150 tons, 6.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

1,141 lbs / 518 Kg = 21.6 x 4.7 " / 120 mm shells or 0.4 torpedoes

Stability (Unstable if below 1.00): 1.03

Metacentric height 0.9 ft / 0.3 m

Roll period: 13.5 seconds

Steadiness - As gun platform (Average = 50 %): 53 %

- Recoil effect (Restricted arc if above 1.00): 0.81

Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:

Hull has raised forecastle

and transom stern

Block coefficient: 0.450

Length to Beam Ratio: 13.00 : 1

'Natural speed' for length: 22.23 kts

Power going to wave formation at top speed: 61 %

Trim (Max stability = 0, Max steadiness = 100): 50

Bow angle (Positive = bow angles forward): 0.00 degrees

Stern overhang: 0.00 ft / 0.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 18.00 ft / 5.49 m

- Forecastle (20 %): 17.00 ft / 5.18 m (14.00 ft / 4.27 m aft of break)

- Mid (50 %): 12.00 ft / 3.66 m

- Quarterdeck (15 %): 12.00 ft / 3.66 m

- Stern: 12.00 ft / 3.66 m

- Average freeboard: 13.38 ft / 4.08 m

Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 138.5 %

- Above water (accommodation/working, high = better): 59.7 %

Waterplane Area: 7,752 Square feet or 720 Square metres

Displacement factor (Displacement / loading): 99 %

Structure weight / hull surface area: 50 lbs/sq ft or 246 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.78

- Longitudinal: 2.05

- Overall: 0.86

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is cramped

50t for Radar

100t for Sonar, 100 Depth Charges, 4 Depth Charge Throwers

MTB 24B Class

Displacement: 90tons

Dimensions: 40m x 5m x 1.5m

Machinery: 6 x Diesel engines, 1100hp each = 6600hp = 40knts

Range: 600nm @ 35knts

Armament: 4 x torpedoes (600mm/533mm/450mm), 1 x 40mm/60 fore, 1 x 20mm amidships, 1 40mm/60 aft, 10 DCs

Complement: 26

Other notes: C-tubes, 10mm armour plate around conning position

The 40mm and 20mm batteries should be noted as Antiaircraft if that is your intent; for a destroyer in this period, that would be the normal expectation.

The choice of a COSAD powerplant is interesting; they’ve been used on larger vessels but at least to in my memory not on destroyer sized vessels. There does not seem to be any particular detriment in Springsharp to the choice so this is not a particular problem that needs attention.

However I think you should consider giving the stem of the design some sheer (the sim indicates a bow angle of zero degrees) and a bit of a stern overhang. You might also reconsider increasing the freeboard and opt for a midbreak – I find that configuration (depending upon the values selected) can really improve seakeeping. Overall I would consider the stability and seakeeping of the current design marginal.

I would strongly recommend ditching the armored deck – for a destroyer sized vessel in is too much weight carried too high and hurts stability and seakeeping. The general rule of thumb I follow is to get a design to have a minimum stability value of 1.10, and preferably 1.15, and coupled with a seakeeping of at least 1.10 or better. The armor on the gun houses also seems excessive and you could also economize there.

TBD, TBD Destroyer laid down 1948

Displacement:

2,209 t light; 2,300 t standard; 2,485 t normal; 2,632 t full load

Dimensions: Length overall / water x beam x draught

404.55 ft / 393.70 ft x 39.37 ft x 14.76 ft (normal load)

123.31 m / 120.00 m x 12.00 m x 4.50 m

Armament:

6 - 4.72" / 120 mm guns (3x2 guns), 52.72lbs / 23.92kg shells, 1948 Model

Dual purpose guns in deck mounts with hoists

on centreline ends, majority forward, 1 raised mount - superfiring

16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side, all amidships

10 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1948 Model

Anti-aircraft guns in deck mounts

on side ends, evenly spread

Weight of broadside 350 lbs / 159 kg

Shells per gun, main battery: 200

8 - 21.0" / 533 mm above water torpedoes

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 0.59" / 15 mm 0.59" / 15 mm 0.79" / 20 mm

2nd: 0.39" / 10 mm 0.39" / 10 mm -

Machinery:

Oil fired boilers, steam turbines plus diesel motors,

Geared drive, 2 shafts, 33,748 shp / 25,176 Kw = 32.00 kts

Range 4,000nm at 15.00 kts

Bunker at max displacement = 332 tons

Complement:

175 - 228

Cost:

£1.711 million / $6.844 million

Distribution of weights at normal displacement:

Armament: 44 tons, 1.8 %

Armour: 16 tons, 0.6 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 16 tons, 0.6 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.0 %

Machinery: 825 tons, 33.2 %

Hull, fittings & equipment: 1,245 tons, 50.1 %

Fuel, ammunition & stores: 275 tons, 11.1 %

Miscellaneous weights: 80 tons, 3.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

2,353 lbs / 1,067 Kg = 44.6 x 4.7 " / 120 mm shells or 0.6 torpedoes

Stability (Unstable if below 1.00): 1.15

Metacentric height 1.6 ft / 0.5 m

Roll period: 13.0 seconds

Steadiness - As gun platform (Average = 50 %): 63 %

- Recoil effect (Restricted arc if above 1.00): 0.46

Seaboat quality (Average = 1.00): 1.53

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak

and transom stern

Block coefficient: 0.380

Length to Beam Ratio: 10.00 : 1

'Natural speed' for length: 23.03 kts

Power going to wave formation at top speed: 61 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 18.00 degrees

Stern overhang: 3.28 ft / 1.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 23.29 ft / 7.10 m

- Forecastle (20 %): 22.64 ft / 6.90 m (21.98 ft / 6.70 m aft of break)

- Mid (50 %): 21.98 ft / 6.70 m (14.44 ft / 4.40 m aft of break)

- Quarterdeck (15 %): 14.44 ft / 4.40 m

- Stern: 14.44 ft / 4.40 m

- Average freeboard: 18.39 ft / 5.61 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 125.3 %

- Above water (accommodation/working, high = better): 123.3 %

Waterplane Area: 9,805 Square feet or 911 Square metres

Displacement factor (Displacement / loading): 119 %

Structure weight / hull surface area: 61 lbs/sq ft or 297 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.77

- Longitudinal: 4.25

- Overall: 0.92

Hull space for machinery, storage, compartmentation is cramped

Room for accommodation and workspaces is excellent

Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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