WesWorld

OOC: Any comments to improve design are welcomed

Pardela, Philippines Destroyer laid down 1938

Displacement:
1,580 t light; 1,659 t standard; 1,869 t normal; 2,038 t full load

Dimensions: Length overall / water x beam x draught
378.98 ft / 364.99 ft x 31.99 ft x 14.01 ft (normal load)
115.51 m / 111.25 m x 9.75 m x 4.27 m

Armament:
6 - 4.53" / 115 mm guns (3x2 guns), 46.40lbs / 21.05kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.38" / 35.0 mm guns (2x4 guns), 1.31lbs / 0.59kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
18 - 0.54" / 13.7 mm guns (6x3 guns), 0.08lbs / 0.04kg shells, 1938 Model
Machine guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 290 lbs / 132 kg
Shells per gun, main battery: 250
10 - 24.0" / 610 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 37,839 shp / 28,228 Kw = 34.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 379 tons

Complement:
141 - 184

Cost:
£1.172 million / $4.686 million

Distribution of weights at normal displacement:
Armament: 36 tons, 1.9 %
Armour: 24 tons, 1.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 24 tons, 1.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 872 tons, 46.7 %
Hull, fittings & equipment: 572 tons, 30.6 %
Fuel, ammunition & stores: 290 tons, 15.5 %
Miscellaneous weights: 75 tons, 4.0 %

35 tons: rails and weight allotment for mines
25 tons: radar
10 tons: sonar
5 tons: for growth

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
508 lbs / 230 Kg = 10.9 x 4.5 " / 115 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.63
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 11.41 : 1
'Natural speed' for length: 21.86 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 25.00 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 %): 14.01 ft / 4.27 m
- Mid (50 %): 14.01 ft / 4.27 m
- Quarterdeck (15 %): 14.01 ft / 4.27 m
- Stern: 14.01 ft / 4.27 m
- Average freeboard: 14.73 ft / 4.49 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 170.9 %
- Above water (accommodation/working, high = better): 32.2 %
Waterplane Area: 7,459 Square feet or 693 Square metres
Displacement factor (Displacement / loading): 76 %
Structure weight / hull surface area: 36 lbs/sq ft or 175 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.04
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor

My initial reaction is that the design is over-gunned and certainly carrying a dangerously top-heavy load of torpedo tubes. Stability, seaworthiness and composite strength are approaching their respective limits, and the ship is very cramped.

If intended to operate in typhoon-prone waters, I suspect she would suffer considerable damage. The Project 39 ships I designed to operate in the Adriatic or eastern Med are, on paper at least, better seaboats.

I would suggest a reduction in the number and/or size of the torpedo tubes to see what the positive impact might be.

Reducing the number of torps, in SS2, probably won't have much effect except maybe on the extremely cramped rating. L:B is very high.

Reduce L:B and number of torpedos.

Pardela, Philippines Destroyer laid down 1938

Displacement:
1,581 t light; 1,660 t standard; 1,870 t normal; 2,038 t full load

Dimensions: Length overall / water x beam x draught
381.44 ft / 367.45 ft x 33.46 ft x 14.01 ft (normal load)
116.26 m / 112.00 m x 10.20 m x 4.27 m

Armament:
6 - 4.53" / 115 mm guns (3x2 guns), 46.40lbs / 21.05kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 1.38" / 35.0 mm guns (2x4 guns), 1.31lbs / 0.59kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
18 - 0.54" / 13.7 mm guns (6x3 guns), 0.08lbs / 0.04kg shells, 1938 Model
Machine guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 290 lbs / 132 kg
Shells per gun, main battery: 250
8 - 24.0" / 610 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 37,221 shp / 27,767 Kw = 34.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 378 tons

Complement:
141 - 184

Cost:
£1.167 million / $4.667 million

Distribution of weights at normal displacement:
Armament: 36 tons, 1.9 %
Armour: 24 tons, 1.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 24 tons, 1.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 866 tons, 46.3 %
Hull, fittings & equipment: 580 tons, 31.0 %
Fuel, ammunition & stores: 289 tons, 15.5 %
Miscellaneous weights: 75 tons, 4.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
552 lbs / 250 Kg = 11.9 x 4.5 " / 115 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.50
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.380
Length to Beam Ratio: 10.98 : 1
'Natural speed' for length: 22.07 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 25.00 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 %): 14.01 ft / 4.27 m
- Mid (50 %): 14.01 ft / 4.27 m
- Quarterdeck (15 %): 14.01 ft / 4.27 m
- Stern: 14.01 ft / 4.27 m
- Average freeboard: 14.73 ft / 4.49 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 169.7 %
- Above water (accommodation/working, high = better): 60.9 %
Waterplane Area: 7,779 Square feet or 723 Square metres
Displacement factor (Displacement / loading): 77 %
Structure weight / hull surface area: 37 lbs/sq ft or 179 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 1.93
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

40 tons: rails and weight allotment for mines
25 tons: radar
10: sonar

WOOOOOOHHH!!!

BC is .380, that's incredibley skinny. I would recommend at least .400. The L-B ratio is pretty long as well, but it is within the rules, so it's fine.

I have to agree, .405 is the lowest I've ever gone. That said I've noticed a few SAE designs that are in this range and lower.

I've limited myself to .400.