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Saturday, May 31st 2014, 1:51am

Philippine Design Proposals - 1946

A proposed design for a heavy cruiser; intended more for independent operations than screening.


Leyte, Philippine Heavy Cruiser laid down 1946

Displacement: 13,731 t light; 14,449 t standard; 17,050 t normal; 19,131 t full load

Dimensions: Length overall / water x beam x draught

682.70 ft / 670.93 ft x 72.18 ft x 22.47 ft (normal load) [208.09 m / 204.50 m x 22.00 m x 6.85 m]

Armament:

9 - 8.27" / 210 mm guns (3x3 guns), 282.57lbs / 128.17kg shells, 1946 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 2 raised mounts - superfiring
2 - 5.12" / 130 mm guns (1x2 guns), 67.03lbs / 30.40kg shells, 1945 Model Dual purpose guns in a deck mount with hoist on centreline aft
12 - 5.12" / 130 mm guns (6x2 guns), 67.03lbs / 30.40kg shells, 1945 Model Dual purpose guns in deck mounts with hoists on side, all amidships
48 - 1.38" / 35.0 mm guns (12x4 guns), 1.31lbs / 0.59kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, evenly spread, 6 raised mounts
Weight of broadside 3,544 lbs / 1,608 kg
Shells per gun, main battery: 180
8 - 24.0" / 610 mm above water torpedoes

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 426.51 ft / 130.00 m 13.12 ft / 4.00 m
Ends: 1.18" / 30 mm 244.42 ft / 74.50 m 13.12 ft / 4.00 m
Main Belt covers 98 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 7.87" / 200 mm 3.15" / 80 mm 5.91" / 150 mm
2nd: 0.98" / 25 mm 0.98" / 25 mm 0.98" / 25 mm
3rd: 0.98" / 25 mm 0.98" / 25 mm 0.98" / 25 mm
4th: 0.59" / 15 mm 0.39" / 10 mm -

Armour deck: 2.36" / 60 mm, Conning tower: 5.91" / 150 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 4 shafts, 100,519 shp / 74,987 Kw = 32.00 kts
Range 12,000nm at 18.00 kts
Bunker at max displacement = 4,682 tons

Complement: 745 - 969

Cost: £8.539 million / $34.155 million

Distribution of weights at normal displacement:

Armament: 443 tons, 2.6 %
Armour: 3,903 tons, 22.9 %
- Belts: 1,533 tons, 9.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 751 tons, 4.4 %
- Armour Deck: 1,535 tons, 9.0 %
- Conning Tower: 84 tons, 0.5 %
Machinery: 2,510 tons, 14.7 %
Hull, fittings & equipment: 6,674 tons, 39.1 %
Fuel, ammunition & stores: 3,319 tons, 19.5 %
Miscellaneous weights: 200 tons, 1.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 28,392 lbs / 12,878 Kg = 100.5 x 8.3 " / 210 mm shells or 3.0 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.7 ft / 1.1 m
Roll period: 15.8 seconds
Steadiness - As gun platform (Average = 50 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.57
Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.548
Length to Beam Ratio: 9.30: 1
'Natural speed' for length: 29.57 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.17 ft / 9.50 m
- Forecastle (20 %): 25.43 ft / 7.75 m
- Mid (50 %): 19.69 ft / 6.00 m
- Quarterdeck (15 %): 19.69 ft / 6.00 m
- Stern: 20.51 ft / 6.25 m
- Average freeboard: 22.22 ft / 6.77 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 70.4 %
- Above water (accommodation/working, high = better): 160.6 %
Waterplane Area: 35,129 Square feet or 3,264 Square metres
Displacement factor (Displacement / loading): 135 %
Structure weight / hull surface area: 128 lbs/sq ft or 623 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.28
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

2

Sunday, June 1st 2014, 9:03pm

Tirador class Patrol Submarine

Proposed as a successor to the French-designed Cazador class.

Tirador class Patrol Submarine

Date: 1946
Coastal
Armament: 1x75mm, 2x35mm
Elec HP: 1,600 hp
Diesel HP: 4,000 hp
Crew: 42
Weight fuel and batteries: 300 tons
Light Displacement 849 tons
Loaded Displacement 1,039 tons
Full Displacement 1,219 tons
Reserve buoyancy: 15%
Max Surface Speed: 18.2 knots
Max Submerged Speed: 12.5knots

Length: 75.0 meters
Beam: 6.5 meters
Draft: 5.0 meters
Crush depth: 270 meters
Armament: 1x75mm, 2x35mm
#TT: 8 x 24" (6 bow, 2 stern)
40 tons for reload torpedoes or mines
Tons Oil: 150
Tons Battery: 150
Miscellaneous Weight: 40 tons

Surface Range: 11,308 nm at 10 knots
Submerged Range: 74nm@ 8 knots / 39 nm@ 10 knots

Breakdown of Miscellaneous Weights:

3 tons for one twin 35mm AA guns on deck
9 tons for radar and other electronics
6 tons for snort
22 tons for all other equipment

3

Monday, June 2nd 2014, 2:27pm

Nice designs, the Leyte looks pretty powerful and seems well-enough armoured. Good speed and range, so it should do well on independent operations.
The Triador looks ok to me (though I admit I'm no SubSim expert yet!).