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41

Thursday, November 12th 2009, 11:35pm



I had another bit of a play around with the drawing trying to get a superstructure that I liked more. I'm fairly happy with it, but I'm not sure about the masts.

Cacciatorpidiniere Pesante laid down 1938

Displacement:
4,234 t light; 4,496 t standard; 5,210 t normal; 5,782 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(511.51 ft / 492.13 ft) x 49.21 ft x (16.73 / 17.98 ft)
(155.91 m / 150.00 m) x 15.00 m x (5.10 / 5.48 m)

Armament:
6 - 5.98" / 152 mm 53.0 cal guns - 99.21lbs / 45.00kg shells, 300 per gun
Dual purpose guns in turret on barbette mounts, 1938 Model
3 x 2-gun mounts on centreline ends, majority forward
1 raised mount - superfiring
20 - 1.46" / 37.0 mm 54.0 cal guns - 1.66lbs / 0.75kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1938 Model
5 x Quad mounts on sides, evenly spread
3 raised mounts
18 - 0.98" / 25.0 mm 77.0 cal guns - 0.54lbs / 0.24kg shells, 4,000 per gun
Anti-air guns in deck mounts, 1938 Model
18 x Single mounts on sides, evenly spread
Weight of broadside 638 lbs / 289 kg
8 - 23.6" / 600 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
In 4 sets of deck mounted side rotating tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.42" / 36 mm 344.49 ft / 105.00 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 108 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.76" / 70 mm 1.97" / 50 mm 1.97" / 50 mm
2nd: 0.79" / 20 mm 0.79" / 20 mm -
3rd: 0.39" / 10 mm - -

- Armoured deck - multiple decks: 0.79" / 20 mm For and Aft decks

- Conning towers: Forward 2.76" / 70 mm, Aft 0.00" / 0 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 58,000 shp / 43,268 Kw = 33.04 kts
Range 3,000nm at 24.00 kts
Bunker at max displacement = 1,286 tons

Complement:
306 - 398

Cost:
£2.544 million / $10.178 million

Distribution of weights at normal displacement:
Armament: 260 tons, 5.0 %
Armour: 556 tons, 10.7 %
- Belts: 195 tons, 3.7 %
- Armament: 151 tons, 2.9 %
- Armour Deck: 192 tons, 3.7 %
- Conning Tower: 18 tons, 0.3 %
Machinery: 1,588 tons, 30.5 %
Hull, fittings & equipment: 1,652 tons, 31.7 %
Fuel, ammunition & stores: 977 tons, 18.7 %
Miscellaneous weights: 178 tons, 3.4 %
- Hull below water: 10 tons
- Hull above water: 20 tons
- On freeboard deck: 60 tons
- Above deck: 88 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,265 lbs / 1,935 Kg = 39.8 x 6.0 " / 152 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 2.3 ft / 0.7 m
Roll period: 13.5 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.33
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.450 / 0.465
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 25.47 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 30.00 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 %, 27.89 ft / 8.50 m, 18.04 ft / 5.50 m
- Forward deck: 20.00 %, 18.04 ft / 5.50 m, 18.04 ft / 5.50 m
- Aft deck: 45.00 %, 18.04 ft / 5.50 m, 18.04 ft / 5.50 m
- Quarter deck: 15.00 %, 18.04 ft / 5.50 m, 18.04 ft / 5.50 m
- Average freeboard: 18.83 ft / 5.74 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 115.8 %
- Above water (accommodation/working, high = better): 180.1 %
Waterplane Area: 16,047 Square feet or 1,491 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 65 lbs/sq ft or 319 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.72
- Longitudinal: 1.59
- Overall: 0.78
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

10t = Scaricabombe
14t = 8 x DC Throwers + 50 W100 charges
10t = D3 sonar
10t = Diesel Emergency Generator
20t = RaA.1 Air Warning Radar
10t = RaS.3 Surface Search Radar
5t = Radio Beacon
20t = 2 x GDR.101
55t = 5 x Quadruple 37/54 mountings (18t ea - 1.75t per gun)
24t = 8 x 650/600 x 8.5 torpedoes

42

Thursday, November 12th 2009, 11:35pm



Decided to chuck together a later version with various radars and 76mm secondary battery.