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Description
Nabor Soliani, General of the Genio Navale, and naval engineer who amongst other things, designed the Agordat class torpedo cruisers and the Mirabello class destroyers, proposed two cruiser design in 1920 described as light battlecrusiers. The first version which you can see here was equipped with 2 twin 203mm, 6 twin 102mm and probably 12 single 76mm guns as well as 4 twin 533mm Torpedo launchers near the main turrets. Very few info was available about the design other then the armament the displacement would be 10.700tons with a speed of 34knots.
Coloured version to be found here:
tzoli.deviantart.com/art/Nabor…
The other revised version features almost the same armament just the main guns replaced with much larger twin 381mm cannons and because of this the torpedo launchers were more further from the turrets, essentially creating an Italian small Courageous! You can find it here:
tzoli.deviantart.com/art/Nabor…
Only 2 drawing exist of the proposals, this is the current version:
i.imgur.com/0PWmrav.jpg
I've tried a simulation on the design:
RM Carlo Alberto, Regina Marina Heavy Cruiser laid down 1920 (Engine 1921)
Displacement:
9 405 t light; 9 813 t standard; 10 700 t normal; 11 409 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(643,04 ft / 643,04 ft) x 49,21 ft x (19,69 / 20,76 ft)
(196,00 m / 196,00 m) x 15,00 m x (6,00 / 6,33 m)
Armament:
4 - 8,00" / 203 mm 45,0 cal guns - 255,74lbs / 116,00kg shells, 200 per gun
Breech loading guns in turret on barbette mounts, 1900 Model
2 x Twin mounts on centreline ends, evenly spread
12 - 4,00" / 102 mm 45,0 cal guns - 35,27lbs / 16,00kg shells, 250 per gun
Quick firing guns in deck mounts, 1919 Model
6 x Twin mounts on centreline, evenly spread
6 raised mounts
12 - 3,00" / 76,2 mm 40,0 cal guns - 12,94lbs / 5,87kg shells, 250 per gun
Quick firing guns in casemate mounts, 1917 Model
12 x Twin mounts on sides, evenly spread
Weight of broadside 1 601 lbs / 726 kg
Main Torpedoes
8 - 21,0" / 533 mm, 23,25 ft / 7,09 m torpedoes - 1,495 t each, 11,961 t total
In 4 sets of deck mounted side rotating tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,00" / 76 mm 360,89 ft / 110,00 m 8,53 ft / 2,60 m
Ends: 1,00" / 25 mm 282,15 ft / 86,00 m 8,53 ft / 2,60 m
Upper: 1,00" / 25 mm 360,89 ft / 110,00 m 8,20 ft / 2,50 m
Main Belt covers 86 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead - Strengthened structural bulkheads:
2,00" / 51 mm 360,89 ft / 110,00 m 18,04 ft / 5,50 m
Beam between torpedo bulkheads 42,65 ft / 13,00 m
- Hull void:
0,00" / 0 mm 0,00 ft / 0,00 m 0,00 ft / 0,00 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5,91" / 150 mm 5,91" / 150 mm 5,91" / 150 mm
3rd: 2,99" / 76 mm - -
- Armoured deck - multiple decks:
For and Aft decks: 1,50" / 38 mm
Forecastle: 1,50" / 38 mm Quarter deck: 1,50" / 38 mm
- Conning towers: Forward 3,00" / 76 mm, Aft 1,00" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 109 325 shp / 81 557 Kw = 34,00 kts
Range 6 800nm at 14,00 kts
Bunker at max displacement = 1 596 tons
Complement:
525 - 683
Cost:
£2,313 million / $9,254 million
Distribution of weights at normal displacement:
Armament: 335 tons, 3,1 %
- Guns: 311 tons, 2,9 %
- Weapons: 24 tons, 0,2 %
Armour: 2 101 tons, 19,6 %
- Belts: 590 tons, 5,5 %
- Torpedo bulkhead: 482 tons, 4,5 %
- Armament: 340 tons, 3,2 %
- Armour Deck: 648 tons, 6,1 %
- Conning Towers: 42 tons, 0,4 %
Machinery: 3 765 tons, 35,2 %
Hull, fittings & equipment: 3 095 tons, 28,9 %
Fuel, ammunition & stores: 1 295 tons, 12,1 %
Miscellaneous weights: 110 tons, 1,0 %
- Hull below water: 20 tons
- Hull void weights: 30 tons
- Hull above water: 20 tons
- On freeboard deck: 30 tons
- Above deck: 10 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7 555 lbs / 3 427 Kg = 29,5 x 8,0 " / 203 mm shells or 1,0 torpedoes
Stability (Unstable if below 1.00): 1,15
Metacentric height 2,3 ft / 0,7 m
Roll period: 13,8 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0,55
Seaboat quality (Average = 1.00): 1,04
Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0,601 / 0,608
Length to Beam Ratio: 13,07 : 1
'Natural speed' for length: 25,36 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: -3,28 ft / -1,00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 22,00 %, 22,97 ft / 7,00 m, 19,69 ft / 6,00 m
- Forward deck: 28,00 %, 19,69 ft / 6,00 m, 16,40 ft / 5,00 m
- Aft deck: 28,00 %, 16,40 ft / 5,00 m, 18,04 ft / 5,50 m
- Quarter deck: 22,00 %, 18,04 ft / 5,50 m, 19,69 ft / 6,00 m
- Average freeboard: 18,65 ft / 5,68 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 145,4 %
- Above water (accommodation/working, high = better): 145,2 %
Waterplane Area: 23 171 Square feet or 2 153 Square metres
Displacement factor (Displacement / loading): 98 %
Structure weight / hull surface area: 92 lbs/sq ft or 450 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,99
- Longitudinal: 1,06
- Overall: 1,00
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Coloured version to be found here:
tzoli.deviantart.com/art/Nabor…
The other revised version features almost the same armament just the main guns replaced with much larger twin 381mm cannons and because of this the torpedo launchers were more further from the turrets, essentially creating an Italian small Courageous! You can find it here:
tzoli.deviantart.com/art/Nabor…
Only 2 drawing exist of the proposals, this is the current version:
i.imgur.com/0PWmrav.jpg
I've tried a simulation on the design:
RM Carlo Alberto, Regina Marina Heavy Cruiser laid down 1920 (Engine 1921)
Displacement:
9 405 t light; 9 813 t standard; 10 700 t normal; 11 409 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(643,04 ft / 643,04 ft) x 49,21 ft x (19,69 / 20,76 ft)
(196,00 m / 196,00 m) x 15,00 m x (6,00 / 6,33 m)
Armament:
4 - 8,00" / 203 mm 45,0 cal guns - 255,74lbs / 116,00kg shells, 200 per gun
Breech loading guns in turret on barbette mounts, 1900 Model
2 x Twin mounts on centreline ends, evenly spread
12 - 4,00" / 102 mm 45,0 cal guns - 35,27lbs / 16,00kg shells, 250 per gun
Quick firing guns in deck mounts, 1919 Model
6 x Twin mounts on centreline, evenly spread
6 raised mounts
12 - 3,00" / 76,2 mm 40,0 cal guns - 12,94lbs / 5,87kg shells, 250 per gun
Quick firing guns in casemate mounts, 1917 Model
12 x Twin mounts on sides, evenly spread
Weight of broadside 1 601 lbs / 726 kg
Main Torpedoes
8 - 21,0" / 533 mm, 23,25 ft / 7,09 m torpedoes - 1,495 t each, 11,961 t total
In 4 sets of deck mounted side rotating tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,00" / 76 mm 360,89 ft / 110,00 m 8,53 ft / 2,60 m
Ends: 1,00" / 25 mm 282,15 ft / 86,00 m 8,53 ft / 2,60 m
Upper: 1,00" / 25 mm 360,89 ft / 110,00 m 8,20 ft / 2,50 m
Main Belt covers 86 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead - Strengthened structural bulkheads:
2,00" / 51 mm 360,89 ft / 110,00 m 18,04 ft / 5,50 m
Beam between torpedo bulkheads 42,65 ft / 13,00 m
- Hull void:
0,00" / 0 mm 0,00 ft / 0,00 m 0,00 ft / 0,00 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5,91" / 150 mm 5,91" / 150 mm 5,91" / 150 mm
3rd: 2,99" / 76 mm - -
- Armoured deck - multiple decks:
For and Aft decks: 1,50" / 38 mm
Forecastle: 1,50" / 38 mm Quarter deck: 1,50" / 38 mm
- Conning towers: Forward 3,00" / 76 mm, Aft 1,00" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 109 325 shp / 81 557 Kw = 34,00 kts
Range 6 800nm at 14,00 kts
Bunker at max displacement = 1 596 tons
Complement:
525 - 683
Cost:
£2,313 million / $9,254 million
Distribution of weights at normal displacement:
Armament: 335 tons, 3,1 %
- Guns: 311 tons, 2,9 %
- Weapons: 24 tons, 0,2 %
Armour: 2 101 tons, 19,6 %
- Belts: 590 tons, 5,5 %
- Torpedo bulkhead: 482 tons, 4,5 %
- Armament: 340 tons, 3,2 %
- Armour Deck: 648 tons, 6,1 %
- Conning Towers: 42 tons, 0,4 %
Machinery: 3 765 tons, 35,2 %
Hull, fittings & equipment: 3 095 tons, 28,9 %
Fuel, ammunition & stores: 1 295 tons, 12,1 %
Miscellaneous weights: 110 tons, 1,0 %
- Hull below water: 20 tons
- Hull void weights: 30 tons
- Hull above water: 20 tons
- On freeboard deck: 30 tons
- Above deck: 10 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7 555 lbs / 3 427 Kg = 29,5 x 8,0 " / 203 mm shells or 1,0 torpedoes
Stability (Unstable if below 1.00): 1,15
Metacentric height 2,3 ft / 0,7 m
Roll period: 13,8 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0,55
Seaboat quality (Average = 1.00): 1,04
Hull form characteristics:
Hull has a flush deck,
a normal bow and a round stern
Block coefficient (normal/deep): 0,601 / 0,608
Length to Beam Ratio: 13,07 : 1
'Natural speed' for length: 25,36 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: -3,28 ft / -1,00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 22,00 %, 22,97 ft / 7,00 m, 19,69 ft / 6,00 m
- Forward deck: 28,00 %, 19,69 ft / 6,00 m, 16,40 ft / 5,00 m
- Aft deck: 28,00 %, 16,40 ft / 5,00 m, 18,04 ft / 5,50 m
- Quarter deck: 22,00 %, 18,04 ft / 5,50 m, 19,69 ft / 6,00 m
- Average freeboard: 18,65 ft / 5,68 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 145,4 %
- Above water (accommodation/working, high = better): 145,2 %
Waterplane Area: 23 171 Square feet or 2 153 Square metres
Displacement factor (Displacement / loading): 98 %
Structure weight / hull surface area: 92 lbs/sq ft or 450 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,99
- Longitudinal: 1,06
- Overall: 1,00
Cramped machinery, storage, compartmentation space
Excellent accommodation and workspace room
Image size
3121x1305px 323.5 KB
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Comments53
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Ah, the early days heavy cruisers... I always liked the Hawkins, Furutakas and Pensacolas, regardless of them being crappy ships... also, this thing looks a lot like a Kuma class light cruiser... it's nice to hint at cooperation between the Axis navies...