[size=3]
RHN C-4 Helle Class, Greek Heavy Cruiser laid down 1909[/size]
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C-4 Helle Laid Down 01/Jul/09 Entered Service 19/Sep/11 (reconstructed) 01/Jan/27 to 09/Oct/28 (reconstructed) 02/Jan/44 to ?
C-5 Kriti Laid Down 08/May/10 Entered Service 26/Jul/12 (reconstructed) 01/Jan/28 to 09/Oct/29 (reconstructed) 02/Jan/44 to ?
Helle as completed 1912
Kriti in 1925 prior to her rebuild.
Large cruisers built with American assistance in Greek shipyards. These ships were to counter the growth of the Turkish navy. Turkey countered with a Dreadnought built in Italy.
Displacement:
12,291 t light; 12,884 t standard; 15,377 t normal; 17,310 t full load
Loading submergence 743 tons/feet
Dimensions:
600.00 ft x 69.00 ft x 26.00 ft (normal load)
182.88 m x 21.03 m x 7.92 m
Armament:
10 - 8.00" / 203 mm guns (5 Main turrets x 2 guns, 2 superfiring turrets)
12 - 5.00" / 127 mm guns
Secondary guns mounted low & subject to being washed down in a seaway
8 - 3.00" / 76 mm QF guns
Weight of broadside 3,418 lbs / 1,550 kg
4 - 21.0" / 533.4 mm submerged torpedo tubes
Armour:
Belt 8.00" / 203 mm, end belts 2.00" / 51 mm
Belts cover 88 % of normal area
Main turrets 8.00" / 203 mm, 2nd casemates 2.00" / 51 mm
Armour deck 2.20" / 56 mm, Conning tower 10.00" / 254 mm
Machinery: Coal fired boilers, steam turbines,
Direct drive, 4 shafts, 58,349 shp / 43,529 Kw = 27.20 kts
Range 6,000nm at 15.00 kts
Complement:
690 - 897
Cost:
£1.198 million / $4.790 million
Distribution of weights at normal Displacement:
Armament: 427 tons, 2.8 % Armour: 3,678 tons, 23.9 %
Belts: 1,274 tons, 8.3 %, Armament: 1,211 tons, 7.9 %, Armour Deck: 1,059 tons, 6.9 %
Conning Tower: 133 tons, 0.9 %, Torpedo bulkhead: 0 tons, 0.0 % Machinery: 2,917 tons, 19.0 %
Hull, fittings & equipment: 5,269 tons, 34.3 %
Fuel, ammunition & stores: 3,086 tons, 20.1 %
Miscellaneous weights: 0 tons, 0.0 %
Metacentric height 3.2
Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.05
Shellfire needed to sink: 16,928 lbs / 7,678 Kg = 66.1 x 8.0 " / 203 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.0
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.53
Relative quality as seaboat: 1.20
Hull form characteristics:
Block coefficient: 0.500
Sharpness coefficient: 0.35
Hull speed coefficient 'M': 7.38
'Natural speed' for length: 24.49 kts
Power going to wave formation at top speed: 50 %
Trim: 59
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 87.1 %
Relative accommodation and working space: 129.3 %
(Average = 100%)
Displacement factor: 119 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.98
(Structure weight / hull surface area: 124 lbs / square foot or 608 Kg / square metre)
Relative longitudinal hull strength: 1.25
(for 18.00 ft / 5.49 m average freeboard, freeboard adjustment 1.50 ft)
Relative composite hull strength: 1.00
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[size=3]
RHN C-4 Helle Class, Greek Heavy Cruiser - as rebuilt laid down 1927[/size]
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Helle as rebuilt 1929.
Displacement:
12,813 t light; 13,375 t standard; 14,194 t normal; 14,793 t full load
Loading submergence 743 tons/feet
Dimensions:
600.00 ft x 69.00 ft x 24.00 ft (normal load)
182.88 m x 21.03 m x 7.32 m
Armament:
10 - 8.00" / 203 mm guns (5 Main turrets x 2 guns, 2 superfiring turrets)
8 - 5.00" / 127 mm guns
8 - 4.00" / 102 mm AA guns
12 - 1.50" / 38 mm guns
Weight of broadside 3,336 lbs / 1,513 kg
8 - 21.0" / 533.4 mm above water torpedoes
Armour:
Belt 8.00" / 203 mm, end belts 2.00" / 51 mm
Belts cover 88 % of normal area
Main turrets 8.00" / 203 mm, 2nd gun shields 2.00" / 51 mm
Armour deck 2.20" / 56 mm, Conning tower 10.00" / 254 mm
Machinery: Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 87,540 shp / 65,305 Kw = 30.50 kts
Range 5,000nm at 15.00 kts
Complement:
650 - 845
Cost:
£4.311 million / $17.245 million
Distribution of weights at normal Displacement:
Armament: 417 tons, 2.9 % Armour: 3,825 tons, 26.9 %
Belts: 1,274 tons, 9.0 %, Armament: 1,365 tons, 9.6 %, Armour Deck: 1,059 tons, 7.5 %
Conning Tower: 126 tons, 0.9 %, Torpedo bulkhead: 0 tons, 0.0 % Machinery: 2,763 tons, 19.5 %
Hull, fittings & equipment: 5,808 tons, 40.9 %
Fuel, ammunition & stores: 1,381 tons, 9.7 %
Miscellaneous weights: 0 tons, 0.0 %
Metacentric height 3.2
Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Good seaboat, rides out heavy weather easily
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.06
Shellfire needed to sink: 18,995 lbs / 8,616 Kg = 74.2 x 8.0 " / 203 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 51 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.61
Relative quality as seaboat: 1.24
Hull form characteristics:
Block coefficient: 0.500
Sharpness coefficient: 0.35
Hull speed coefficient 'M': 7.58
'Natural speed' for length: 24.49 kts
Power going to wave formation at top speed: 56 %
Trim: 41
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 86.3 %
Relative accommodation and working space: 158.6 %
(Average = 100%)
Displacement factor: 112 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.94
(Structure weight / hull surface area: 130 lbs / square foot or 635 Kg / square metre)
Relative longitudinal hull strength: 1.72
(for 24.00 ft / 7.32 m average freeboard, freeboard adjustment 7.76 ft)
Relative composite hull strength: 1.00
[SIZE=3]
Helle Class, Greek Heavy Cruiser after 1944 reconstruction[/SIZE]
Displacement:
12,663 t light; 13,453 t standard; 14,182 t normal; 14,765 t full load
Dimensions: Length overall / water x beam x draught
610.67 ft / 600.00 ft x 69.00 ft x 24.00 ft (normal load)
186.13 m / 182.88 m x 21.03 m x 7.32 m
Armament:
10 - 8.00" / 203 mm guns (5x2 guns), 300.00lbs / 136.08kg shells, 1941 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority aft, 2 raised mounts - superfiring
8 - 5.00" / 127 mm guns (4x2 guns), 59.90lbs / 27.17kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 2 raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 2.00lbs / 0.91kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 1.57" / 40.0 mm guns (6x2 guns), 2.00lbs / 0.91kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on centreline, all aft, all raised mounts - superfiring
6 - 0.98" / 25.0 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1939 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 3,522 lbs / 1,598 kg
Shells per gun, main battery: 250
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 345.00 ft / 105.16 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 88 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 4.00" / 102 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
- Armour deck: 2.20" / 56 mm, Conning tower: 10.00" / 254 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 87,400 shp / 65,201 Kw = 30.50 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 1,312 tons
Complement:
649 - 844
Cost:
£1.081 million / $4.325 million
Distribution of weights at normal displacement:
Armament: 388 tons, 2.7 %
Armour: 4,183 tons, 29.5 %
- Belts: 1,902 tons, 13.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1,032 tons, 7.3 %
- Armour Deck: 1,122 tons, 7.9 %
- Conning Tower: 126 tons, 0.9 %
Machinery: 2,232 tons, 15.7 %
Hull, fittings & equipment: 5,713 tons, 40.3 %
Fuel, ammunition & stores: 1,519 tons, 10.7 %
Miscellaneous weights: 148 tons, 1.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
22,033 lbs / 9,994 Kg = 86.1 x 8.0 " / 203 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 3.3 ft / 1.0 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality (Average = 1.00): 1.15
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.500
Length to Beam Ratio: 8.70 : 1
'Natural speed' for length: 24.49 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 20.86 degrees
Stern overhang: -4.67 ft / -1.42 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.00 ft / 8.53 m
- Forecastle (19 %): 24.00 ft / 7.32 m
- Mid (75 %): 24.00 ft / 7.32 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (18 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 21.78 ft / 6.64 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 75.9 %
- Above water (accommodation/working, high = better): 184.9 %
Waterplane Area: 27,573 Square feet or 2,562 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 129 lbs/sq ft or 632 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.68
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Breakdown of Misc Weight
Surface/Air Search teledetector: 5 tons
Air Search Teledetector: 5 tons
Fire-Control Teledetector: 5 tons
Gunnery Computer: 10 tons
Emergency Electrical Generator Set: 5 tons
2xLeO-400 Floatplanes: 50 tons
1000g AvGas for Floatplanes: 3 tons
Reinforced Quarterdeck for Aircfaft Handling Facilities: 30 tons
Aircraft Crane: 25 tons
Quarters for Aircrew: 8 tons
Ammo for Floatplanes: 2 tons
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