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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 ?
![](http://img.photobucket.com/albums/v402/alt_naval/c4-09.jpg)
Helle as completed 1912
![](http://img.photobucket.com/albums/v402/alt_naval/RHNC-4-Helleclassheavycruiser-photo-v2.jpg)
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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![](http://img.photobucket.com/albums/v402/alt_naval/c4-27.jpg)
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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