Posts: 1587 Joined: November 22nd, 2011, 4:47 am
Location: Marietta, Georgia - USA
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And another Heavy C, this one the Rhiannon Class. Six ships, commissioned in 1940-41. Designed and build by the same folks who built the Colonies class light cruisers, they share many characteristics and design influences with them.
Springsharp'd info for the Rhiannon's
Displacement:
14,293 t light; 14,977 t standard; 16,213 t normal; 17,203 t full load
Dimensions: Length overall / water x beam x draught
678.50 ft / 658.50 ft x 68.00 ft x 23.00 ft (normal load)
206.81 m / 200.71 m x 20.73 m x 7.01 m
Armament:
12 - 8.00" / 203 mm guns (4x3 guns), 256.00lbs / 116.12kg shells, 1940 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
2 - 4.70" / 119 mm guns (1x2 guns), 51.91lbs / 23.55kg shells, 1940 Model
Breech loading guns in a turret (on a barbette)
on centreline aft, all raised guns - superfiring
16 - 4.70" / 119 mm guns (8x2 guns), 51.91lbs / 23.55kg shells, 1940 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread
34 - 1.57" / 40.0 mm guns (17 mounts), 1.95lbs / 0.88kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 8 raised guns
Weight of broadside 4,077 lbs / 1,849 kg
Shells per gun, main battery: 150
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 386.88 ft / 117.92 m 9.90 ft / 3.02 m
Ends: 4.00" / 102 mm 237.10 ft / 72.27 m 9.90 ft / 3.02 m
34.52 ft / 10.52 m Unarmoured ends
Upper: 4.00" / 102 mm 386.88 ft / 117.92 m 8.00 ft / 2.44 m
Main Belt covers 90 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
4.00" / 102 mm 386.88 ft / 117.92 m 21.11 ft / 6.43 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 6.00" / 152 mm 8.00" / 203 mm
2nd: 4.00" / 102 mm 2.00" / 51 mm 4.00" / 102 mm
3rd: 2.00" / 51 mm - -
- Armour deck: 5.00" / 127 mm, Conning tower: 8.00" / 203 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 86,510 shp / 64,537 Kw = 31.00 kts
Range 8,100nm at 15.00 kts
Bunker at max displacement = 2,225 tons
Complement:
717 - 933
Cost:
£7.513 million / $30.051 million
Distribution of weights at normal displacement:
Armament: 510 tons, 3.1 %
Armour: 7,892 tons, 48.7 %
- Belts: 2,176 tons, 13.4 %
- Torpedo bulkhead: 1,209 tons, 7.5 %
- Armament: 1,384 tons, 8.5 %
- Armour Deck: 3,012 tons, 18.6 %
- Conning Tower: 110 tons, 0.7 %
Machinery: 2,313 tons, 14.3 %
Hull, fittings & equipment: 3,578 tons, 22.1 %
Fuel, ammunition & stores: 1,921 tons, 11.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,568 lbs / 6,154 Kg = 53.0 x 8.0 " / 203 mm shells or 3.2 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 2.9 ft / 0.9 m
Roll period: 16.9 seconds
Steadiness - As gun platform (Average = 50 %): 73 %
- Recoil effect (Restricted arc if above 1.00): 0.95
Seaboat quality (Average = 1.00): 1.31
Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.551
Length to Beam Ratio: 9.68 : 1
'Natural speed' for length: 29.19 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 17.20 degrees
Stern overhang: 7.00 ft / 2.13 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 42.00 ft / 12.80 m
- Forecastle (18 %): 33.00 ft / 10.06 m (32.00 ft / 9.75 m aft of break)
- Mid (40 %): 20.00 ft / 6.10 m
- Quarterdeck (20 %): 20.00 ft / 6.10 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 24.41 ft / 7.44 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.2 %
- Above water (accommodation/working, high = better): 191.4 %
Waterplane Area: 32,565 Square feet or 3,025 Square metres
Displacement factor (Displacement / loading): 98 %
Structure weight / hull surface area: 68 lbs/sq ft or 333 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 0.77
- Overall: 0.52
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
I'm really tempted to declare this to be THE FINAL NO MORE CHANGES AT ALL DESIGN OF THIS SHIP because when I do that is when I seem to get the most, and best, suggestions and comments. *shrug* Go figure, huh?
_________________ "Anybody remotely interesting is mad in some way." - The Seventh Doctor
Last edited by Zephyr on April 30th, 2012, 8:40 am, edited 6 times in total.
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