RRC "Super Battleship" Design Study

Logi · December 23, 2008, 03:15:41 PM

(prompted by the CSA UBB)

The RRC ship designers have gotten a little to far ahead of themselves (Oh no we're not seeing another H44 class are we?)

The ambious designers have created this design for a SBB - super battleship - that includes technology not yet obtained such as quadruple turrets and the like.

QuoteBB00 Project - Proto, RRC Battleship Project laid down 1918 (Engine 1916)

Displacement:
   47,426 t light; 50,428 t standard; 53,024 t normal; 55,102 t full load

Dimensions: Length overall / water x beam x draught
   721.00 ft / 721.00 ft x 120.00 ft x 33.00 ft (normal load)
   219.76 m / 219.76 m x 36.58 m x 10.06 m

Armament:
16 - 15.00" / 381 mm guns (4 mounts), 2,000.00lbs / 907.18kg shells, 1918 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread, 2 raised guns - superfiring
16 - 6.00" / 152 mm guns (8x2 guns), 108.00lbs / 48.99kg shells, 1918 Model
     Breech loading guns in deck mounts with hoists
     on side, all amidships
16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1918 Model
     Quick firing guns in casemate mounts
     on side, evenly spread
16 - 3.00" / 76.2 mm guns (8x2 guns), 13.50lbs / 6.12kg shells, 1918 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread
16 - 0.50" / 12.7 mm guns (8x2 guns), 0.06lbs / 0.03kg shells, 1918 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 34,457 lbs / 15,629 kg
   Shells per gun, main battery: 100

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.0" / 381 mm   721.00 ft / 219.76 m   18.00 ft / 5.49 m
   Ends:   Unarmoured
     Main Belt covers 154 % of normal length

- Torpedo Bulkhead:
      2.00" / 51 mm   500.00 ft / 152.40 m   33.00 ft / 10.06 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.0" / 406 mm   9.00" / 229 mm      12.0" / 305 mm
   2nd:   3.00" / 76 mm   1.00" / 25 mm      1.00" / 25 mm
   3rd:   2.00" / 51 mm   1.00" / 25 mm      1.00" / 25 mm
   4th:   1.00" / 25 mm   1.00" / 25 mm        -

- Armour deck: 4.00" / 102 mm, Conning tower: 14.00" / 356 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 127,185 shp / 94,880 Kw = 27.00 kts
   Range 9,000nm at 12.00 kts
   Bunker at max displacement = 4,674 tons

Complement:
   1,746 - 2,271

Cost:
   £10.833 million / $43.330 million

Distribution of weights at normal displacement:
   Armament: 3,682 tons, 6.9 %
   Armour: 17,890 tons, 33.7 %
     - Belts: 7,203 tons, 13.6 %
     - Torpedo bulkhead: 1,221 tons, 2.3 %
     - Armament: 4,136 tons, 7.8 %
     - Armour Deck: 4,905 tons, 9.2 %
     - Conning Tower: 426 tons, 0.8 %
   Machinery: 4,739 tons, 8.9 %
   Hull, fittings & equipment: 20,715 tons, 39.1 %
   Fuel, ammunition & stores: 5,598 tons, 10.6 %
   Miscellaneous weights: 400 tons, 0.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     62,662 lbs / 28,423 Kg = 37.1 x 15.0 " / 381 mm shells or 9.1 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 9.1 ft / 2.8 m
   Roll period: 16.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.64
   Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.650
   Length to Beam Ratio: 6.01 : 1
   'Natural speed' for length: 26.85 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
     - Stem:      25.00 ft / 7.62 m
     - Forecastle (20 %):   23.00 ft / 7.01 m
     - Mid (50 %):      22.00 ft / 6.71 m
     - Quarterdeck (15 %):   22.00 ft / 6.71 m
     - Stern:      23.00 ft / 7.01 m
     - Average freeboard:   22.59 ft / 6.88 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.2 %
      - Above water (accommodation/working, high = better): 160.7 %
   Waterplane Area: 66,279 Square feet or 6,158 Square metres
   Displacement factor (Displacement / loading): 93 %
   Structure weight / hull surface area: 237 lbs/sq ft or 1,159 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.51
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

P3D · December 23, 2008, 04:17:02 PM

You just cannot get the superfiring gun count right.
Also, you might want to reduce the extent of the main belt. Better to have a bulkhead than the weight of a 18' high 15" thick armor plate at the extremities.
With 22' freeboard and 8' decks you have decks at 6' and 14' above WL. So your main belt depth should be (with 7' BWL portion) either 13' or 21'. Reducing armored belt length to ~600' would free up the weight for 21' high belt - your decks might be higher than 8'. Further reduction of MB length might give you tonnage for an end belt of reduced height and thickness.

Logi · December 23, 2008, 04:24:09 PM

My bad, my bad

QuoteBB00 Project - Proto, RRC Battleship Project laid down 1918 (Engine 1916)

Displacement:
   50,003 t light; 53,059 t standard; 55,719 t normal; 57,847 t full load

Dimensions: Length overall / water x beam x draught
   721.00 ft / 721.00 ft x 120.00 ft x 35.00 ft (normal load)
   219.76 m / 219.76 m x 36.58 m x 10.67 m

Armament:
16 - 15.00" / 381 mm guns (4x4 guns), 2,000.00lbs / 907.18kg shells, 1918 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 6.00" / 152 mm guns (8x2 guns), 108.00lbs / 48.99kg shells, 1918 Model
     Breech loading guns in deck mounts with hoists
     on side, all amidships
16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1918 Model
     Quick firing guns in casemate mounts
     on side, evenly spread
16 - 3.00" / 76.2 mm guns (8x2 guns), 13.50lbs / 6.12kg shells, 1918 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread
16 - 0.50" / 12.7 mm guns (8x2 guns), 0.06lbs / 0.03kg shells, 1918 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 34,457 lbs / 15,629 kg
   Shells per gun, main battery: 100

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.0" / 381 mm   600.00 ft / 182.88 m   22.00 ft / 6.71 m
   Ends:   Unarmoured
     Main Belt covers 128 % of normal length

- Torpedo Bulkhead:
      2.00" / 51 mm   500.00 ft / 152.40 m   35.00 ft / 10.67 m

- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.0" / 406 mm   9.00" / 229 mm      12.0" / 305 mm
   2nd:   3.00" / 76 mm   1.00" / 25 mm      1.00" / 25 mm
   3rd:   2.00" / 51 mm   1.00" / 25 mm      1.00" / 25 mm
   4th:   1.00" / 25 mm   1.00" / 25 mm        -

- Armour deck: 4.00" / 102 mm, Conning tower: 14.00" / 356 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 130,329 shp / 97,225 Kw = 27.00 kts
   Range 9,000nm at 12.00 kts
   Bunker at max displacement = 4,788 tons

Complement:
   1,813 - 2,357

Cost:
   £11.046 million / $44.183 million

Distribution of weights at normal displacement:
   Armament: 3,682 tons, 6.6 %
   Armour: 19,258 tons, 34.6 %
     - Belts: 8,250 tons, 14.8 %
     - Torpedo bulkhead: 1,295 tons, 2.3 %
     - Armament: 4,395 tons, 7.9 %
     - Armour Deck: 4,878 tons, 8.8 %
     - Conning Tower: 440 tons, 0.8 %
   Machinery: 4,856 tons, 8.7 %
   Hull, fittings & equipment: 21,678 tons, 38.9 %
   Fuel, ammunition & stores: 5,716 tons, 10.3 %
   Miscellaneous weights: 530 tons, 1.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     64,446 lbs / 29,232 Kg = 38.2 x 15.0 " / 381 mm shells or 9.6 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 8.1 ft / 2.5 m
   Roll period: 17.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.74
   Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.644
   Length to Beam Ratio: 6.01 : 1
   'Natural speed' for length: 26.85 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
     - Stem:      25.00 ft / 7.62 m
     - Forecastle (20 %):   23.00 ft / 7.01 m
     - Mid (50 %):      22.00 ft / 6.71 m
     - Quarterdeck (15 %):   22.00 ft / 6.71 m
     - Stern:      23.00 ft / 7.01 m
     - Average freeboard:   22.59 ft / 6.88 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 95.6 %
      - Above water (accommodation/working, high = better): 154.0 %
   Waterplane Area: 65,915 Square feet or 6,124 Square metres
   Displacement factor (Displacement / loading): 95 %
   Structure weight / hull surface area: 246 lbs/sq ft or 1,203 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.56
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

Jefgte · December 23, 2008, 04:42:21 PM

QuoteMain Belt covers 128 % of normal length

IMO, your hull is too short for 1600 x 15" shells
& 27kts.

;)

Logi · December 23, 2008, 05:49:15 PM

really? I believe there is just enough room for the turrets and the 35' of depth for the ship can hold the machinery...

P3D · December 23, 2008, 05:55:14 PM

Room should be enough.

Jefgte · December 24, 2008, 02:08:27 AM

Quotereally? I believe there is just enough room for the turrets and the 35' of depth for the ship can hold the machinery...

Did you made a study drawing with all SS numbers ?

;)

P3D · December 24, 2008, 11:19:15 AM

Well, assume you need 1m3 for each shell+propellant (0.5mx0.5mx4m) and service spaces in the magazine. That'd be 1600m3. Which translates into a brick of 20mx5mx16m, so there should be enough space in a ship 36m wide 11m draft and 210m length.