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Saturday, October 16, 2004

I'm doing some outrageous things to try and lower the GM

After calibrating my program for the Queen Elizabeth class, I am now wrestling with the ship specification for my GB/CB/1905 design to try and lower the metacentric height (GM). I have had only moderate success at this, but I do have the GM at the legend displacement below 10ft (!). I must admit that the ship has a low silhouette, given that it doesn't have superfiring turrets. There are just the forward and aft 12in/45 twin turrets with 9 single 6in/50 guns in armored shields. As things stand right now, this is what I have:

Designed draft=26.0604 ft
Hull Weight=10995.6 tons
Secondary Battery Weight=165.6 tons (includes protection)
Armament Weight= 1576.08 tons (includes protection)
Total Armor Weight=4097.17 tons
Machinery Weight=8428.57 tons
General Equipment Weight=750.0 tons
Normal Fuel Weight=750.0 tons
Maximum Fuel added Weight=1875.0 tons
Reserve Feedwater Weight=1075.28 tons
Legend Displacement=27392.4 tons
Legend Draft=28.5543 ft
Submergence of 1195.69 of actual displacement per foot
At Displacement=27392.4
Length=770.0 ft
Beam=85.0 ft
Draft=28.5543 ft
Cp=0.54
Cm=0.95
Cb=0.513
At Displacement=27392.4 tons
DLR=60.001
Wetted Surface=73481.9
B/H=2.97679

At speed of 30knots power  is 104406.0 SHP
At speed of 31knots power  is 125104.0 SHP
At speed of 32knots power  is 147027.0 SHP
At speed of 33knots power  is 170186.0 SHP
actual speed for 147500.0 SHP  is 32.0204

Metacentric height at legend displacement (GM)=9.36508

Waterline Coeff=0.661362

Block Coefficient=0.513

Stability Coeff (nu)=0.445718
Freeboard=24.9905
Draft=31.0095
Beam=85.0

Metacentric height at deep load displacement (GM)=10.4897

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