Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

SSG(X) Design – VT Team 3 Page 90
Weight (ltons)
800
700
600
500
400
300
200
100
Empty Aux2
Empty Aux3
Empty ATT
Empty Aux1
Flood FTT
SSG(X) Equilibrium Polygon
Empty FTT
Flood Aux1
Flood Aux3
Flood ATT
Flood Aux2
0
-10000 -5000 0 5000 10000 15000
Moment (ltons-ft)
20000 25000 30000 35000 40000
Figure 91 - Initial Equilibrium Polygon with Loading Conditions
Once the loading conditions were positioned on the plot with the polygon, the next task was to get all of the
points inside of the polygon. The CGs of all of the components were moved to accomplish this task. The
compensating fuel tank and the clean fuel tank were both moved so that their CGs were the same. This was done so
that when all of the fuel was used, there would be no extra moment created by having salt water in the compensating
diesel tank and an empty clean fuel tank. The amount and position of the lead was also altered to move all of the
loading conditions inside of the equilibrium polygon. The position and size of all external tanks were also changed.
4.9.2 Final Weights
The LCB of the ship was taken to be at the volumetric center of the buoyant volumes of the submarine. The
LCB is 119 ft. from the bow. A summary of the weights by SWBS code and the lightships weight are listed in Table
58. The weights spreadsheet organized by SWBS (single and multi digit codes) is provided in appendix F.
Table 58 – Final Lightship Weight Summary
SWBS Group Weight (lton) VCG (ft) LCG(ft) (fwdLCB)
100 1220 -0.29 3.66
200 335 -2.55 -50.1
300 45.0 -2.40 -33.4
400 160 1.52 76.5
500 178 1.09 -0.62
600 58.0 0.73 9.52
700 50.0 0.55 32.0
8 (Lead) 315 -15.0 27.0
F10 3.11 0.00 -10.2
F20 87.0 0.28 33.8
F30 5.27 4.24 63.4
F40 841 -5.64 -13.3
F50 16.0 -20.0 -7.65
Total (LS+8) 2360 -2.34 3.80
Condition A 2360 -2.34 3.80
Condition A-1 2045 -0.39 0.23
NSC 3310 -3.18 0.28