Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...
Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...
Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...
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<strong>SSG</strong>(X) <strong>Design</strong> – VT Team 3 Page 61<br />
Weight (ltons)<br />
800<br />
700<br />
600<br />
500<br />
400<br />
300<br />
200<br />
100<br />
Empty Aux2<br />
Empty Aux3<br />
Empty ATT<br />
Empty Aux1<br />
Flood FTT<br />
<strong>SSG</strong>(X) Equilibrium Polygon<br />
Empty FTT<br />
Flood Aux1<br />
Flood Aux3<br />
Flood ATT<br />
Flood Aux2<br />
0<br />
-10000 -5000 0 5000 10000 15000<br />
Moment (ltons-ft)<br />
20000 25000 30000 35000 40000<br />
Figure 46 - <strong>SSG</strong>(X) Initial Equilibrium Polygon<br />
4.3.6 Necessary Modifications and Baseline Equilibrium Polygon<br />
All of the loading conditions need to be inside of the polygon. The CGs of all of the components can be moved<br />
to accomplish this task. The compensating fuel tank and the clean fuel tank must be moved so that their CGs are the<br />
same. This needs to be done so that when all of the fuel was used, there would be no extra moment created by<br />
having salt water in the compensating diesel tank and an empty clean fuel tank. The amount and position of the lead<br />
can also be altered to move all of the loading conditions inside of the equilibrium polygon. The position and size of<br />
all external and internal tanks can also be changed.<br />
4.3.7 Normal Surface Condition<br />
Table 41 summarizes the normal surface condition. The normal surface calculations are computed using the<br />
displacing volume of the submarine. This displacing volume includes the pressure hull, ballast tanks, hydrogen<br />
tanks, sonar dome, propulsion system, torpedo tubes, and any other miscellaneous outboard volume. The envelope<br />
hull is not included in the displacement calculations. Due to the complex shapes of the displacing volumes, the<br />
Rhino Marine plug-in is used to calculate the transverse and longitudinal stabilities. Rhino Marine is also used to<br />
plot the curves of form for <strong>SSG</strong>(X). The reserve buoyancy calculations are determined by how much buoyancy is<br />
not in use by the MBTs (Main Ballast Tanks) when <strong>SSG</strong>(X) is on the surface. The reserve buoyancy for the <strong>SSG</strong>(X)<br />
is 3.6%, with a draft of 26 ft and a length on the waterline (LWL) of 233 ft. The submarine exhibits transverse<br />
stability with a metacenter 3.3 ft above the center of gravity and longitudinal stability with a metacenter 103 ft above<br />
the center of gravity. Figure 47 shows the curves of form.<br />
Table 41 - Summary of <strong>SSG</strong>(X) Surface Condition<br />
Description Surface<br />
Condition<br />
Δ 3312 lton<br />
LWL 233 ft<br />
T 26 ft<br />
B 31 ft<br />
GMT 3.3 ft<br />
GML 103 ft<br />
Reserve Buoyancy 3.6%