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

SSG(X) Design – VT Team 3 Page 53
4 Concept Development (Feasibility Study)
Concept Development of SSG(X) follows Concept Exploration. In Concept Development the general concepts
for the hull, systems, and arrangements are developed. These general concepts are refined into specific systems and
subsystems that meet the ORD requirements. Design risk is reduced by this analysis and parametrics used in
Concept Exploration are validated.
4.1 Hull Form
4.1.1 Envelope Hull
Section 3.1.1 describes the hullform alternatives. Table 36 provides a summary of the optimization results and
the baseline characteristics of the SSG(X). The overall diameter of the envelope hull is 31 feet; the length is 257.3
feet, giving a length to diameter ratio of 8.3. The beam was adjusted to 31 feet so that the beam to diameter ratio is
1. The symmetrical submarine is more producible and structurally efficient.
Table 36 – SSG(X) Envelope Hullform Characteristics
MOGO Baseline
D 31 ft 31 ft
B 31.3 ft 31 ft
L 257.3 ft 257.3 ft
nf 2.71 2.71
na 2.11 2.11
Δ 144401 ft 3 135811 ft 3
The MIT teardrop hullform model was used to generate offsets for the outer hull; these hand calculations are
shown in Figure 39. The length of the forebody is 74.4 ft; the length of the parallel midbody is 71.3 ft; the length of
the aft body is 111.6 ft. Figure 37 - Figure 39 show the calculations of the hullform offsets, volume and surface
area.
Figure 37 - Hullform Calculations