The modules are arranged in eight groups of nine modules.
Each group of modules is mounted on a single water cooled heat sink
as shown in Figure 2. The module and heat sink assemblies are then
positioned on the octagonal outer surface of a cast steel center
support structure. This structure was sand cast from Ni Resist steel.
The interior surface of the casting is a circle about 5.75 inches in
diameter with heat transfer fins on the inside surface.
A hollow displacement body is place in the center of the
generator to force the exhaust gas flow close to the surface of the
support structure. This displacement body provided a better gas flow
distribution within the generator and can be easily changed in size to
match the exhaust gas flow rate of engines of various displacements