USS HENRY CLAY SSBN-625
SECONDARY PROPULSION MOTOR
Here is the ship's "outboard motor."
It was called the Secondary Propulsion Motor
or "SPM." Its main use was for moving the ship in harbors when tugs were not
available. It was lowered from its stowage area, about two thirds of the way back
from the bow, and could be turned 360 degrees so that it could move the ship in
any direction. The SPM was normally retracted into its stowage area and rarely
To see an enlarged version (269 KB), click on the picture.
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© 2007 Gerald A. Pollack