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132
THE SUBMARINE TORPEDO BOAT
construction, and will drive generators for supplying cur-
rent to induction motors connected to the propeller
shafts. This would permit of a greater speed range and
would eliminate starting and reversing troubles, as well
Engine Space, experimental boat built by the L. A. Submarine Boat Co.,
showing single unit plant power
as to cause the constructor less worry about the proper
distribution of weights as affecting the trim of the boat.
The size and weight of the motors could be kept down by
using polyphase alternating currents of high frequency,
or direct currents of high voltage, say 500 volts for sur-
face work, and if used from storage batteries as at pres-
ent when submerged this could be cut down to 250 volts.
By the elimination of the storage batteries the same
voltage submerged as on the surface would be used.