Re: [PSUBS-MAILIST] Hydraulic Drive Unit

["Walter Starck" <wstarck@ozemail.com.au>]

Using an electric motor to drive a hydraulic pump that powers a
hydraulic motor to turn a propellor to  propel a sub is a really
complicated way of doing what could be much better done by using the
motor to turn the propellor directly.  The latter is far cheaper, less
bulky, more reliable and more energy efficient.

Hydraulics are a good way to distribute power especially where high
force is required but they consume a lot of energy in themselves and
offer no advantage in this application.

Walter Starck
Golden Dolphin Video CD Magazine
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