Originally Posted by Velella99
Again thank you all for your perspectives. None of this is wasted a I'm going to do some investigation based on leads you've given me above. The physics fascinates me and the options entice me. Thanks again.
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What you want to look at are the axial piston, variable displacement
, reversible flow, closed system pumps. These are very quiet and the direction of flow and displacement
of the pump can be changed using a single
control, full ahead to full astern in milliseconds.
There is more choice with the motors but I tend to like the gerotor types for their simplicity and reliability
also they are pretty quiet. I have used vane type pumps and motors but they tend to work at lower pressures than the axial piston pumps and require larger piping to avoid pressure losses. The vane type pumps and motors are also fairly quiet and tend to be lower cost than the piston types. Whichever type you chose a closed loop system would probably be best in a boat