frankly the concept of
using an RO system to make pure water to make hydrogen for a fuel cell seems
more like buzzword loading than viable technology.

that's because it is.

However, using electric motors that can regenerate through the propeller is
viable and is being done today.

no, it isn't.

You talk about "power in = power out", but doesn't that mean that you should
generate as much with the wind pushing the boat at 8 knots as you use when
the
motor is pushing it?

it certainly does. otherwise, it is supposed to generate more energy than it
consumes.

Add in a
small genset that can run very efficiently

yeah, sure. "very efficiently", as opposed to what they do today and are
likely to do for the next several centuries.

a fixed load and you have a very
viable system.

ah, no. you *must* build a WORKING model to take that to the US Patent Office,
for they require that in the case of perpetual motion machines.