Kevin,
You may want to consider a system where the diesel (or gas or propane or CNG) engine is connected to the prop shaft in parallel with the electric motor.
If you use a planetary gear system, you can drive the prop with either the motor or the engine or both at the same time.
If you put a brake on the prop shaft, you can back drive the motor with the engine and use it as a charger just like using the prop to charge the batteries.
A planetary gear system isn't the only way to do it. You could also use hydraulics. A hydraulic motor on the prop with electric and diesel pumps. You can use another motor on a generator to take power from the diesel or use the prop to drive it.
David
--- In electricboats@
>
> I'll be the first to admit I'm a hack--- no expert, but here's a thought.
>
>
>
> Instead of buying and off-the-shelf diesel generator, why not make one? Buy
> e-tek type motor with regen capability (thunderstruck?
> drive (get the correct speed) to something alike a carrol stream liquid
> cooled diesel (or even aircooled if you don't mind the noise and run some
> venting). This is in addition of course to your primary electric motor for
> propulsion. You could probably do it for about 2500. Still not cheap
> cheap, but less expensive then a commercial option.
>
>
>
> You use the regen to charge your bank as you draw on it. Possibly even hook
> up a bypass circuit and run the motor directly off the generator (just like
> the big cruise ships).
>
>
>
> The motor with regen would be much more efficient then an alternator (don't
> need to excite the coils) and probably doesn't cost a lot more then a high
> capacity alternator.
>
>
>
>
>
> Let the critique begin.
>
>
>
> Kevin
>
>
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