Gears have losses unfortunately
The decisions of form factor are largely due to availability of materials vs manufacturing tools thus motors have a series of common sizes. If you look at the gossamer condor you see the propellor was a custom job and perhaps if efficiency is very important and fabrication and shipping not important something quite different would be superior for the boat prop as well. Likewise the motor and its rpm and torque.
The Australian photovoltaic car competition - the Aussie entry was 97% efficient if memory serves. I think most commercial stuff is mid eighties
--- In electricboats@yahoogroups.com, "Ron" <rlgravel@...> wrote:
>
> HP will not increase, a gear reduction drops the output speed and increases the twist force on a slower turning application.
>
> --- In electricboats@yahoogroups.com, "Daniel" <nov32394@> wrote:
> >
> > Hello I just joined. I own a Pearson Triton 28' sailboat that I plan on using electric power for. I have a small amount of information but I always like more. One of the biggest questions I need answered is the speed of the motor. Lets start out with a golf cart type motor. Does it have the same power at 800 rpm as it does at 1,600 rpm? Do you want to use a reduction drive on an electric motor if you are going to run it at a slower speed?
> >
> > Does an Electric motor work the same as an ICE as far as gearing it down? With an airplane you get more hp the faster the engine goes so putting a reduction gear on gives you more hp.
> >
> > Dan
> >
>
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