Good info Jeremy,
Since you quoted power predictions for your boat at 5 kts, I was wondering if you had collected any data for that speed.
And you quoted for prop efficiency at about 86% (measured). How did you measure that? I'm curious to see if there is some way that I can figure that out for my prop while it is installed on my boat. The rest of my system sounds close to yours, Lithium batteries, controller, gear box, stuffing box, etc. though I'm operating my motor in the 80-85% efficiency range according to the manufacturer.
Thanks,
Eric
--- In electricboats@yahoogroups.com, "Jeremy" <jeremy_harris_uk@...> wrote:
>
> .... Overall it's pretty close, although my total system efficiency is better than 50%; I have a prop efficiency of just under 86% (measured.... Overall, my system efficiency is better than 75%.
>
> Normal cruise speed is 4mph on our inland waterways (which happens to be the speed limit in most places) and the system will sustain this with an input power of about 70 to 80 watts, although this can easily increase to over 100 watts with any sort of head or side wind....
>
>
> Jeremy
>
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