Hi Dave,
Very cool - you didn't mention, but I'm sure see, the very sharp inflection in a graph of the data below 2knots and again above 5knots. Above that point, each additional knot is requiring ~ .7KW of power. Below, that, each knot is only requiring about ~.2KW (it's not linear of course). So the trick is in seeing what can be done to push that sweet-spot into the higher speeds. If you could sustain it to 6knots, for example, you'd have a range of about 32 miles (and at a pretty good clip to boot). Hopefully your work on cavitation and drag will prove fruitful!
-Keith
--- In electricboats@yahoogroups.com, "davecanoehead" <elderton@...> wrote:
>
> Hi all, here is some preliminary speed VS. range data on sparky. She is based on a Hobie 16 platform, 5 KW outboard conversion, 5 KW/H lithium batteries. Range assumes 100% discharge.
>
> 1 knot/90 watts/55 miles
> 2 knots/127 watts/78 miles
> 3 knots/223 watts/67.2 miles
> 4 knots/396 watts/50.5 miles
> 5 knots/660 watts/37.87 miles
> 6 knots/1440 watts/20.8 miles
> 7 knots/2100 watts/16 miles
> 8 knots/2900 watts/13.8 miles
> 9 knots/3650 watts/12.3 miles
>
> She still needs more work around the prop and leg to minimize cavitation etc. so we may get slightly better numbers going forward.
>
> Best,
>
> Dave E
>
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