Anne
that sounds as though you are 'over propped' given the system you have. Of course lectrics are flexible and this could equally be said to be over volted or over geared, all those variables are load factors.
The solution is to reduce volts or use a reduction gear to allow the motor to spin to a higher proportion of its peak rpm under load, if those are quicker and cheaper solutions than changing the prop which could turn into a guessing game unless you have a "library" of props.
And/or the battery is near its limit and the increase in current suppresses the voltage sufficiently so that despite the extra current flow/torque/heat, higher rpms and more thrust cannot be achieved
Andrew
We went full throttle under the misconceived notion that, if 1/4 throttle was only giving us 950 rpm and 1 kt, full throttle should give us more. Erroneously, it seems. :-/
I have a CAL 2-29 with an Electric Yacht 180ibl motor.
Anne
--- In electricboats@yahoogroups.com, "acsarfkram" <acsarfkram@...> wrote:
>
> Hi Anne,
>
> I second Pat's suggestion to reset the motor/controller and restart at a reduced throttle setting. Why were you at full throttle? I don't think you were getting more than knot of boat speed more at full throttle compared to a 1/4 - 1/3 throttle setting. You should be able to motor many hours at a 20 amp draw or so. What kind of boat do you have?
>
> Mark
> Santa Cruz
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