On 31/05/11 08:56, Beau wrote:
> Hi,
>
> I have an older Duffy 21 Electric Boat with a 36 Volt System. This morning after an hour long full speed run she just quit. Would not go forward but would go in reverse, made for an interesting trip home.
Sounds like the thermal protection kicked in for the controller. It
probably only needed 30 minutes or so to cool down.
It's probably also worth not running 'full speed' all the time. Back
off the throttle a touch from maximum. Going just a touch slower can
significantly reduce the power consumption. (And waste heat production -
that heat is power not used for propulsion).
I've seen a rental electric boat where it's owner has put a screw into
the throttle control to stop hires from running the motor at full power
all the time. He took the limiter off when demoing the boat to me and it
was clear that while the power consumption went up significantly at
'Wide Open Throttle', we didn't get much extra speed over the limited
position he'd chosen.
> About 6 hours later I went out to see if the prop was fouled but when I tried the throttle everything was working fine in both forward and reverse.
It had cooled down and reset. It probably didn't need 6 hours :-)
> Anyone had this problem?????
> Any ideas where to start????? As you can imagine my wife is not thrilled to take the boat out. Mayday, Mayday, Mayday!
Find where the motor controller box lives. If the enclosure is force
ventilated, the fan may have failed and/or the grills blocked with crud.
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