Very odd... I have a Minn-Kota 40 on a 17' canoe, and can get nearly 5 mph with two persons aboard. I think I'm using their "Weedless Wedge" prop which may have more pitch than their "Power Prop".
I agree that trolling motor props are designed for thrust and not speed. A higher pitch would increase speed but would also increase the amp draw and MIGHT burn out the motor. I think an ammeter would be in order to monitor the amps.
I've hunted for an aluminum prop that I can tweak, but so far no luck.
Willie
--- In electricboats@yahoogroups.com, Dennis Wolfe <dwolfe@...> wrote:
>
> Neither motor was producing it's rated thrust output; both were
> producing the same power - as much power as it takes to push your boat
> 2.55 mph.
>
> Tie your boat to the dock, then they will produce their rated thrust.
> Trolling motors have very low pitch props, around 4", so they can push
> heavy fishing boats slowly. You would want maybe a 6 or 8" pitch prop
> to get the motor to produce its rated output on a light easily driven
> hull like yours.
>
>
>
> On 6/12/2011 10:24 PM, storm wrote:
> >
> > I had an interesting experience with my Newport 16 sailboat. I have a
> > 28 pound and a 50 pound thrust Minkota trolling motor. I went out to
> > see what the battery life on a 12V NiCad battery pack would look like.
> >
> > Anyway, I hooked up the 28 lb thrust and measured 2.5mph on my GPS.
> > With the 50 lb thrust I hit 2.6 mph!
> >
> > There isn't enough data to draw any conclusions but it was interesting.
> >
> > I will have to hook up some instruments to figure out if there really
> > was an almost doubling of power that produced a negligable increase in
> > speed.
> >
> >
>
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