When my 40# MK motor was new I could get nearly 5 mph on an 18' double ended canoe with two persons on board. It wasn't any faster with only one person, so I did get the feeling that it had hit it's max RPM. I've been looking for an aluminum prop that I could tweak the pitch but so far haven't found one.
--- In electricboats@yahoogroups.com, oak <oak_box@...> wrote:
>
> So far, my experience seems to confirm the previous statements that trolling motors hit a max speed at the motor max rpm.
> Â
> The suggestion is that a 24V Minkota will only go so fast (rpm), and due to the pitch of the prop, the final speed of the boat can't exceed 3-4mph.Â
> Â
> I wish I had access to a small Jon boat for a day to confirm this.
> Â
> IF doubling the voltage of your 12V Minn-Kota doubles your RPM, and the boat is light enough that the motor doesn't overload and melt down, then you might be able to get greater speed.
> Â
> Otherwise, and a good bet in any case, is to change the prop to a higher pitch (though still gotta worry about final power required, which will translate to dissapated heat, which could melt down the motor or controller).
>
>
> ________________________________
> From: stmbtwle <stmbtwle@...>
> To: electricboats@yahoogroups.com
> Sent: Sunday, June 23, 2013 11:46 AM
> Subject: Re: [Electric Boats] Minnkotas
>
>
> Â
>
> Double the power, yes, but it's my understanding that the HEAT comes from the AMPS (could be wrong). However considering the cost of the mods and the uncertainty of the outcome, it might be better to simply get a 24v unit. My canoe should fairly fly!
>
> Willie
>
> --- In mailto:electricboats%40yahoogroups.com, "cire" <cirejay@> wrote:
> >
> > You still will have doubled your power - watts.
> >
> > eric SV Meander
> >
> > --- In mailto:electricboats%40yahoogroups.com, "stmbtwle" <stmbtwle@> wrote:
> > >
> > > Aye, there's the rub. Paddling a loaded canoe five miles against the tide is not my idea of fun; if it were I wouldn't bother with the motor!
> > >
> > > If I were to keep the total amps to no more than the motor was designed for (say with a circuit breaker) could I avoid this?
> > >
> > > Willie
> > >
> > > --- In mailto:electricboats%40yahoogroups.com, George Schnellman <vectorges@> wrote:
> > > >
> > > > DC motors are very forgiving of the voltage supplied. at no-load the rpm
> > > > will be directly proportional to the voltage., Double the voltage and you
> > > > double the rpm. Triple the voltage and you triple the rpm. This holds right
> > > > to the point 2 nanoseconds before the armature gets too hot and melts and
> > > > the operator says, "Wow, I didn't see that coming".
> > > >
> > > > Be careful how much voltage you apply. Generally you will shorten the life
> > > > of your equipment. It would not be fun to be an hour into a cruise and have
> > > > the motor melt and have to paddle back.
> > > >
>
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