Well Minn Kotas have been around for quite some time, and it may be that the regulators weren't that cheap some years ago. Their more expensive motors do use PWM technology, and it may be simply that they're not motivated to go to the expense of redesigning the lower end of the line. There are only two "trolling motor" lines I know of, and it's my understanding they're now the same company. So you buy their product or you buy their product, or you paddle.
There are other motors, but considering their performance and price, it's comparing apples and artichokes.
--- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
>
>
>
> Â When you look at how cheaply you can put a buck regulator together I wonder why they did that.
> Â
>
>
>
>
>
>
> ________________________________
> From: matt elder <mattelderca@...>
> To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> Sent: Tuesday, May 28, 2013 4:30 AM
> Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
>
>
>
> Â
> The newer Minn Kota's with the selective 5 speed do indeed use a resistor pack.
> I have disconnected the resistors in my motors and I use a PWM golf cart controller for speed control.
> The resistors are potted into the front nose cone of the motor housing. Big coils of wire in epoxy with the metal nose of the motor as a heat sink. Very inefficient. The motors come apart easily and you can simply run better wires down directly onto the brush holders. Nice flexible 8 gauge silicone wire works great.
>
>
>
> Â
> mattelderca
>
>
> >________________________________
> > From: Arby bernt <arbybernt@...>
> >To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> >Sent: Tuesday, May 28, 2013 12:44:07 AM
> >Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >
> >
> >
> >Â
> >Roger that Roger.
> >I've only taken one old one apart, and it had large power resistors which had fried the crimp terminals and the rest of the plastic.
> >New ones must be built better...
> >
> >
> >Arby
> >
> >
> >
> >________________________________
> > From: Roger L <rogerlov@...>
> >To: electricboats@yahoogroups.com
> >Sent: Monday, May 27, 2013 9:34 PM
> >Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >
> >
> >
> >Â
> >
> >Â
> >Just back from a fishing trip. AÂ lot of
> time was trolling with a $209 (new price) Minn Kota.
> >Â
> >Speed is selected on the handle as step changes
> from 1 thru 5. Progressing from 1 to 4 gives roughly linear increments
> in boat speed. Setting #5 makes a huge jump in boat speed from
> setting #4. At least twice the speed increase, maybe even more....I
> wonder what causes that? No, I don't know the how and what of their throttle
> control. It seems fairly efficient.
> >Â
> >A Resistor? Are you sure? That
> seems enormously inefficient, but maybe they are. Not that I know because
>  I've never taken one apart to check just how it was made. My
> assumption was that they were some combination of electrical switching along
> with activating a different number of windings.
> >Next step might be to get some VOM info and
> then look at an oscilloscope picture. The Minn Kota has 12 discrete cogging
> points per rotation. Â
> >Â Â Â Roger L.
> >....
> >............
> >Â
> >----- Original Message -----
> >From: Arby bernt
> >>To: electricboats@yahoogroups.com
> >>Sent: Monday, May 27, 2013 8:08 PM
> >>Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >>
> >>
> >>There are two kinds of trolling motors, resistor throttle and PWM (electronically switched). Resistor throttles are inexpensive and have poor efficiency at low speeds. PWM offers good efficiency over the range of operation. Both systems have similar efficiency at wide open throttle. PWM motors tend to be built better, as they serve a premium market. Salt water compatibility is another important issue, as metals designed for fresh water can corrode in the presence of salt water.
> >>My advice would be to troll garage sales for a substantial savings....
> >>
> >>
> >>Arby
> >>
> >>
> >>
> >>________________________________
> >> From: justaflsailor <sbl12@...>
> >>To: electricboats@yahoogroups.com
> >>Sent: Friday, May 24, 2013 2:20 PM
> >>Subject: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >>
> >>
> >>
> >>Â
> >>I was curious if anybody has done this as to not reinvent the wheel.
> >>The oat is 16ft almost canoe/ kayak shaped. It weighs about 140
> lbs.
> >>I had thought about using a cut down trolling motor, but heard they
> were innefficient. If somebody has in their opinion the best set up, I would
> love to hear.
> >>
> >>
> >>
> >>
> >
> >
> >
> >
>
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