T-Pain Is On A Boat: Re: [Electric Boats] Trolling motors ==> electric outboards

Friday, May 31, 2013

Re: [Electric Boats] Trolling motors ==> electric outboards

My ketch has a Norwegian Sabb (not Saab) Model G 10hp diesel that features a controllable-pitch 18" 2 blade prop. It's simple and reliable. The shaft moves longitudinally to change the pitch. The pitch is continuously variable from full reverse to full forward. They also offered a fully feathering version of this prop.

Sorry, it's no longer available. Sabb made this engine from 1948-2001, and I wish I had one in a crate for some future build. You do sometimes see these engines for sale used, including their prop and shaft. Maybe there's a dead one out there for sale cheap that has a good prop...

-Tom

--- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
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> Â I remember taking a ride in a Cessna 180. That variable pitch prop made a huge difference.
> Prop failure in a boat isn't as catastrophic as an airplane so why don't we see them?
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> ________________________________
> From: Dennis Wolfe <wolfeboats@...>
> To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> Sent: Friday, May 31, 2013 5:19 PM
> Subject: Re: [Electric Boats] Trolling motors ==> electric outboards
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> Â
> A trolling motor that produces, say 50# thrust at zero boat speed would produce zero thrust at 6 or 8 mph. Double the prop pitch and thrust at zero speed will drop while thrust at 8 mph will increase. Motor power is the same regardless.Â
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> On Friday, May 31, 2013, danbollinger wrote:
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> >To a physicist, they are very different concepts. Thrust is a rotational unit of force. Power is a unit of work.
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> >Energy / Time = Power
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> >--- In electricboats@yahoogroups.com, John Francis <surv69@> wrote:
> >>
> >> I don't understand how someone can say THRUST is not power, since the
> >> THRUST that an engine, along with gearing and a propeller, is the wash that
> >> is produced as yourr boat moves forward . . . and of course, what we're all
> >> looking for is to move our boats forward.
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> >> On Thu, May 30, 2013 at 10:48 PM, John Riehl <riehlj2002@> wrote:
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> >> > By contrast, I attempted to use a 36 lb thrust MinnKota on a 1,800 lb 22'
> >> > MacGregor. It would move the boat, but couldn't push it against anything
> >> > more than about 10 kts of wind.
> >> >
> >> > *From:* Skip von Niederinghausen <farharbour@>
> >> > *To:* electricboats@yahoogroups.com
> >> > *Sent:* Thursday, May 30, 2013 6:49 AM
> >> >
> >> > *Subject:* [Electric Boats] Re: Trolling motors ==> electric outboards
> >> > **
> >> >
> >> > Maybe I should mention to the group that years ago, I used a Min Kota
> >> > 24lb thrust trolling motor on my International Folkboat which was 26'
> >> > LOA and displaced about 5000lbs. This was in Annapolis Maryland where
> >> > there is little tide or currents. The motor was great for getting off the
> >> > dock at my house, then under the Eastport Bridge and out into the bay. I
> >> > used her for only overnight trips in the area and this system worked fine
> >> > for this limited use.** **Skip**
> >> > **-- **"The sky hides the night behind it and shelters the people beneath
> >> > from the horror that lies above."** -- Paul Bowles<http://www.goodreads.com/author/show/7659.Paul_Bowles>
> >> > ****
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