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Old Jun 28, 2007, 01:37 PM
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Joined Jul 2006
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Prop rotation question

I have a 6 volt car fan motor with a 1/4" shaft and 3" diameter motor, that goes clockwise when looking at the shaft. Do I need a right hand prop or a left hand prop? I'am building a 8" wide by 24" long boat. Thanks Dan
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Old Jun 28, 2007, 06:15 PM
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United States, TX, La Porte
Joined Apr 2007
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Right hand
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Old Jun 28, 2007, 06:27 PM
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Motor City
Joined Dec 2004
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No problem either way... just reverse the polarity to the leads, it'll go the other way.

But, umm, sure you want to use that beast of a motor? A MUCH smaller motor should do the job in that sized boat.

Pat M
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Old Jun 28, 2007, 06:53 PM
master boat slacker
USA, NY, Mastic Beach
Joined Feb 2006
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when is a motor that size really needed? in a
amsterdam or smit nederland? or bigger tug?? just wondering
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Old Jun 28, 2007, 07:02 PM
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Portugal
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The amsterdam uses two class 500 motors, like the rotterdam, with more then enough power.
What is the boat your using this motor on ?
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Old Jun 28, 2007, 09:27 PM
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patmat2350
How do I reverse the polarity to the leads?
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Old Jun 28, 2007, 10:02 PM
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Dan- tell us about your boat, we can make a much better recommendation on the motor and prop. Speedboat? Tugboat? Bait dropper?
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Old Jun 28, 2007, 10:49 PM
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Thinking of building a Chris craft style boat 24"x8"
Prop size?
Motor 6 volt car fan motorcost $5.00
Battery 6 volt 10 amp cost $16.00
Boat will be a foam core mold with 1/8" wood glued to the foam mold then covered with mahogany veneer and 2 oz fiberglass cloth.
All this is in the planning stages. Trying to stay on the cheap side.
I have a Futaba 2PL AM radio and a Hitec 1/4 servo for the rudder.
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Old Jun 28, 2007, 11:48 PM
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Euclid, Ohio, United States
Joined Sep 2004
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Most of the Dumas Chris Crafts are about 30" long and 7-9" wide. The recommended motor is a 540 size, about 1.5" diameter with a 1/8" shaft. Prop size is about 1.5" . A 6 cell 7.2V NiCd or NiMh battery works well in the boats. The DUmas kits are built plank on frame (or bulkhead) and mostly double planked. First layer is 1/16" ply laid on the diagonal or some expanded PVC foam (Sintra).

The Hitec 1/4 servo is overkill for the rudder, a standard servo is sufficient.

Connect the battery leads to the motor, if the motor is spinning the wrong direction, reconnect the battery leads to the other motor leads.
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