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post #1 of 31 Old 07-13-2010 Thread Starter
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propeller brake ?

my boat has no propeller brake, this means the propeller is constantly turning when the boat is in motion right?

if so then the bearings and bushings take a constant strain, what do you guys do about it?
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post #2 of 31 Old 07-13-2010
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post #3 of 31 Old 07-13-2010
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What model transmission do you have? Usually if you put your gear shift lever in the opposite of your direction of travel the prop won"t spin. I shut my engine off with the gear in forward, then put it in neutral and it won't spin. I understand, except for the noise, the spinning prop won't do any harm anyway.

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post #4 of 31 Old 07-13-2010
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depends on the transmission. Some can clearly be damaged by the prop spinning, since they don't get the proper lubrication.

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What model transmission do you have? Usually if you put your gear shift lever in the opposite of your direction of travel the prop won"t spin. I shut my engine off with the gear in forward, then put it in neutral and it won't spin. I understand, except for the noise, the spinning prop won't do any harm anyway.

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post #5 of 31 Old 07-13-2010
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Actually not a simple answer. Depends on the engine/transmission. Some Yanmar manuals state that you should let it spin and that you can damage the transmission by putting it in reverse. Some state the opposite. I sailed on one boat that used a vice grips to lock the shaft with the two bladed prop in line with the keel. There is also a fancy locking device you can buy. If you have a folding or feathering prop you can safely put the engine in reverse. Anything else and you need to see what is recommended by the manufacturer.

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post #6 of 31 Old 07-13-2010 Thread Starter
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il take the magnetic strap brack systhem from an old stationary bike.
should be an easy fix directly on the shaft from the inside.
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post #7 of 31 Old 07-13-2010
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Darn it, I know this has been talked about a lot, to ad nausium however I maintain there is more drag in a spinning prop, at least in the air. I do not mean feathering which is entirely different. I mean a fixed-pitch prop.

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Jerry—

Maine Sail did a test... and no, there isn't, at least for a fixed prop on a boat.

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post #9 of 31 Old 07-13-2010
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Another drag test, here is a link that is pro your point.

http://www.catamaransite.com/propeller_drag_test.html

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Last edited by jerryrlitton; 07-13-2010 at 08:09 PM.
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post #10 of 31 Old 07-13-2010
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Quote:
Originally Posted by jerryrlitton View Post
... I maintain there is more drag in a spinning prop, at least in the air. I do not mean feathering which is entirely different. I mean a fixed-pitch prop.
It depends on the precise shape and pitch of the prop. It does work for helicopters with their rotors correctly pitched (and gyrocopters, and maple seeds, etc.). However, a boat prop would only create more drag when spinning IF there a concomitant increase in "lift" along the aft surface.
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