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What in the world does the flare back end on props do? Reduce blow-out? Me and my buddy are discussing possiblities on AIM right now. We are puzzeld.

Some props just are rounded circular all the way end.....but some commonly found on SS props have an end that flares outward.

does that serve a purpose?
 

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It reduces the amount of exhaust gas that enters the prop blade area when reversing. The flare creates more backpressure in the hub, blocking more exhaust which is re-routed out the exhaust relief port above the water line, thus allowing better thrust in reverse.
 

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It apparently serves two purposes.

This is a patent description for a new design, but the background gives some good info on the flare's second purpose.

http://www.patentstorm.us/patents/6267634/description.html
 

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[movedhere] General Discussion [move by] iMacattack.
 
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