Quick Prop question...what does the flare-end do?

Discussion in 'Prop Shop' started by choppercity47, Apr 14, 2009.

  1. choppercity47

    choppercity47 Well-Known Member

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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?
     
  2. B.Lee

    B.Lee Well-Known Member

    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.
     

  3. B.Lee

    B.Lee Well-Known Member

    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
     
  4. choppercity47

    choppercity47 Well-Known Member

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    I love forums......better than Google......thanks
     
  5. iMacattack

    iMacattack busy, too busy

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    [movedhere] General Discussion [move by] iMacattack.