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Thread: prop size and pitch

  1. #1
    Join Date
    Dec 2002
    Location
    Conshohocken, PA
    Posts
    109

    prop size and pitch

    I have a Yamaha 6 that has a long shaft, but a prop that seems more appropriate for a planing hull than a displacement type. It doesn't dig in and shove the way it should. RPMs are higher than they should be and when I use reverse to slow or stop the boat, the prop doesn't have much bite on the water.

    Any suggestions?

  2. #2
    Join Date
    Sep 2001
    Location
    Asst. Vice Commodore, NorthEast Fleet, Commander Division (Ret.) Brightwaters, N.Y.
    Posts
    1,823
    Yamaha makes a high thrust/low pitch sailboat prop. Don't really know the specifics on it.

    I don't expect a whole lot of performance out of the engine in reverse

  3. #3
    Join Date
    Sep 2001
    Location
    Orinda, California
    Posts
    2,311
    CP's right, get the high thrust prop. And, don't expect an Ariel or Commander to back up . . .

  4. #4
    Join Date
    Dec 2002
    Location
    Conshohocken, PA
    Posts
    109

    Thanks

    I'll check with the Yamaha dealer and see what he has available. I'll report the specifics when I get them. I've been using a Merc 9.9 sailmaster which has much flatter pitch prop. When I used the Yamaha, I noticed the lack of braking power when I came into the gas dock.

    That was when I thought about the pitch issue.

    The Yamaha is a great engine and I want to use it because it is a 100/1 mix 2-stroke rather than the Merc's 50/1. But when I gave it a trial, I was made very aware that I was not comparing apples to apples. The prop seemed to be the most likely offender.

    The Merc is a good engine with an alternator and electric start, but ... the smoke ...

    I've been thinking about the Nissan 6, 4-stroke engine as a replacement for some time ... I just need the right prop on the Yamaha 6 to see how the boat will perform compared to the larger engine.

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