Prop or not enough hp?

Discussion in 'Prop Shop' started by out-cast, May 17, 2009.

  1. out-cast

    out-cast Well-Known Member

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    I have a classic cc with a 15hp 4stroke yamaha. It's currently running with a 9 1/4 x 11 alluminum. When I fish alone I am able to get the rpms up to 5400 and a speed of 21 with an SE200 stabilizer. When I fish with a second person I can't get the rpms over 4900 @ 16mph. I know the SE200 slows me down a little, but how can I gain back those rpms? 9.5x13?
     
  2. TomFL

    TomFL Well-Known Member

    To gain RPM with the prop you are going the wrong way. Lose an inch or two.

    -T
     

  3. out-cast

    out-cast Well-Known Member

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    Do I stick with the same diameter? Would a 9x9 be ok to run with just me or do I risk too high of rpm?
     
  4. noeettica

    noeettica Well-Known Member

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    I ran the Same motor on a Tiller Classic ...

    2 people I Ran the 10.5 ... By myself I could bang the Rev-Limiter ....


    But that was a High time Motor ... It Did run pretty Sweet Though ... But I could Hit 24 Mph Though ...

    Dave
     
  5. Brett

    Brett > PRO STAFF <

    engine specs:

    http://www.yamaha-motor.com/outboard/products/subcatspecs/5/specs.aspx

    Specs say the power band is 5000-6000 rpm
    You're running 4900 with a heavy load, 5400 with a light load.
    You've got everything correct right now.
    I wouldn't change anything.
    Unless you just feel like spending money.
     
  6. noeettica

    noeettica Well-Known Member

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    Yamaha has changed the 15 Hp Used to be the same as the 9.9

    I have a 9 pitch as a spare No where near enough prop
     
  7. out-cast

    out-cast Well-Known Member

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    She's maxed out? Getting closer to 6000 won't help?
     
  8. Flyline

    Flyline Won &quot;Do More With Less&quot; Award!

    Looks like u have a 9 1/4" x 11" pitch "J-1" model that has a wide blade surface that's slow u down some.

    U need a 9 1/4" x 10.5" pitch "J" model that has a thinner blade surface and it will gain more RPM and better speed.

    I had both on my NMZ with 15hp yami 2-stroke and I like 10.5" (J-model) a lot better than 11" (J-1) model.

    It's makes go quicker, faster and good overall performance than 11" wide surface blade.
     
  9. noeettica

    noeettica Well-Known Member

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    Yup Blake is right :) 10.5 With 2 People ...
     
  10. out-cast

    out-cast Well-Known Member

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    How about a recommendation on a name? Michigan Match? Sorry, I've never bought a prop before. :D
     
  11. noeettica

    noeettica Well-Known Member

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    OEM Yamaha About $65.00

    http://www.boats.net/parts/search/Yamaha/Outboard/2003/F15PLHB/parts.html

    But ... if you Want the very best Contact the Skiff Shop ....

    Dave
     
  12. out-cast

    out-cast Well-Known Member

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    Anyone have a prop I could try/borrow?
     
  13. Taterides

    Taterides Well-Known Member

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    On my LT 25 I had 9 1/4 x 10.5. That was the sweet spot for my ride all around. I also used the SE200. Pretty sure you will be satisfied.
     
  14. out-cast

    out-cast Well-Known Member

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    With a 15hp?
     
  15. Flyline

    Flyline Won &quot;Do More With Less&quot; Award!

    Yes he had a 15.