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Props on a 1987 43' post?

Discussion in 'Post Yacht' started by postyachts139, Feb 23, 2019.

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  1. postyachts139

    postyachts139 New Member

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    Dec 30, 2017
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    Location:
    ny
    i have a 1987 43' post with 6-71 ti engines
    it has 24" props any body know the proper pitch to use
  2. Beau

    Beau Senior Member

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    If you're out on LI there are two good prop services who can tell you exactly what you need.
  3. Capt Ralph

    Capt Ralph Senior Member

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    Are you running now? What is your high idle and loaded WOT?
  4. porthole

    porthole Member

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    Jersey Shore
    My 42 with 6-71 TI's used 24x26 3 blades or 23x24 4 blade S&S Katapults. And the 4 blade Katapults are 4 sale.
  5. mwwhit1

    mwwhit1 Senior Member

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    Jersey City NJ\Boca Raton FL
    I'm runniing 24x25 with a heavy cup, 3 blades, on my 43. Really depends how much stuff you have on the boat. I get 2500 rpm with these. I have 450hp 671 TI's. You may have the 485's?
  6. postyachts139

    postyachts139 New Member

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    whats your cruise speed and rpm
  7. mwwhit1

    mwwhit1 Senior Member

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    I usually cruise 2000 rpm. That gives 20.5 to 21.5 knots, depending on conditions. 2100 is 22 to 23 knots.
  8. Capt Ralph

    Capt Ralph Senior Member

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    postyachts139, What numbers are you getting?
  9. Beau

    Beau Senior Member

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    Prop size, pitch and cup are all particular to each boat. My thought is that on a boat with a clean bottom, load as you would usually run, recently serviced engines that your top end should be 50-100 RPM of the recommended top end. Performance will deteriorate as the season progresses. Don't chase it as the season move on, but recognize that you may want to pull back a bit. In the Autumn youre hull will be heaviear with water and growth