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  1. #1
    Join Date
    Jun 2007
    Location
    Murfreesboro, TN
    Posts
    237

    Default more top end speed?

    Looking advice on getting a fer more top end speed

    Why

    I barefoot and my fat butt needs to go faster, or lose weight. The weight loss isn't working so I need to speed the boat up.

    I have a 2007 Outback with about 100 hours on it. When I took it in for the 100 hour oil change and service I asked the dealer about a prop to get more top end speed, but they could not decide what I needed.

    One guy said go up in pitch the other said down, they were still discussing it and I just walked off.


    opinions?

  2. #2
    Join Date
    Oct 2007
    Location
    Panama City Florida
    Posts
    1,798

    Default

    Not sure what you pitch is now? But to gain more distance per revolution you must increase your pitch. If a prop says 13 x 13 that is the diameter and the pitch with the pitch being the amount of forward travel in inches per revolution. So a 13" pitch goes 13" per revolution and a 14" goes 14". Inboards are around 13/14 Outboard props are 15, 17, 19, 21 and 23 but remember an outboard goes thru a gear box and is NOT a one to one drive.

  3. #3
    Join Date
    Aug 2004
    Location
    Lake Hickory, North Carolina
    Posts
    1,390

    Default

    You want to go up in pitch to a 17 or a 19. It'd be best if you could find someone who'd let you try b4 you buy.
    .
    The 19 may be pushing it, though.
    .
    Hope this helps
    .
    B
    Learn all you can today. Tomorrow you may need to know it!
    .
    2004 Moomba Outback. Tower Speakers, amp, ballast, ssrr ... she's a cutie!

  4. #4
    Join Date
    Jan 2003
    Location
    Minnesota and Wisconsin
    Posts
    1,197

    Default

    How much speed are you looking for? I have seen comments, either here or on Skifly, that these hulls are designed for max of about 46-48. Take that with a grain of salt....

    If I understood it correctly, as the boat tries to go faster the hull actually starts to come down and thus increases drag, thus limiting speed.

    I did not even know you could get a 19 for an inboard?

    Maybe stainless might be a choice?

    Are you long line or on a boom?
    If you believe something to be true, it will be - in it's consequences.

    2009 MasterCraft ProStar 197 - DD - 5.7L - 325HP - Zero Off

  5. #5
    Join Date
    Dec 2006
    Location
    tally, fl
    Posts
    283

    Default

    more pitch = more top end until you run out of horsepower... I'm with butta try b-4 you buy. If you are running a 13 pitch now try to jump to 15 and work from there. how much mph do you feel you need?

  6. #6
    Join Date
    Aug 2004
    Location
    Lake Hickory, North Carolina
    Posts
    1,390

    Default

    Word of caution.....more pitch will also pull engine rpm's down some, so it'll have to be a balancing act. Good advice on starting with the 15...it may do the job just fine.
    .
    B
    Learn all you can today. Tomorrow you may need to know it!
    .
    2004 Moomba Outback. Tower Speakers, amp, ballast, ssrr ... she's a cutie!

  7. #7
    Sled491 Guest

    Default

    everthing is a trade. More speed = less hole shot. Try calling the boys at OJ props, they'll talk to you and if they can't firgure this out for you no one can. PS you were right to walk away from a mechanic that thinks less pitch = more speed. More blades won't do it for you either so don't get sucked into that one either. If pitch won't get you there they might have something in the blade or cup design that would work for you

  8. #8
    Join Date
    Oct 2005
    Location
    Durham, NC
    Posts
    649

    Default

    I agree with sled, call OJ and they will tell you exactly what you need, that way, you won't have to make and educated guess.

  9. #9
    Join Date
    Jan 2008
    Location
    Pensacola, FL
    Posts
    1,585

    Default

    If we are to believe the folks at Waterski Magazine, they say the prop on the 08 Outback is a 13"x11 prop. You should determine your starting point before moving up in prop size. So perhaps a 13 or 14 pitch prop would do the job, if you are starting with an 11 pitch prop.

    Please remember to post your results once you get the new prop.

  10. #10
    Join Date
    Oct 2007
    Location
    Panama City Florida
    Posts
    1,798

    Default

    Not saying you are wrong but maybe the magazine? Seems like the standard inbooard skiboat (DD) prop for the last 20 years was a 13x13? We are talking about direct drives and old but well proven American V-8 engines, whether it be the Ford Windsor 351 or the Chevy 350, they turn about the same RPMs. You would usually see that the top ends of all these boats was from 45 to 48mph.

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