WTB gears
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WTB gears

  1. #1
    Senior Member SoldHondaBoughtHondo's Avatar
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    Default WTB gears

    Looking for 28's - 32's for a 12* split case.
    Been running 40's for a long time.
    Somebody correct me if i am wrong....
    I had to cut a 16 pitch prop down to 10 7/8 to get my little motor to pull the gear. That got me 6200,(burn about 5500) put in more cam, ditched the dart/domi for a t/r and 660's, moved some weight around, tweeked and tuned the present motor combo best i could without spending a bunch of money..That got me to 6950 and 107mph. The math says that's a ton of prop slip.
    I am thinking that with less gear i can run more prop diameter, the prop will slip less = more efficient and more mph.
    Is that how it work?
    Cam should make power to at least 7400, I have 3 props that have more diameter...hoping for another 3mph..
    thanx
    mike
    "A liberal paradise would be a place where everybody has
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  3. #2
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Looking for 28's - 32's for a 12* split case.
    Been running 40's for a long time.
    Somebody correct me if i am wrong....
    I had to cut a 16 pitch prop down to 10 7/8 to get my little motor to pull the gear. That got me 6200,(burn about 5500) put in more cam, ditched the dart/domi for a t/r and 660's, moved some weight around, tweeked and tuned the present motor combo best i could without spending a bunch of money..That got me to 6950 and 107mph. The math says that's a ton of prop slip.
    I am thinking that with less gear i can run more prop diameter, the prop will slip less = more efficient and more mph.
    Is that how it work?
    Cam should make power to at least 7400, I have 3 props that have more diameter...hoping for another 3mph..
    thanx
    mike
    Since you have a hydro I'm not sure what slip should be for you but I figured you at 27.4% off what you posted. Typically more blade area equals less slip but contour and blade design matter too. what kind of slip do your other props show? If you have 2 other props I'd try them and see what they do for comparison.

    Sorry no 12* gears
    Quote Originally Posted by gn7 View Post
    Carnivalride, you really need to find some other hobby. You have no talent for this boat thing

  4. #3
    Senior Member SoldHondaBoughtHondo's Avatar
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    @ 11 1/4 it's 3800 wot.If i can spin 4200+ it runs hard. All of my props are Menkens and the blade shape is pretty much the same. I do have a 4 blade...3600 is wot. To much cam and not enough stroke (3.76) so it will always be a dog out of the hole. I'm from salt lake, i'm more of a salt flats kinda guy.
    Is excessive prop slip the same as giving hp away?

    In case it matters my 455 t/ram will spin a 11 3/8 to 5k easily with 40's @ 80mph and 5k with the 427 and 10 7/8 prop in 70-71
    thanx
    mike
    Last edited by SoldHondaBoughtHondo; 04-07-2014 at 11:50 AM.
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

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