Cheetah stiletto prop reconmendation
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Cheetah stiletto prop reconmendation

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    Senior Member Scapegoat's Avatar
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    Default Cheetah stiletto prop reconmendation

    I am looking for a recondmendation on which prop to consider for a 24' Cheetah Stiletto.
    The set up:
    24' mod vee
    800hp dynoed
    Bravo 1 with Imco sc lower.
    full imco hydrolic steering

    With a 28P bravo/bronson hill prop I hit 84 mph with 4 adults in Havasu.
    The boat seems a little flighty at speed pass with two adults. feels like the boat starts to chine walk.

    Does anyone have experience prop testing this boat? if so what has worked?

    I'm also interrested in a 5 blade maximus prop but don't know what pitch to go for. 24P, 26P or 28P

    thanks

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    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by Scapegoat View Post
    I am looking for a recondmendation on which prop to consider for a 24' Cheetah Stiletto.
    The set up:
    24' mod vee
    800hp dynoed
    Bravo 1 with Imco sc lower.
    full imco hydrolic steering

    With a 28P bravo/bronson hill prop I hit 84 mph with 4 adults in Havasu.
    The boat seems a little flighty at speed pass with two adults. feels like the boat starts to chine walk.

    Does anyone have experience prop testing this boat? if so what has worked?

    I'm also interrested in a 5 blade maximus prop but don't know what pitch to go for. 24P, 26P or 28P

    thanks
    I was hot to try a 5 blade prop. Not hot anymore. Lost 7-8 mph and run 200 rpm more. Was running a 3 blade.
    No Fool Like A Old Fool is there?

  4. #3
    Senior Member Scapegoat's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    I was hot to try a 5 blade prop. Not hot anymore. Lost 7-8 mph and run 200 rpm more. Was running a 3 blade.
    what boat and engine combo do you have? What size 3 blade? what size 5 blade?

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    Senior Member Dave Strong's Avatar
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    The Maximus props are big dia. will probably loose a bunch or rpm with same pitch. When the chinewalk happens how far trimmed up are you? If you are trimmed way up try to find bow lifting prop that will not require as much trim. 4 blade props are normaly better at keeping chine walk down, to low a X-Dimension can also cause chine walk.
    What rpm are you running, I assume 1.50 gear ratio ?

    Dave
    Last edited by Dave Strong; 07-01-2010 at 11:23 PM.

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    Senior Member Scapegoat's Avatar
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    I am trimmed up to around 6-7 on the trim gauge. I will take measurments of the x demensions when I can. Just out of curiosity. which props are for bow lift?

    the gears are 1.5's. I would love to change them but its not in the budget for now.
    Last edited by Scapegoat; 07-05-2010 at 09:36 PM.

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    Senior Member Dave Strong's Avatar
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    Merc's Mirage, Mirage plus seem good only 3 blade but seem to carry the bow well. Have not played much with some of Mercs newer props but maybe go to a dealer and see whats the latest and greatest.

    Dave

  9. #7
    Floatin dirty Lavey29's Avatar
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    Quote Originally Posted by Dave Strong View Post
    The Maximus props are big dia. will probably loose a bunch or rpm with same pitch. When the chinewalk happens how far trimmed up are you? If you are trimmed way up try to find bow lifting prop that will not require as much trim. 4 blade props are normaly better at keeping chine walk down, to low a X-Dimension can also cause chine walk.
    What rpm are you running, I assume 1.50 gear ratio ?

    Dave

    Actually, you can get the Maximus down to 15" diameter now straight from Mercury. The 4 blade is 15.25. The Maximus comes in 15, 15.25 15.50 and 15 5/8 diameters now.

    Hydromotive P5X is a nice bow lifting prop. The Maximus is a stern lifting prop unless you trim the diffuser ring off. Mercury suggests trimming 5/8 off the diffuser ring to eliminate the stern lift in the prop.

  10. #8
    Floatin dirty Lavey29's Avatar
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    Quote Originally Posted by Scapegoat View Post
    I am trimmed up to around 6-7 on the trim gauge. I will take measurments of the x demensions when I can. Just out of curiosity. which props are for bow lift?

    the gears are 1.5's. I would love to change them but its not in the budget for now.

    My opinion is that the Hydromotive P5X is a good all around bow lifting prop.

  11. #9
    Floatin dirty Lavey29's Avatar
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    Quote Originally Posted by Scapegoat View Post
    I am looking for a recondmendation on which prop to consider for a 24' Cheetah Stiletto.
    The set up:
    24' mod vee
    800hp dynoed
    Bravo 1 with Imco sc lower.
    full imco hydrolic steering

    With a 28P bravo/bronson hill prop I hit 84 mph with 4 adults in Havasu.
    The boat seems a little flighty at speed pass with two adults. feels like the boat starts to chine walk.

    Does anyone have experience prop testing this boat? if so what has worked?

    I'm also interrested in a 5 blade maximus prop but don't know what pitch to go for. 24P, 26P or 28P

    thanks

    That is a lot of HP for that size of boat. Do you have tabs? If not, adding some K planes may help stabilize the boat on the top end. They basically lengthen your overall boat and allow you to adust independently for the torque and water conditions.

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    Senior Member Scapegoat's Avatar
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    I thought about tabs also. Just wondered where the would mount as the outer sponsoon are rather small campared to a cat boat. I also considered a standoff box as well.
    transom shot.

    Thanks for the info guys.
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    Last edited by Scapegoat; 07-06-2010 at 11:33 AM.

  13. #11
    Floatin dirty Lavey29's Avatar
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    It is hard to tell from pics if there is enough room for tabs or not. Call Eddie Marine with your measurements and he will let you know. As far as props go, you will need to go down and least one or two pitch sizes going from 4 blade to 5 blade if you are going to test out some props.

    I had Bob Teague do some motor work on my last boat and for extra $150, he took my boat out to Castaic and ran it at all different speeds with different props and determined the best prop for my application. Once I got in and ran it, there was no doubt that he made the right choice for me in using a P5X on my 29 V bottom.

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    Senior Member Scapegoat's Avatar
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    cool info, thanks

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    Senior Member Dave Strong's Avatar
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    Be nice to try Merc's Bravo, Mirage, and Tempist, still think Maximus is to large dia. Have heard good things about Hydromotive but never tried them myself. Not sure tabs would help much unless the bow wants to stay high when taking off or porpose at 30-40 mph is an issue.

    Dave

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    Ultra 27 Shadow shippingguy's Avatar
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    Quote Originally Posted by Scapegoat View Post
    I thought about tabs also. Just wondered where the would mount as the outer sponsoon are rather small campared to a cat boat. I also considered a standoff box as well.
    transom shot.

    Thanks for the info guys.
    On that boat you would want to run fixed tunnel tabs. You can get them from Dana Marine. that may help you. Also like previously mentioned the Hydromotive P5X is a great prop. I have ran my best all around from bottom to top end with that prop.

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