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Discussion Starter #1
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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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.
 

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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:)
 

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Discussion Starter #5 (Edited)
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.
 

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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:)hand
 

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Floatin dirty
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4,831 Posts
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.
 

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Floatin dirty
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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.

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

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Floatin dirty
Joined
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4,831 Posts
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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Floatin dirty
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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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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
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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.
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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Discussion Starter #15
Just out of curiosity, what is the reason for tabs in different locations
What is the purpase of fixed tabs over the tunnel. Would adjustable be preferred and whyor why not.
how about on the outer sponsoon. Why are some boats mounted at an angle and other mounted straight. Has anyone with a Cheetah mounted tabs.

thanks
 

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Ultra 27 Shadow
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Just out of curiosity, what is the reason for tabs in different locations
What is the purpase of fixed tabs over the tunnel. Would adjustable be preferred and whyor why not.
how about on the outer sponsoon. Why are some boats mounted at an angle and other mounted straight. Has anyone with a Cheetah mounted tabs.

thanks

The fixed tunnel tabs work opposite of the trim tabs. Tunnel tabs when adjusted downward trap the air and help create bow lift and will eliminate porpoise. The trim tabs when adjusted down will bury the bow. On your boat I would not run trim tabs. If anything I would run Dana Tunnel Tabs. I ran them on my last Ultra 27 Shadow before the new bottom design and they are worked awesome! I may add them this winter to my current one as well.
 

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Floatin dirty
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Tabs can also help with planing time and allow you to stay on plane at slower speeds if you intend to wake board or tube behind your boat as well. They give you added control in varying water conditions and basically extend the running surface of your bottom to help with control at top end.
 

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Discussion Starter #18
Outer sponsoons are roughly 13" across. tunnels are around 15" . I might go with fixed tabs over the tunnel. A friend has a 26p revolution prop that I gonna try out eventually. Gonna have to talk to a prop shop to see about multi testing props for a day.:D
any one have a preferred shop that does this in cali/havasu.

Thanks
 

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Might try a Chad Hill prop. I have a 23' Scorpion which is the same bottom. Fastest prop ever was a Mazco RE4 but they are so thin they don't last long also small diameter so plenty of slip when cruising. Have a 16.25 x 24 cleaver for skiing and up to 94 mph. Run a 16 x 29 Arneson worked by DAH props for speed. Have a Harring 16 x 27 radiused eared cleaver but doesn't work so well. Round ears with plenty of rake handle the best at speed. Prop centerline on mine runs 4" below center pod.
 
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