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Prop slip around 30%, very hard to get on plane

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Prop slip around 30%, very hard to get on plane

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Old 08-08-2024, 10:31 PM
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Just noticed something in your last pics. Does the starboard prop have some damage to the blades? If so this could be a piece of the issue.
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Old 08-08-2024, 10:56 PM
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Mercruiser spends a lot of time researching ways for parts to fail. They have to, otherwise they wouldn't be so good at it.
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Old 08-08-2024, 11:07 PM
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For some reason it's too much out of those props and they are sucking air from above. Walking the throttle slowly allows the water to continue to be "feeding" the prop as the boat moves faster. I'd be very surprised if you put a 5 blade on if you had any issue getting on plane. Not a 26 pitch, probably a 24. If this is a problem that has been "slowly" getting worse you might have water intrusion somewhere. We have cut a lot of boats apart and sometimes find vast amounts of soaking wet foam and even standing water in sealed compartments. My old Sonic ran 68 @ 5000 with 26 Bravo ones. Labbed props do not plane out as well in all my experiences.
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Old 08-08-2024, 11:16 PM
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Originally Posted by bencini231
Just noticed something in your last pics. Does the starboard prop have some damage to the blades? If so this could be a piece of the issue.
Bencini,

OP hasn’t posted any pics of his props yet. He’s mentioned he is using brand new props, though.

Thanks. Brad.
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Old 08-09-2024, 06:00 AM
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Originally Posted by im MartinB
Mercruiser spends a lot of time researching ways for parts to fail. They have to, otherwise they wouldn't be so good at it.
XR upper gear gears and merc spec 525-700 CMI headers come to mind

Those 2 items have to be their biggest failures in the r &d
department

They made many a owners wallets lighter

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im MartinB (08-09-2024)
Old 08-15-2024, 07:09 AM
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Originally Posted by baja 33outlaw
did a sea trial, the seller drove. He slowly eased it up on plane, I don't remember if the props were blowing out slightly on him. I imagine they were, I just wasn't aware of that going on. Until I've had it in lake erie for a few weeks I can slowly get it on plane, while doing so the props are blowing out. Once it's bottom is too dirty, no matter what I do it won't plane.

I don't notice any vibrations, and the props don't wobble when I've spin them while on the trailer.
Baja33Outlaw,

Any update on this? Pics? Genuinely curious....

Thanks. Brad.
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Old 08-16-2024, 03:27 PM
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Originally Posted by Brad Christy
Baja33Outlaw,

Any update on this? Pics? Genuinely curious....

Thanks. Brad.
no, sorry. Haven't had any time to get out there since I've posted all this. Didn't want too make this thread too much longer replying until I can get some pictures. Appreciate everyone for all the advice on this so far, I'll get back soon.
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Old 08-17-2024, 10:46 PM
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So finally got some pictures, a bit useless since everything is covered. Also shows how bad of a boat owner I am, lol. Went and pulled the boat out just now by myself, in the dark. I was planning on sitting on the swim platform to watch what the props do when we take off while someone drove, but plans for them fell through. It's late and have to tow it home now, so don't have time to clean off and check everything tonight. I'll be doing quite a bit of power washing soon. about the only thing that's clear right now is that the drive shower is installed correctly, right?

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Old 08-18-2024, 06:20 AM
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Wow that’s a lot of growth on there, what does the rest of the boat look like? The good news is you found your problem.
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Old 08-18-2024, 06:24 AM
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How long has it sat in the water?
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