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Strange prop issue on a Scarab 22. Please shed some light.

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Strange prop issue on a Scarab 22. Please shed some light.

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Old 08-19-2019 | 06:47 PM
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[QUOTE=Scarab22guy95;4702791]Ok guys, checking back in after a day on the lake.....the boat had about 30 lbs of gear up front, two passengers and a little over half a tank of fuel.... you can slowly come up on plane from the dock, but if you try to give WOT the prop still breaks loose shooting water in the air. After getting on plane and trimming up till it smoothed out everything's fine up till about 45 mph then again if you try to push it further it will break loose and loose speed while the engine revs. Also when coming off plane this boats bow rises very high and although we've learned how to bump the throttle to stay ahead of the huge wave about to come over the stern, one time when I went to bump it it just revved and sprayed water until I let off and slowly applied the throttle again. Kinda nerve racking looking like we were gonna sink, lol... any more ideas? Thanks again all!
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Old 08-19-2019 | 06:53 PM
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Sounds like a X dimension issue, similar to what Nordic Heats have.
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Old 08-19-2019 | 07:36 PM
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trying playing with it in the driveway untill you find neutral trim, then mark or remember where that is on the indicator. once your on plane set the drie neutral and try triming with the tabs.. some little boat like that.
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Old 08-19-2019 | 07:46 PM
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You need to keep drive tucked down when planning then as soon as up on plane start trimming it out. When slowing down tuck trim back down and yes throttle up to stay out of the title wave. I had the same boat so I understand your issues. I always ran a 23p 3 blade and it ran 63 on gps was my best with low fuel and just myself in boat but was always hard to get on plane if more than 2 people in boat. I sold boat to a friend and years of him having the same troubles I suggested trying a 22p 4 blade. He loves this set up, yesterday I saw him on lake and said show me how it works and with 2 adults and 2teens it jumped out of water and still runs close to 60. Get a 22p 4 blade and it will solve a lot of your washout issues as well I promise
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Old 08-20-2019 | 08:35 AM
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Thank you guys for all the help. Its really pointing to the prop. Im going to try to borrow one.
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Old 08-20-2019 | 08:52 AM
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Four blade prop is the answer. Bravo 1 props tend to be overrated in pitch so run one number above what you'd normally run. Good luck.
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Old 09-19-2019 | 11:27 AM
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Thanks for everyone's input. It seems until I get a better prop the "workaround" is to simply get the boat on plane, trim up, then when wanting WOT I need to go easy, trim more, add throttle, trim more, add throttle and so on until I reach WOT. I did this method this weekend and achieved max speed out of the boat. Thanks again guys!
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Old 09-19-2019 | 07:05 PM
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If you go to a Bravo 4 blade prop you will need to go with a 24 not a 26.
If you are spinning a 25 pitch 3 blade Mirage you will not be able to spin a 26 Bravo. Adding the extra blade takes more HP.
You might want to try a Mirage Plus - they have more cup and that will help stop blowout.
just for giggles put a straight edge that is at least 5 foot long on the bottom of the hull in front of the prop and on each side.
hold the straight edge parallel to the keel. Look to see if there is any gap between the edge and the hull.
If there is more than 1/8 inch that is a problem and can also cause some of the problems you are having.
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Old 02-14-2021 | 11:28 PM
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Originally Posted by Tinkerer
If you go to a Bravo 4 blade prop you will need to go with a 24 not a 26.
If you are spinning a 25 pitch 3 blade Mirage you will not be able to spin a 26 Bravo. Adding the extra blade takes more HP.
You might want to try a Mirage Plus - they have more cup and that will help stop blowout.
just for giggles put a straight edge that is at least 5 foot long on the bottom of the hull in front of the prop and on each side.
hold the straight edge parallel to the keel. Look to see if there is any gap between the edge and the hull.
If there is more than 1/8 inch that is a problem and can also cause some of the problems you are having.
Well, another season went by not being able to take people out on the boat. We tried 4 people and never made it even 1/4 mile before experiencing massive prop washout resulting in having to almost come to a stop to regain grip. I have been looking for a 4 blade hydromotive prop. I purchased one that I know is too large but it was cheap enough to at least see if the prop design will help hook me up. So its a 26P 4 blade. Well then another one popped up and I got it as well. Its a more suitable size of 22P. (Again, a 4 blade Hydromotive.) I'll probably use the 26 as a spare and sell the 23P Mirage Plus as it is useless to me with the boats current configuration. Any opinions on what I might expect with the 22P Hydro? Thanks guys.

Last edited by Scarab22guy95; 02-14-2021 at 11:31 PM.
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Old 02-15-2021 | 06:59 AM
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Is there a chance that unknown to the owner this boat has a shorty lower unit on it and it hasn't been propped correctly for it ?
Also , the description of coming off plane with the nose way high and a near rooster tail sounds like what I've seen when people run way over trimmed and pull the throttle back very slowly .
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