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Blowing out while taking off.

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Old 05-23-2011, 12:02 PM
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Default Blowing out while taking off.

While trying a new set up on boat we are blowing out pretty bad as we go to get on plane. We are running a new set of merc racing 30p heavy labbed props spinning in and the drive showers are mounted on the outside edge of the the drive. The boat is a PQ 30 Revenge with twins 425hp's and bravo drives.

Does anyone have any suggestions or thoughts?

Thanks.
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Old 05-23-2011, 12:35 PM
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Any pictures of the setup, showing drive height and setback?
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Old 05-23-2011, 12:43 PM
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IMO, if you only have twin 420s for power, you are way over propped. I might be wrong, but I would think you would need a few more horses to turn 30" wheels, labbed or not. My first boat was a 30' and it was overpropped. It blew out everytime I came on plane.

Just my .02

BTW, what prop was on the boat before you switched?

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Old 05-23-2011, 01:01 PM
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I agree with the above, that does sound like a lot of prop for the power. What gear ratio are you running?

Also, if you're using cleavers for the first time, they dont hop up on plane like a typical set of B1's will. You typically have to give them some RPM to get them to hook up.
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Old 05-23-2011, 01:11 PM
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Short boat with high drives will blow out every time. Tabs down, ease up to 3500 rpm and let it do it's thing.
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Old 05-23-2011, 01:18 PM
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It had a set of 30's on it when I got it but they were not as labbed. Original set up was 28's but at 375 hp per side, they were upgraded to factory 425hp 496's by previous owner. I was wondering if 28's might not be the way to go.

Does anyone think the drive showers could be adding to problem?
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Old 05-23-2011, 01:45 PM
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Well, I'm running 28s on my 32 Advantage Victory w twin 375 496s, and at times, I think they may be under pitched. I bought the boat with 26s and the rpms were way too high, around 5000. The 28s brought the rpms down a bit, but it still runs too high at 5800. This boat rockets out of the hole too. Never any blow out and very little slip. I would think 425s should turn 30s no problem.
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Old 05-23-2011, 11:18 PM
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I think you better stick with the original bravo 30s,boat ran great with them .my 2cents

outdrive showers are on the up rotation of prop,just as they should be.
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Old 05-23-2011, 11:28 PM
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It's pretty easy to find out if the showers are affecting planing. Take them off.

Also, there is a technique used on some of the highly tweaked boats and/or race boats that involves pushing the boat as far as you can get it up before it blows out; and then pulling back on the sticks. This will give you a large wall of water hitting the back of the boat that you can use to surf you up, as well as power through with the sticks.

Sometimes, you can rock a boat side to side and get it to come up as well, but I really hate turning the wheel more than a few degrees if you have the tabs down significantly.
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Old 05-23-2011, 11:48 PM
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What kind of rpm were you turning the old & new props?

How does the max rpm range of the old & new power compare?

If the upgraded engines turn 200-300 more rpm you might be better off running the orig size prop-28.. just a thought..

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