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MEGASLAM

New prop?

10 posts in this topic

Hi,

Curious of your thoughts.

I have a 19.2 Tournament series Crestliner with a 200 4-stroke Yamaha. I’m not sure if its "planeing" out correctly. I cannot see any markings on the aluminum prop but I estimate it to be about 14” and is stamped with 21M (pitch?).

When I’m at wot, ~5200 RPM, I’m moving in the mid-40s (seems slow based on the hp). So I have some room to experiment.

Here’s the concern, when I’m traveling in moderate chop I need to have the trim all the way in to avoid heavy porposing(sp?). When I have some weight in the front it is a lot better and can trim out a little bit more but still is bouncy in waves. Even with it trimmed all the way in calm waters I’m definitely not plowing.

So it seems to me something needs to be adjusted. Can a different prop affect the angle enough? It seems silly but should I put weight into the bow? Right now I’m leaning towards Smart Tabs but would rather correct the source of the issue.

All comments are appreciated!!!!

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you have the wrong prop on it. What you are going to have to do, is call the dealer that you got the boat from, or any Yamaha dealer that is closes to you, tell them what motor you have, and get the right prop for it. You sould not be porposing at wide open

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Sounds like a 19 pitch prop might be required, which should help get your RPM's up and better hole shot / planing. You will loose some speed though, and I'm a bit surprised it's not a bit faster.

What hole is the motor mounted in?

marine_man

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Hello marine_man,

There are four holes to choose from and it is currently mounted in the second from the top. Sorry for the novice questions but what affect will lowering or raising the motor have on speed, plane, handling etc....?

I too was surprised by the top end but wrote it off to an inferior/incorrect prop. Any other Crestliner Tournament owners out there willing to share their figures?

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Is the speed 'mid 40's ' on GPS or speedo , those speedos are sometimes really off . Seems to me with that set-up you should be in the low 50's range . Personally I would shift the weight around a bit and experiment .

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I bought it used from a good friend who knows less about boats then me. blush

He also gave me a stainless prop and told me to change it out but I haven't had a chance to do it.

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Hi BudMan,

It was on the speedo. I'll check it on the GPS next time too.

I agree with shifting the weight around too. To create a huge front platform, the console is really far back (imo). Their are two batteries mid ship and a trolling motor at the bow but the storage compartments are pretty empty so far. I'm trying to get the heavier items into the front floor storage but cannot think of anything more significant than the anchor. It made a huge difference to the bouncing when I weighted it down with our luggage, food and cooler to go across to an island but this is not the typical configuration for fishing. I would hate to add weight to add weight but maybe its necessary in the hull area?

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If you are new at this , let me try and explain why a boat will porpoise . The boat performs best when the motor is vertical to the plane of the water , when you trim it out , the motor will 'lift' the front of the boat and if it can't hold it up it falls back down ,then it lifts it back up again and falls again .Some props with double cupping will 'hold' the water better and help eliminate the bouncing . Remember this though , most boats will porpoise if trimmed all the way up . Only the lighter front 'hot rod boats' can be held up in front . If you move weight to the rear that will help keep the front up , when you add weight to the front , the motor can't pick lift the front up so it won't porpoise . Does this all make sense ?? We used to do a little racing a few years back and that is how I acquired all this vast knowledge LOL .So after all this ranting on you might want to try that SS prop you have with your boat , it just might be cupped enough to solve your problems .

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There are four holes to choose from and it is currently mounted in the second from the top. Sorry for the novice questions but what affect will lowering or raising the motor have on speed, plane, handling etc....?

Raising the motor will help top end speed and get your a few more rpm's - mostly because you're running less motor in the water - less drag, etc.

I would try it with the stainless prop & see what speed you're running at WOT, trimmed out and just down until it stops porposing.

With that much HP a stainless prop should make a noticeable improvement in performance.

marine_man

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