www.iFourWinns.com

I recently bought a 2005 Horizon 200 with a dinged 19 pitch prop I had the dealer replace b4 purchase. I took it out on it's maiden voyage and it cavitated around a quarter of the way up trim. I took back to the dealer and they put a 21 on it. Took it out again and cavitated maybe a little less but still seems unacceptable. I'm thinking maybe a prop with more "cup" might solve this. Any thoughts appreciated.

Hmmm... no problem with mine - running the stock 14.25" x 23 Al prop

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Alec

2006 Horizon 190
VP 4.3GL/SX, Sunsport

just a few questions
1) Is it cavitating only during corners only? If so as a general rule I trim all the way down for corners as this can sometimes cause cavitation in some instances if not trimmed in.
2) Is there anything that is dragging in the water which may cause the prop to ventilate,ie speedo wheel ,transducer etc
3) is there any damage to the skeg or cavitation plate?

I currently run a 19 inch stainless steel vengence prop that does have cupping on it with no problems

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Ardy
Adelaide South Australia
Red H180 3.0 Merc

it actually does it going straight. Theres nothing dragging. Skeg is fine, I'll have to take a closer look at the cavitation plate which I don't know much about. I should have paid closer attention to the original prop they replaced. I'm not 100% sure the new prop they put on is same as the original.

MMMMMMMMMMM Going straight eh, me thinks it might be either of two things
1) Totally wrong prop, as it is sucking in air somehow ,or
2) Your outdrive isn't going all the way down. Signs that this might be happening are excessive bow rise on acceleration and cavitation. You can check this by running the outdrive to the down position (on the trailer) and see if it is going all the way down. The cav plate should follow the line of the bottom of the hull
hope this helps

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Ardy
Adelaide South Australia
Red H180 3.0 Merc

4 Blade prop would help reduce cavitation in turns. I plan on getting one from hillmarine.com
My brother has one of there's on his boat & has been very happy with. Prop should not be cavitating when going straight - i'd go back to the dealer.

How badly was the original prop ding'd? Was it an SS prop? I'm thinking you might want to have someone inspect the prop shaft. It may be bent and causing the vibration that may seem like cavitation. Just a thought.

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2008 H210SS VP 5.7 Gi/SX
2011 Ford F150 FX4 EB

It wasn't too bad....I had some on the old SeaRay looking like a wadded up beer can. It was not stainless, was aluminum. I don't think it was damaged bad enough to bend the shaft. I took it to the local prop shop today and had them put more "cup" in it. I'm gonna try to get out tomorrow for a test.

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2005 Horizon 200

yep, still cavitates

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2005 Horizon 200

Are we talking porpoising or full-blown cavitation? If porpoising, a small trim adjustment (trim down) would take care of it-especially if you are relying solely on the marks on your trim gauge as the guide to where you should trim your outdrive. Trim level is a matter of feel and is something you just learn as you operate your boat. The weight of your cargo has an effect on it, too, as well as where you place them in the boat.

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Paul
2007 Four Winns Horizon 220
Mercruiser 350 Mag MPI w/ Bravo III Drive
2004 Ford Explorer Limited (V8-AWD)
Pomme de Terre Lake (Southwest Missouri)

It's cavitation. I would think you should be able to trim up more than 25% on any boat.

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2005 Horizon 200

25%? My boat would go vertical if I trimmed it that far up.

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Mike
2005 Four Winns 230/240
VP 5.7GXi/DP
1998 F-150 XLT
Boat Pic

As well as your U/Js self destructing! Isn't the maximum recommended angle for the SX something like +12 degrees when running and +5 degrees for the DPS?

Don't trust the trim gauge, they are notoriously unreliable after a couple of years. Ensure the drive is fully down by listening to the note of the trim pump.

Graham

What rpm are you able to reach at wide open throttle? Speed?

Readout of gauge could be out of wack?

The Four Winns "stable vee" hull doesn't like much up trim. However you should experience porposing long before you have any "cavitation" (which is really ventilation -- but I won't go there, since cavitation has become an accepted term for what you are experiencing) ==

If you have what seems like caviations at fairly normal trim angles -- are you getting slippage at the prop hub -- not very likely on multiple props -- but stranger things have happened ---

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DaleG -- West Palm Beach FL
2003 240Horizon -- 5.7Gi -Duoprop