Excessive cavitation on 1801

[RagTop]

2007 1801 w/ F115 ---> Sorry but this boat seems to have to work too hard to get the bow up. (And it's too wet to leave it down.) I got drenched today in 3 foot following/quartering seas ..and there was no escaping it. The prop was cavitating too much for me to adequately raise the bow and I finally gave up and backed it down to 10 hp just to stop the salty onslaught.

A) I didn't realize just how wet this boat was.
B) I believe this boat should be rigged with an F150
C) The prop cavitation needs very minimal coercion....4 bars on the trim meter @ 4000rpm

I spoke with Parker regarding the mounting position of the engine and their response to my assertion that the cavitation plate was a couple of inches higher than the keel of the boat was: Purposefully mounted this way to minimize draft.

A) Do I lower the engine?
B) Are Trim-tabs the cure?
C) Is it possible that the fish-finder transducer was positioned too far aft and is now disrupting the "clean" water flow to the prop?

Anyone with similar perfomance?


Thanks

 

[mildew2]

I never take any over the bow at all. I don't think a F150 would be the answer because it weighs to much. The boat is already stern heavy. My boat is dry until I get into a side wind,w/quarter seas)then yes it is wet. But most CC's are in that situation.

 

[RagTop]

I had a side wind with quartering seas....absolutely soaked me. That's okay in August...but it ain't gonna fly in February.

I just had a really hard time pulling up the bow....and once I was trimmed out, I couldn't get any traction to push through the next wave. Maybe I had the bow up and was expecting more...I know in the past I have been able to ride a boat higher to stay dryer...this just doesn't seem to work on the 1801. I don't know that t-tabs are the answer but I'm planning on going that route, as well.

 

[pmeggers]

I got drenched on my 1801 parker, and I sometimes get drenched on my 23 parker. My 1801 had a F-115 as well. I do not remember the hole shot being a major problem (it was not a rocket ship, however), and I do not remember any cavitation problems. It has to be the mounting position of your engine. I think mine was on the 2nd rung from the buttom. Check that out...

 

[RagTop]

Agreed, Pmeggers... Doesn't make sense to mount the engine 2 inches higher to lessen the draft...the boat's gonna float the same regardless.

 

[Bryan 2530]

But it may cause the prop to cavitate less, you need to look at the position of the anti vent plate in relation to the bottom of the hull.

 

[Megabyte]

B) Are Trim-tabs the cure?

They won't cure everything, but they sure will make your life simpler by allowing you to trim with the tabs instead of with the motor.

I would suggest a set of Bennett M120's.
http://www.bennetttrimtabs.com/catalog. ... &catHome=1

 

[BradV]

what prop are you running?

 

[RagTop]

Came with black 13-19 (No hole-shot and only 5600 WOT)....just switched to black 13-17 (marginally better 5900 WOT down wind in a hurricane).

 

[BradV]

Check ur cav plate at cruise see if u need to go up or down. Also check for any thru hulls or pick ups that could be interfering with water to the motor. If everything checks out have a prop shop add cup to ur prop. It will create lift for the bow and reduce slip.

 

[RagTop]

Fish-Factory...I had following wind as well. Each time I splashed into the trough the spray would come across the beam. Believe it or not, I've got quite a few years at the helm...and if I could have trimmed up, I would have. Something's askew with the engine mount/prop or both. Trim this boat out 3/4 and make the slightest turns and you'll hear the roar of the prop. It would follow logic that if the engine was mounted too high
1) It would adversely affect hole shot
2) It would more readily cavitate in turns
3) It wouldn't push the bow up because there wasn't enough engine in the water to begin with.
(Did I just answer my own question?)

Then again...

Brad... There is a rather hefty transducer a bit more astern than I would have mounted it.