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Jet Pumps / 96 Lavey Craft 21Xt porpoising problem
« on: October 20, 2017, 09:45:01 AM »
Hey there everyone, been scoping around for a while but this is my first post.  I wanted to get some feedback from some great minds here.

My history with Jets ?  My Brother and I have owned a '69 tahiti 18' with 455 olds/berkeley combo for 13 years.  it was our first boat.  3 years ago i upgraded and bought my 96 Lavey Craft 21 XT Ski with a 454 (330hp) and Dominator pump.

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Our Tahiti ran on rails with the place diverter, the Lavey, not so much.  Porpoises all the time, at all speeds.  The only real way to stop it is to toss two kids up front and trim all the way down.  not the best for cruising efficiency haha.

About the boat:

transom to nose 21', total overall length with built in swim step 22' 8".  #/- 3300 lbs .  Dominator insert pump and the hull had a delta pad that best i can measure with angle finder is 3* up from keel.

When i bought it, the ride plate (Cav plate? )  its small like 8" x 12", was set 3* down from delta (0* from keel)  i adjusted up 3* so that it was inline with delta pad and no change in porpoising.   This is very annoying as i cant cruise faster than 3800 or even trimming all the way down doesnt work any more and i cant ever throw a roost as i look like a bucking bronco fool on the water  :mad:

What are your thoughts?

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