Avon unstable at speed

[teamplonker]

I took the boat out today for a test with the engine a notch higher, What a difference it made it now feels much more stable.
Wondering if i would benefit from raising one more notch bringing cav plate slightly above keel ?

Also changed the prop from 13.5 x 15 to 13.25 x 17 the boat seemed quicker to plane, I had thought a smaller pitch prop gave quicker acceleration.

would it go even better with a 13 x 19 ?

[peterwhite]

I would definitely go another hole or two. If you do go higher a stainless prop would be a better bet and cavitation won't be a problem other than on the hardest of tight turns. Just use trim and it'll be brilliant. We have a 90 opti on our boat and we've got the hull in line with the top of the water inlet so cav plate is about 2-3 inches above the bottom of the hull. We're running a 23 pitch laser prop and no cavitation. Best way is trial and error as every boat needs a slightly different setup. Good luck though.