Originally Posted by pluto2
The engine is Merc 90 four stroke spinning a 13x21 prop. When powered up to 30 knots and over, it gets a bit unnerving coming off a wave and down on to your port tube. The hull is in good shape, cant see anything odd about it, just wondering why this is happening, anyone else experience it I wonder ?
Its an offset issue ... you dont have enough of it
The worst hull that did it for me was an 8.5,.. and 40 gallons of contained water inboard and on the starboard side would'nt cure it
If its as bad as you say with only a 90
.. it would suggest little or no offset at all.. can you measure the position of your engine on your transom ie how much off centre it is, and report back ?