Hi
I have Mariner 40 hp 4 cylinder to mount on a bristol skiff(dory..flat bottom)
like this one
http://www.youtube.com/watch?v=rK-rXVAVWvU&feature=mfu_in_order&list=UL
On installing the motor, I saw the cavitation plate is about 2" below the flat bottom.
The bottom does have a center skeg...