Duckbill
Member
I've got a new (to me) 12' semi v alum jon boat with a 1990 Mariner 8HP long shaft on it. I just put a new 9" pitch prop on it. I know the long shaft will slow it down some, but this thing will only do 12-13 mph and won't get on plane unless I put everything in the front. Does that sound right? I used to have a 9.9 Merc on my 12' flat bottom and it was a rocket ship.