i recently purchased an older 20' smokercraft 20' flat bottom boat with a 78 mercury 115hp prop and just bought a jet unit for it. havent got it installed yet but i am in the planning stage right now. I have the equipment to weld aluminum and have welded alot of steel just need to learn aluminum before getting started. my plan so far is to fill the boat and any rivets or joints that leak i plan on welding them up hopefully to eventually end up with a fully welded boat.
as for the transom i am reinforcing it and going to set the hieght required to get the jet foot in the right place but i am debating between just haveing the foot below the boat or building a tunnel. i have heard both ways on putting a tunnel on a flat bottom boat, some say it works great and some say it gets too much airiation and cavitates badly. what are your ideas?
any help would be greatly appreciated.