I think cap. Bob has it just right. My 150 Yamaha pulls my transom down a little more then my 175 Johnson did. But my over all water line didn’t change much. So I had planned to mount my bracket, when I build it, just where Capt. Bob did. My water line is just about the same as his.
Fish sorry for taking so long getting back. Had a little problem called sandy. My water line was at 4 !/2” measuring from the chime were the side meets the transom. It is now 6”. The reason being, the motor change. The weight of my 175 Johnson was 393 Lbs. the new 150 Yamaha is 468 lbs. Why I say the average water line did not change, because the bow has a little more rise to it. In my opinion, these boats are a little sensitive to weight on the transom. I never had water come in the rear drains till I changed motors. Now when sitting in the water and only me at the transom, water comes in the drains and flows over the deck to were the beginning of the front edge of the splash well. So that is why I would mount it were Capt. Bob mounted his. That weight will pull your transom down.
As a reference, the 96 Evinrude weight 450+ lbs. and was mounted 26" off the factory transom using the bracket/platform. The bracket was advertised as having floatation (air trapped in motor mount). I also had a 17 gal. bait well mounted on the platform on the starboard side. That added about 100+ lbs. when in use. I used the platform to fish off of and that (at the time) added another 180 lbs. so.......Last I heard, boat hasn't sank.I kept expandable plugs in my drains (cockpit) and they worked fine at keeping my feet dry. Just a thought.
I was thinking of those ping pong scuppers from keeping water from coming in and letting it out when you are on your way? Do they work or are they just a pipe dream? <!-- s:mrgreen: --><!-- s:mrgreen: -->
I also went back an looked at keths redo of his 222ccp open transom (reef or madness). His bracket is also mounted even with the top of his transom.