Another Oday w/outboard
I have a '79 O'Day 28. The saildrive was pulled by a prior owner who installed an outboard hydraulic assist bracket rated for 15hp. It holds a 9.9hp Mariner that weights 86lb. I've had it on and off several times. This transom doesn't flex at all. This mount is backed by a couple circular plywood plates that are very thick. I've never measured them but it wouldn't surprise me if they we 3/4." The transom is also a reverse angle. Flexing would bother me. Good luck.
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'79 O'Day 28