As a trimaran sailor, one of the few here, I think you'd be better off not mounting the motor on the transom. A transom mounted motor is going to have more problems with cavitation and not staying submerged due to the motion of the boat. I would recommend that you mount it on a sled, attached to the side of the main hull of the ama crossbeam if at all possible.
If you have questions, let me know.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.