Re: twin 115 fichts on a 20 MA
I agree with Big. Go with a good single engine, 140 to 200, and then add a kicker in the 6-10 hp range. Then become a member of SeaTow. The kicker will get you back to where SeaTow will bring you home.
I think the heaviest twins I would even remotely consider on the back of a 20' CC with a bracket would be twin 90's, and then only if they were very lightweight 2 strokes such as older Yamahas which weighed about 270 lbs, or newer Tohatsu/Nissans, which weigh about 280 lbs. Even then that's a lot of weight.
I have rigged twin Evinrude 70's on a Seafari, back in the mid 80's, and they were okay, but you could feel the weight, and the performance was mediocre at best, while fuel consumption was gluttonous. But I have to admit, it did plane off on a single motor, even with the other motor trimmed down.
You really don't need all that power. It's just an ego thing. (But I like it, too.)
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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