I wish I knew what I did with the mirage drive plug that came with my old AI, but until now I never had a use for it and, while I can't imagine throwing it out, I haven't been able to find it. I tried making one with some art putty material crammed into the well and allowed to harden, but it didn't work out.
As for the boat sinking if there's a hole in the bottom, I think motors through the bottoms of boats has been done in the past. I'm no engineer but I think that the trick is that the motor has to be situated in a well that is raised up from the bottom of the boat, then the motor shaft extends below. The question is whether the shaft of the hobie/torqeedo is long enough that the well can be built up high enough to be above the water line (even with the boat loaded), but I don't think it has to be very high in this case.
I've had unsatisfactory experiences mounting motors to the transoms of small sail boats. I've ended up with too much weight in the rear of the boat unless you add ballast to the bow, so I like that the motor can be in the boat's center. The AI, being so low and flat and mostly unsinkable, doesn't have much of an issue with this. Nevertheless, the motor in the middle works out well for it too.
Tim
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