I originally planned on a ZDZ-80 (single). After getting the kit, I decided that I would have too much of the cylinder sticking out of the cowl. This thing is too nice to chop it up for the motor. The ZDZ-80 would also have required a lot of weight to balance. I finally selected the GT-80. It bolts on, uses the stock mufflers (really quiet) required nothing but cooling holes on the bottom of the cowl (fits totally in the cowl) and 20oz of weight to balance the model. Hovered at 3/4 throttle on the test flight. Plenty of power.

Tom Perry