ORIGINAL: knucklebutt
Dicks got the right idea here:
I have been flying mine for some time now with the recommended 160 four stroke twin. Never had any issues. Full throttle for take off (gently on that throttle and be ready for that right rudder) after take off about 2/3 throttle for scale flight. Mines 20.5 lbs, no lead but all batteries are right against the firewall. I do not land this power off but just a click of throttle with full flaps.
Denis
Denis, good to hear yours flies well on the Gemini. Mine did too, once it got up on the step, so to say. Take-off was it's downfall. No reserve power, and if it bounced into air because of springy gear and bumpy strip, it couldn't power out. Happened on a warm August day, and tip stalled on take-off, resulting in a new set of wings, and conversion to electric. Mine came out at just short of 25 lbs, with everything against the firewall, and two full pounds of lead bolted to the firewall. After the change to electric, I still have 8oz on the motor mount, right behind the motor, but it weighs only 21 lbs now. Vertical power from about 25 ft after wheels up on take-off. Take off at 3/4 throttle. Radared at 95 mph flat and level, no wind. At full throttle, the motor "growls" sounding like a very powerfull radial. Turning a 20x8 prop. The Gemini would only fly on an APC 17x8.
I do love this plane.