I've been flying a Giant Stinger with a G-62 on it for a season now. Weight is 19 lb. Started out with the Zinger 22 x 6-10 prop and went to the Mejzlik 22 x 10 and never looked back. Much better vertical. I'm swinging the Mejzlik at 7700 with a B&B muffler, velocity stack, and no spring starter. My engine weight is 5 lb. 1 oz. firwall ready, no prop or spinner. In my opion, 19 lbs is about max for this engine. I can hover on a 90 degree + day and gently pull out of the hover. It shoots out pretty good when it's 60 out. I've got close to 90 hours on this plane now and never a dead stick. That's what's nice about the Zenoah's.