I have had 3 LT-40's with anything from a .40-.46, bottom of the food chain engines, worn out, etc. I've added pounds glue, smashed them into pavement, rebuild with Gorilla glue and steel beams. LT-40's will fly regardless of how heavy and how ugly. It's the wing. It's big and lifty and very mauverable. I mostly fly minimal power flight, on the edge of stalling and 3 feet from the ground. That means 1/8 throttle and elevator at a 45 degree angle. They are wonderful, late afternoon, sit back in an easy chair, beer in hand, flying machine. Enjoy the weight. Don't worry, just balance and fly.