Just a first and only suggestion and not sure if this is the right place for it. There is a thread in the airplane beginners forum concerning Challenger Motor Modifications. It's fairly current, with a post or two within the last few days at the end of it. Being a Challenger advocate, I think more Challenger owners would see it and gain ideas from it if it was moved to the park/backyard electric fliers forum. Thanks, and I won't bother you again...today. :')