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. :')

For the best results if you or others see this in the future, click the "REPORT" link within the post and a moderator of that forum will receive the message and help. I'm inclined to leave it in the beginners forum as the member starting the thread is indeed seeking advice as a beginner.