I have watched a lot of park flyer fly at our field and not oneflown off or crash with knockoff receiver in them we have two pilots that have flown for over 50 years and they use knockoff receiver in there plane .So if they can do it why shouldn't I. No disrespect to you gays you are giving good information but I'm on a vary low budget and i got to do what i can do to keep flying . Thanks to everyone.