Some guys (Dennis Lott being #1) really get a kick out of the wild carp you can make a Roo do becuase of the high thrust line. But if you want to calm it down, get rid of pitch down with throttle (and therefore at least #1 above in Ben's post) and make it generally fly real sweet, go here: http://www.Conceptserviceselectrical.com/Richard's%20Home%20Page/richard3.htm . This is the mod that I designed for Richard's 500 powered Roo. I gotta say that by keeping it light, it flew almost just like my old 750F powered Roos, only nicer. Truly a pleasure to fly.