Well...I'm using the T-52 Taurus...52cc...haven't flown with this yet, but I will - and yes, I'll be looking REAL hard at ATV'ing down to keep me safe. The ZDZ 40 just didn't have the "upness" I want ( my vertical criteria, some may laugh, is my "competitive" airplanes must be able to do 3 vertical snaps on a line from a horizontal pull...with pauses between the snaps...That's the way I want it)