Saw Patty Wagstaff do one at the Dayton Airshow this past summer, darn near as good as Frank Knoll can with his 33% Carden , I was totally impressed !! Throttle management, elevator and rudder inputs are the key to hanging one. The easiest way is to enter it from level flight, point the nose up, back off the throttle and then use the elevator and rudder to keep it pointing up. Also use the throttle to keep airflow over the control surfaces. I found a CAP 232 3D plane on the realflight site that 3d's pretty well also the ltimate bipe there also.