Try this aero in your full size heli.... reverse slow rolling horizontal circles... Start flying backwards around a circle and then start rolling. First circle you do 4 rolls, then 3, 2 ,1 Note these are SLOW rolls so for the last circle the roll takes the whole circle to complete.
Can't do it myself but I saw a model Heli fly it at a show in windy weather. Astonishing to think of the co-ordination required.