I would think that the retreating blade only stalls on the very edges and then quickly recovers from the stall as it moves towards the 6 oclock position. So that would mean that it would dip down momentarily at the 9 oclock position. this would then move the rear of the disk downward and result in the front climbing. The roll would just be caused by the increased drag on the left side of the system right?
[ 05 December 2001: Message edited by: baranfin ]