Thank you all for your input. I have been away from the world for a while and just checked the board.
"Would it be accurate to consider this situation as being an instantaneous center of rotation? I'm thinking that such an axis would start out close to the centerline of the leaf, but migrate...
When a vehicle with a conventional hotchkiss suspensionsexperiences axle wrap and resulting "S" shaping of the leaf springs, does this roation happen about the axis of the axle or the point where the leaf springs mount to the axle?
Any help would be appreciated.