When running the scooter my right arm is on a plane with the handle of the scooter and that is on a plane with my chest so that the prop wash is underneath me. My left hand is not only free to be raised with a forearm dump... but my left shoulder is easier to raise with the shoulder dump.chickdiver once bubbled...
Since steering is accomplished witht he right hand, the right arm is always "up" and the shoulder/ upper bicep is the highest point.
Not only that.
But having the dump on the left forearm allows you to dump both wing and suit in the same motion while horizontal.