The Magni is taxid out for run-up with the blades held by the rotor brake, I.e. free to bounce. After clearing the active after landing, the blades are again wound down and secured with the rotor brake while taxiing back to the hangar. However, I wouldn't recommend trailoring without good triangulated supports fore and att. Placement of the supports along the length of each blade is an interesting question - mid-blade? 2/3 out?