Definition of waiver. 1  1 : the act of intentionally relinquishing or abandoning a known right, claim, or privilege; also : the legal instrument evidencing such an act.
Roll, pitch and yaw. Roll, pitch and yaw are rotations along the natural axes of the helicopter (or any aircraft). A rolling movement is where the helicopter rotates along a line along its length using lateral cyclic inputs (aileron), eventually turning from right way up to inverted while maintaining the helicopter's heading.
Find all helicopter sounds. engine helicopter movement. thump. 1. to strike or beat with or as if with something thick or heavy so as to cause a dull sound, as in a punch during a fight, or the sound of heavy footsteps 2. a verb for sound made by a big engine, as in thumping, chunking engines going..