He came up with the idea for a new form of audio loudspeaker, one that would greatly reduce distortion by replacing the nonlinear mechanical spring with a linear air cushion.
Air cushion technology has vastly increased the landing capability of the craft, providing greater speed and flexibility over traditional landing craft.
Thanks to air cushion properties (the ability to lower the air pressure trolley on the right) moves to the trolley stop is able to fall to the pavement level.
There also exist pucks that use a battery and fan to generate their own air cushion, but as they are prone to breakage, they are commonly marketed only as toys.