Support, steering and propulsion device for air cushion vehicles

A support, steering and propulsion device (1) for air cushion vehicles commonly known as hovercrafts (2), comprising a propulsion fan (3); at least one, but preferably two flow deviators (6, 6a) generally of cylindrical sector shape are provided which, independently of each other and under the control of the vehicle driver, can intercept and deviate in a desired direction all or part of the air flow generated by said fan (3).