A lawnmower, typically a hover mower, comprising: a housing (1) open on a bottom surface (2) thereof and defining a cutting chamber (3) and a lift chamber (4) on the bottom surface; a cutting element (6) in the cutting chamber; and a lift-generating member (8) in the lift chamber (4), in which the cutting element (6) and the lift- generating member (8) are mounted for rotation about generally vertical axes (7, 9) which are generally perpendicular to the bottom surface (2).