A deicer 100 for attachment to a substructure 102, the deicer 100 comprising skin heating means 101 immediately subjacent an outer skin 104 overlying an apex of a leading edge, and a skin deflection means 103 immediately subjacent the outer skin 104 chordwise aft of the apex. The skin heating means 101 prevents the formation of ice 118 over the apex and the skin deflection means 103 deflects the outer skin 104 to expulse ice 118 formed chordwise aft of the apex. A controller 234 is provided to control the heating and deflection cycles to minimise power consumption of the deicer.