A compound helicopter with braced wings in joined-wing configuration, a fuselage that extends from a front fuselage section to a rear fuselage section, and an emergency floatation system with main floatation balloons and lateral floatation wherein balloons, the main floatation balloons comprise at least one front floatation balloon that is arranged in the front fuselage section and at least one rear floatation balloon that is arranged in the rear fuselage section, and wherein the lateral floatation balloons comprise at least one first lateral floatation balloon that is arranged close to an interconnection region of the first braced wing and at least one second lateral floatation balloon that is arranged close to an interconnection region of the second braced wing.