Of very poor quality, this is the only known photograph of the full-size de Chappedelaine helicopter. Note the venturi tubes fitted to the rotor tips. The very basic framework was fitted with a windshield and two side-by-side seats, although the numerous tethered take-offs and landings were performed by de Chappedelaine alone.

Jean de Chappedelaine continued his aeronautical adventures following the fatal crash of the Aerogyre with a design for a boundary layer control system for helicopter rotors, in which tip-mounted venturi tubes were used to create laminar airflow and equalise the forces acting on the advancing and retreating blades.
BELOW An illustration from patent GB576738 depicting de Chappedelaine’s boundary layer control system for helicopter rotors, which was designed to obviate the need for an articulated link between hub and rotor blades and thus simplify construction and maintenance.

Another illustration from patent GB576738 for de Chappedelaine’s helicopter design, dated January 6, 1944: "The rotors are driven by an engine (14) through shafting (16, 25), and a flywheel (23) may be provided to act as a stabiliser and also as a temporary source of power in the event of engine failure. A variable-speed gearbox or hydraulic coupling (26) may be included in the drive to the tail screws (32, 33), which may be tilted about the axis of shaft (25) by means of a concentric hollow shaft (28) rotatable by a toothed sector (37).