The
Avro 638 Club Cadet was a modified version of the
Avro Cadet, similarly intended for both private and club use. The Club Cadet was fitted with unstaggered wings, that could be folded to help save hangar space; the staggered biplane wings of the earlier Cadet were unsuitable to be adapted for folding. The prototype flew in May 1933, powered by an
Armstrong Siddeley Genet Major radial piston engine, another 16 were built, and production finished in 1935. A single prototype of an enclosed three-seat cabin version, the
Avro 639 Cabin Cadet was built, and first flew in 1933, but did not enter production. A second three-seat version, the
Avro 640 Cadet, was produced for joy-riding work, with a widened fuselage accommodating an open cockpit for two passengers side by side in front of the pilot. Nine of these were built, the first four powered by 140 hp (104 kW)
Cirrus Hermes IV engines, and the remaining five powered by Genet Major engines. ==Operational history==