Avro 558

The Avro 558 was a British single-engined ultralight biplane built by Avro at Hamble Aerodrome for the 1923 light aircraft trials for single-seaters at Lympne Aerodrome. Two were built, powered by motorcycle engines, one with a B&H twin-cylinder air-cooled engine and the second with a 500 cc Douglas engine, and the first was later modified with a 698 cc Blackburne Tomtit; both had changes to the landing gear. The aircraft did not win the competition, but the second aircraft went on to set a world record for its class of 13,850 ft over Lympne on 13 October 1923. It is not known what happened to the two aircraft, which have not been reported since 1923.