The Halton Mayfly was a British two-seat biplane designed by C.H. Latimer-Needham and built by the Halton Aero Club between 1926 and 1927.
Registered G-EBOO and named the HAC.1 Mayfly it first flew on 31 January 1927.
It was converted to a single-seater and was flown in a number of air races including the King’s Cup Race. It was entered in the 1926 Lympne light aircraft trials as No. 8 but failed to arrive in time for the elimination trials.
By 1928 the aircraft had been converted from a biplane to a parasol monoplane and was renamed the Halton HAC.2 Minus. The lower wings were donated to the Clark Cheetah G-AAJK.
Powerplant: 1 × Bristol Cherub III, 32 hp (24 kW)
Upper wingspan: 28 ft 6 in (8.69 m)
Lower wingspan: 22 ft 0 in (6.71 m)
Wing area: 195 sq ft (18.1 m2)
Length: 22 ft 0 in (6.71 m)
Empty weight: 480 lb (218 kg)
Gross weight: 920 lb (417 kg)
Maximum speed: 83.5 mph (134.4 km/h, 72.6 kn)
Cruise speed: 75 mph (121 km/h, 65 kn)
Crew: one / two
All Aero 