Vittorio Isacco designed and built four different Helicogyre experimental helicopters between 1926 and 1935. In 1928 Air Ministry Specification 2/28 was issued to S.E Saunders for a prototype helicopter to the Helicogyre No. 3 design.
The Helicogyre had a conventional 1920s tractor aircraft fuselage and main landing gear but had an extended tailskid to keep the fuselage horizontal. At the front of the fuselage was a 100 hp (75 kW) Armstrong Siddeley Genet piston engine. Behind the cockpit was a braced post on which was fitted a four-bladed rotor, each rotor blade was fitted with a 32 hp (24 kW) Cherub piston engine at the tip.
The Helicogyre serial number K1171 was completed in 1929 and delivered to the Royal Aircraft Establishment by road. Ground tests were not completed and the programme was cancelled on 30 December 1931 without the Helicogyre having flown.