The Humming Bird light helicopter was designed by Major-General C.J. Chu in China during 1945. His Model A Humming Bird was a tiny coaxial helicopter with an enclosed fuselage pod and a 125hp Kinner engine, which was destroyed in ground testing. The subsequent Humming Bird B was similar, but it is not clear whether either helicopter flew - and the Humming Bird B was abandoned in China when Chu fled to Formosa. In 1952, he produced a small tandem-rotor helicopter known as the CJC-3 which was a side-by-side two-seater with a centrally-mounted 190hp Lycoming engine and fixed four-leg undercarriage. No further information is available.
R.Simpson "Airlife's Helicopter and Rotorcraft", 1998
Technical data for CJC-3
Number of seats: 2, engine: 1 x Lycoming rated 190hp, rotor diameter: 6.47m, gross weight: 930kg, empty weight: 680kg, maximum speed: 180km/h, cruising speed: 136km/h, inclining climb: 466m/min, ceiling: 3660m, range: 216km