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Developing 60 horsepower (45 kW) in normal flight it became the first Cirrus engine, and the first air-cooled four-cylinder inline aero engine, to go into quantity production. The Cirrus was launched onto the market in the de Havilland Cirrus Moth, first in a long line of Moths, in 1925. The engine proved to be ideal for private light aircraft ...
It became the first Cirrus engine, and the first air-cooled four-cylinder inline aero engine to go into quantity production. The original Cirrus engines were all designed by Halford and built by ADC. The 65 horsepower (48 kW) Cirrus I passed its 50-hour type rating in 1925.
The Blackburn Cirrus Major started life as a clean-sheet replacement for the original 1920s Cirrus and Hermes series of upright inline four-cylinder air cooled aircraft engines originally designed by Frank Halford for the early DH60 de Havilland Cirrus Moth and which had been in production by the Aircraft Disposal Company (ADC) and later Cirrus Aero Engine Limited, which itself evolved into ...
(later described as a Cirrus Mk I Engine). 8 pre-production and 31 production aircraft built. DH.60X Cirrus II Moth (initially known as the Moth Type X or Experimental Moth) Introduced in 1927 this variant had a slightly larger wingspan by 1 foot, increased length by 2.5 inches and decreased distance between the upper and lower wings. Powered ...
The first aircraft built (registration G-EBQU) first flew from Stag Lane Aerodrome on 24 June 1927 and was fitted with an 85 hp (63 kW) ADC Cirrus II engine to check its handling characteristics. This was then replaced with Major Halford's prototype engine, by then named the Gipsy. [1]
The Cirrus Minor started life as a clean-sheet replacement for the original Cirrus and Hermes series of light aircraft engines. Design was led by Technical Director C. S. Napier, son of Montague Napier, and was already under way when in 1934 Cirrus-Hermes Engineering was taken over by the Blackburn Aeroplane & Motor Company and moved to Brough in Yorkshire.
Yakovlev designed his first aircraft while working at the Zhukovsky Military Aviation Academy; the aircraft was a two-seat light biplane powered by a 60 hp (45 kW) ADC Cirrus piston engine. [1] Although the directors of the academy were opposed to the design, the aircraft was built in the Academy Club on his own time. [2]
Blackburn acquired the Cirrus-Hermes Engineering company in 1934, beginning its manufacture of aircraft engines. However an updated range of engines was under development and Blackburn wanted to wait until it was established before giving its name to them, so Cirrus Hermes Engineering was retained as a separate company for the time being.