THE Cirrus‐Hermes Engineering Company's products derive a special interest from the fact that they were the first to be produced to meet the demand for the light type of aeroplane, and from 1924 to the present time the firm has concentrated entirely on the production of a 4‐cylinder air‐cooled engine which differs only in size and in detail improvements from the first model.
Handasyde, G.H. (1931), "Building Light Aeroplane Engines: The Design and Manufacturing Processes of the Cirrus‐Hermes Engines Examined and Described", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 9, pp. 217-219. https://doi.org/10.1108/eb029445
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