THERE are three engines in the Bristol range of radial air‐cooled sleeve‐valve type.
(1937), "Bristol Sleeve‐Valve Engines: Details of the Aquila, Perseus and Hercules Types with Performance Figures", Aircraft Engineering and Aerospace Technology, Vol. 9 No. 8, pp. 218-222. https://doi.org/10.1108/eb030212Download as .RIS
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