THE Siemens SH.20, which can be supplied with or without reduction gear, has a total swept volume of 31·5 litres and a power output of 500–560 h.p., and is one of the largest and most powerful air‐cooled engines in the world.
Beck, W.C. (1930), "The Siemens‐Halske S.H.20 Engine: General Description with Power and Consumption Curves Including Report of Official Type Tests", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 7, pp. 171-183. https://doi.org/10.1108/eb029288
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