Separate radial cooling ribs b are arranged so that their sides form between them a number of helical guiding channels for the cooling air. The ribs taper outwards and the section of each is a rhombus.
(1934), "Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently", Aircraft Engineering and Aerospace Technology, Vol. 6 No. 12, pp. 338-338. https://doi.org/10.1108/eb029887
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