THROUGH the enterprise of the Research and Technical Publications Section of the Ministry of Aircraft Production, to whom our thanks and acknowledgments are due, we are enabled in this issue to publish a translation from Luflwissen of a summary of investigations made in Germany on the materials used in a number of engines found in captured Allied aeroplanes. The examinations and analyses have been made by various German aero‐engine firms, suppliers of components to that industry and the D.V.L., on behalf of the Reich Air Ministry, and the results co‐ordinated by HERR KÖTZSCHKE. The engines concerned are five British—the Rolls Royce Merlin II and X, the Bristol Mercury VIII and Hercules II and the Armstrong‐Siddeley Tiger VIII—three French—the Hispano Suiza 12Y crs and Gnome‐Rhone 14 N 2/3 and 14 M 6—and two American—the Pratt & Whitney Twin Wasp SC 39 and Wright Cyclone GR 1S20 GW 2 A—ten in all.
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