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Aviation History
1937
1937 - 1521.PDF
JUNE IO, 1937. FLIGHT. 577 STYLES from the STATES The impressive machines in the upper photo graph are three of the thirteen Boeing YB-17 bombers ordered by the U.S. Army Air Corps. The left-hand and lower views show the experimental XB-15 Boeing (four Twin-Wasps) ,which is even larger,but which, according to the latest information, has not been flown. The fighter above is the Seversky P-35 with Twin Wasp engine, which does well over 300 m.p.h. and is the fastest American pursuit machine. OF the thirteen Boeing YB-17 bombers (four 850 h.p. Wright Cyclone G. engines) ordered by the U.S. Army Air Corps six have been delivered and, as will be gathered from the top photograph, are regarded as tactical equipment and not merely as of an experimental character. The XB-15 Boeing is of similar conception to the YB-17 but is considerably larger and is fitted with four Pratt and Whitney Twin-Wasp 14-cylinder two-row radials in place of the Cyclones. A four-wheeled retractable undercarriage is fitted and the machine carries two auxiliary petrol engines which drive a generator for what is claimed to be the first no-volt alternating current system ever used in an aero plane. The disposition of the defensive armament (mounted mainly in streamlined "blisters") will be gathered from the photograph of the machine in the centre of the group on this page. The Seversky P-35 fighter illustrated is the fastest military machine in the U.S.A. and eighty-five examples have been ordered by the U.S. Army Air Corps. The Seversky is fitted with a Twin-Wasp engine in a gilled cowling and the airscrew is of the Hamilton constant-speed type. It is interesting to compare the design with that of the new Gloster monoplane (pp. 571 and 579). The Seversky Co. has lately delivered a large number of basic training monoplanes, or what we should know in this country as advanced trainers, to the American Government, but the P-35 is the first front-line aircraft of their manu facture to be ordered in quantities.
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