STRESS ANALYSIS OF 1/12 SCALE HOVERING AND TRANSITION MODEL

This technical report, issued in September 1957 by Avro Aircraft Limited in Malton, Ontario, details the stress analysis conducted on a 1/12 scale hovering and transition model of the P.V. 704 aircraft. The model was developed as part of the 'system 606 A' test program to study the take-off, hovering, and transition-to-forward-flight characteristics of the aircraft. The testing was intended to take place in the 20-foot diameter Memorial Wind Tunnel at Wright-Patterson Air Force Base. The report provides a thorough structural evaluation of the model, its support structure, and the associated fairings. The model is described as circular in planform, with a 35.3-inch diameter, featuring simulated intake and exhaust flows. The support structure consists of a vertical arm and a horizontal tube system, which also serves to supply air to the model. The analysis confirms that the structural design is satisfactory, with an ultimate load factor of 4 applied throughout. The report includes detailed load analyses for various hovering and transition cases, including calculations for internal pressure, aerodynamic loads, and static weights. It also outlines the balance calibration procedures and provides comprehensive indices of drawings and references. The document concludes that the strength of all components is sufficient and that structural deflections are negligible. The report was declassified on June 14, 2001, under the authority of the Air Force Declassification Office.