TECHNICAL REPORT NO. TR-AC-47: JOINT ATIC-WADC REPORT ON PROJECT SILVER BUG

This technical report, dated February 15, 1955, provides an evaluation of a proposed circular aircraft design by A. V. Roe, Canada, Limited, known as Project Y2 (Secret). The report was prepared jointly by the Air Technical Intelligence Center (ATIC) and the Wright Air Development Center (WADC) to address public misconceptions regarding 'Flying Saucer' stories and to assess the military potential of the design. The document clarifies that the project is a legitimate engineering investigation into a supersonic research aircraft with vertical take-off and landing (VTO) capabilities. The design utilizes a radial-flow gas turbine engine and a circular airframe, which the report suggests could solve the USAF's requirement for operating from dispersed bases by eliminating the need for long runways. The aircraft is designed to use a 'ground cushion effect' for take-off and landing and employs the 'Coanda effect' for jet bending to control the vehicle, replacing conventional aerodynamic control surfaces. The report includes detailed technical specifications, weight breakdowns, and performance estimates, projecting a maximum level speed of 2,300 mph with reheat and a ceiling of 80,600 feet. The authors conclude that there is no fundamental reason why the proposal could not result in a viable weapon system, but they recommend a two-fold intelligence program: maintaining liaison between WADC and ATIC personnel to follow the project's technical progress, and initiating a collection effort to determine if the Soviet Bloc is conducting similar research. The document notes that the project was delayed pending higher headquarters decisions but was slated for a study contract in the near future as of late 1954.