Sir Barnes Neville Wallis (26 September 1887 – 30 October 1979) was an English scientist, engineer and inventor. He is best known for inventing the bouncing bomb used by the Royal Air Force in Operation Chastise (the "Dambusters" raid) to attack the dams of the Ruhr Valley during World War II.

His many achievements include the first use of geodetic (also known as geodesic) design in engineering and in the gasbag wiring of Vickers' R100 in 1930, which, at the time, was the largest airship ever designed. He also pioneered, along with John Edwin Temple, the use of light alloy and production engineering in the structural design of the R100. Nevil Shute Norway was the chief calculator for the project, responsible for calculating the stresses on the frame.

Despite a better-than-expected performance and a successful return flight to Canada in 1930, the R100 was broken up following the crash near Beauvais in northern France of its "sister" ship, the R101 (which was designed and built by a team from the Government's Air Ministry). The later destruction of the Hindenburg led to the abandonment of airships as a mode of mass transport.

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