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Jacques Gerin developed a biplane with variable wing area, the Varivol. Wing trailing edges could be wound in and out by electric motor. Full-scale tests in windtunnel at Chalais Meudon followed by flying tests in March 1936. Pilot M. Demimuid killed in Varivol crash on November 29,1936, but this was not attributable to variable-wing mechanism, which was intact.


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