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 onNovember 29,1936, but this was not attributable to variable-wing mechanism, which was intact.

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