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Constantin et d'Astanières No2 biplane

This second design of the duo Louis Constantin (designer) and M. d'Astanières (sponsor) never participated in the Concours de la sécurité (1914) for which it was intended, because it was not ready and still had problems that needed to be fixed. The machine was claimed to have three special features: A special design of the leading edges of the wings to improve their efficiency, automatic lateral stability by negative dihedral wings, and improved longitudinal stability by minimal its longitudinal moment of inertia. The last two of these appear rather counterintuitive, but perhaps... It was first tested only days before the outbreak of WW1, which stopped any further experimenting.

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