1849 boy-carrier showing the dihedral

(a) Rear view of the 1849 boy-carrier, showing the dihedral angle of the triplane wings, and imaginary flappers of bird-wing form (b) the favoured form of propulsive flappers in 1853, to be used on the coachman-carrier of 1853 (c) the levers for working the flappers. From Cayley's original notebook

1853 Cayley Cayleys Coachman Dihedral Favoured Flappers Imaginary Levers Notebook Propulsive Triplane

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