Harry C Gammeter, Cleveland OH. Gammeter Orthopter Orthopter 1907 = 1p ornithopter; 7hp @ 1200rpm Curtiss; span: 30'0" length: 12'0". Gross wt: 440#. Those are the total specs found for this creation with bamboo-and-silk flapping wings, double-hinged to the fuselage and flapping 75...