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Irvine Aerocycloid
The photograph shows a quarter-size model of the Irvine Aerocycloid of 1908/1909 which was able to lift the weight of ninety pounds. The San Francisco based John C. Irvine (president of the Pacific Aero Club) had worked three years on the machine, which was driven by a 3 hp electrical engine, that could lift 30 pounds for each hp. Records do not show that the full-sized model was ever built, probably due to problems with financing of the project. The specialty of the machine was of course the two upright wheel construction, driven by cables, which carried four “propellers” which pivoted between the wheel and furnished the lifting power. With the propellers in the proper position the force would be upright, lifting the machine vertically. Pivoting the propellers at an angle would obtain a forward motion.
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