Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 108
but 85 feet, and at a speed of only22 miles per hour, and made a 40-degree turn at atipping angle of 20 degrees. As measured by theinventor, the machine rose in the air with the pilot(weighing 190 lbs.), with a thrust of 140 lbs., andrequired only a thrust of from 80 to 85 lbs. to keepit flying.… … 108 FLYING MACHINES: THE BIPLANE. (designed by Mr. Herring) at the rate of 1^200 rev-olutions per minute. The elevator consists of a pair of parallel surfacesset upon hollow poles 12 feet in front of the mainplanes. The tail is a single surface. The stabilizing fins act in this manner: when…
Aeronautics
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