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THE PHYSICS OF A PROPELLER WRIGHT, ORVILLE. Typed Letter Signed, to O. C. Brett, thanking him for the maple seed pods and discussing the physics of a
THE PHYSICS OF A PROPELLER WRIGHT, ORVILLE. Typed Letter Signed, to O. C. Brett, thanking him for the maple seed pods and discussing the physics of a propeller turning on a vertical axis. 1 page, single 4to sheet, The Wright Company stationery; unven toning, separations along folds with very small loss affecting one letter. Dayton, 5 May 1914
- Notes: "... The rotary motion of the pod in falling increases the quantity of air upon which it acts very much, thus decreasing its rate of descent. The same is true of a propeller turning on a vertical axis. In descending the propeller puts in motion not the quantity of air lying beneath it but all of the air over which its blades pass in their rotary motion. In this way parachutes made in the form of a propeller of quite small area have been made to descend at almost as slow speeds as the ordinary type of parachute with many times more area..."
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