Wilbur, who was at one end, seized it in front, Mr. Daniels and I, who were behind, tried to stop it by holding to the rear uprights.
Lilienthal was the first to discover this exceedingly though our measurements differ considerably from those of Lilienthal. While important fact, which is fully set forth in his book, “Bird Flight the Basis of the Flying Art,” but owing to some errors in the methods he used in making measurements, question was raised by other investigators not only as to the accuracy of his figures, but even as to the existence of any tangential force at all. Our experiments confirm the existence of this force, at Kitty Hawk we spent much time in measuring the horizontal pressure on our unloaded machine at various angles of incidence.
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While our measurements differ considerably from those of Lilienthal, Lilienthal was the first to discover this exceedingly important fact, which is fully set forth in his book, “Bird Flight the Basis of the Flying Art,” but owing to some errors in the methods he used in making measurements, question was raised by other investigators not only as to the accuracy of his figures, but even as to the existence of any tangential force at all. Our experiments confirm the existence of this force. At Kitty Hawk we spent much time in measuring the horizontal pressure on our unloaded machine at various angles of incidence.