By von Kármán, Theodore
Fascinating, reader-friendly chronicle by means of a well-known pioneer in aerodynamic learn lines the advance of dynamic flight from the time of Newton during the twentieth century. It recounts struggles of engineers and physicists with difficulties linked to raise, drag, balance, aeroelasticity, and the sound barrier. The booklet includes seventy two figures.
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Additional resources for Aerodynamics - Selected Topics in the Light of Their Historical Development
Circulatory motion of the air in the same direction in which the ball rotates. , perpendicular to the trajectory of the ball. If the lift is positive, the effect is equivalent to an apparent decrease of gravity; if the lift is negative, it seems to add to the gravity. In the first case the range of the ball is increased, in the second case decreased. The baseball pitcher uses the same effect of spin, directing the ball in a way favorable to his team. The reader may remember that a German enginecr, Anton Flettner (Ref.
17). In the theory of , Fig. 17. Translation, rotation, and distortion of a fluid element. , . ,I(; '. #' #' ROTATION by& _/-- t 8. "& t DISTORTION- , , '\ fluid mechanics we call a fluid motion in which the rotation is zero, so that the element is only translated and distorted, a potential Pow or a uortex-free jow; whereas, if the element also rotates, we call the flow a rotutionuljpow or a umtexjow. The term THE T H E O R Y O F LIFT potential flow originates from the mathematical concept of the velocity potential.
The action of the cylinders as sails was interesting and successful. The ultimate failure of thc invention, however, was due to economic reasons. The practical application was intended for cheap freighters or ‘fishing boats. But unfortunately the cylinders had to be driven rather fast in order to obtain significant propulsive forces, and this made necessary the use or ball or roller bearings and the employment of a skilled mechanic for maintenance. The resulting expcnses were too high for fishing boats, and the supposed profit in comparison with conventional ship propulsion became illusory.