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0

It seems to depend mainly on the spin. See the comsol.com simulation at https://www.comsol.com/blogs/physics-behind-baseball-pitches/ For the slider, in essence a lateral motion, Just spin it laterally, right to left if you are righty, and it'll curve to the left. The axis of rotation would be vertical, if righty the direction of the angular momentum vector ...


5

As always, read John Denker's wonderful ebook. To quickly answer the question, the equal-time argument is a wrong application of Bernoulli. Bernoulli is right. Bernoulli plus the Kutta condition (air can't flow up over the trailing edge) is what makes flight possible. If one accepted the equal-time argument it would not explain how airplanes can fly ...


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Equal transit time would violate Newton's laws of motion in the sense that the computer simulations that are based on Newton's laws of motion show that equal transit time is false. I don't think you can show that using a simple heuristic argument or a simple equation, but the computer simulations do count as a valid proof, albeit perhaps not one you find ...



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