When you hit a striped ball with bottom-left english, and the stripe is initially aligned with the english direction, the stripe appears to “flip” during the shot. How does this work?

The following video demonstrates and explains (with the help of high-speed video) how the spin axis changes as drag converts bottom spin to forward roll, while sidespin persists. Here it is:

Check it out and give it a try. It’s a cool visual demo.

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