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Racket Head Speed and the Arc of the Fan

As the wrist releases after the pull, the racket head quickly whips around in an "inside out" arc. The arc that the tip of the racket travels in is much bigger than the arc of the hand path, causing it to accelerate rapidly in a whip like action.

The Tip of The Racket Whips "Inside Out" In a Fan Like Motion

In this image of a fan, the two colors of the fan represent the path of the racket tip and the path of the hand. Imagine that the tip of the racket follows the path of the outer white part of the fan. The hand, however, travels in the much smaller inner tan arc. By having to whip all the way around to catch up to the inner arc, we get a whip like inside out motion of the racket head. This is how racket head speed is generated.

The Pull, the Slot, and the Stretch Shortening Cycle

After the pull, the tip of the racket will accelerate "inside out" in a motion that resembles an open fan. The tip of the racket travels much farther than the path of the hand so it whips around to catch up.
The white edge of the fan represents the tip of the racket which whips around in an inside out motion. The brown inside of the fan represents the hand that travels a much shorter path.