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Swing A and Swing B produce similar club speed and attack angle with the same driver, but A produces 20 yards more distance than B. The “gear effect” helps us understand why.
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What you can’t see in the above image is the impact location on the club face. In swing A, face impact was slightly toe-side of center, while in swing B, face impact was heel-side of center.
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A toe-side strike causes the face to twist open at impact, creating a counter twist in the golf ball that imparts side-spin for a draw shape. The opposite applies for a heel-side strike (face twists closed at impact, imparting the side-spin for a fade shape). In our example, the higher spin rate of the heel-side strike accounts for the 20-yard distance loss.
The amount that gear effect impacts ball flight also depends on how far away from center you strike the ball as well as what your swing path is.
Once we know your strike pattern and swing path, we can get you into gear with the correct shaft, loft and face angle.