Hook Spin

Scientific testing using a fixed robot and a high-speed camera (1000fps) proves that up to 10 rpm of hook or cut spin imparted to the ball is acceptable as having negligible effect.

As soon as side spin increase above 10 rpm, the side spin can cause the ball to bounce and stray from the intended line.

Above, the golf ball has -35 rpm of hook spin. The given value turns RED to highlight the problem. The increased amount of hook spin, even with a good launch angle has produced a good 'True Roll' value (<10%). So hooking the golf ball can actually produce a quicker true roll but can still be the cause of a deflection, especially on a right to left breaking putt (right-handed golfer).

Common causes of too much hook spin

• inside to outside putting stroke
• putter face closed at impact
• striking the putt out of the ‘toe’
• putter with lie angle too high (toe high)