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Probable GOLF Instruction
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How to Sink More Short Putts -- June 20/13

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Golf Club Grooves & Backspin

Do the grooves on the face of a golf club produce backspin?

What's all the hype about the USGA's new groove rules?

The backspin is created by the balls compression on the clubface. This occurs between the time of impact and the moment of separation from the clubface. The clubs swing path and type of head rotation sees the ball mashed into the clubface.

High-speed photography has verified that the ball "squishes" against the surface of the club. The friction between the club face and the ball is what creates the backspin in the same way that throwing a ball at an angle towards the ground will cause the ball to spin.

The more loft the greater the backspin. The grooves have some influence on the launch angle or backspin on the ball. Well known club designer Ralph Maltby built a set of irons with no face grooves at all and played with them extensively to prove this point to disbelievers.

In the mid 1980's the USGA undertook extensive groove type testing and concluded that in dry conditions it was loft, not grooves that put the majority of backspin on the ball.

So what is the function of the club's grooves? They are like the treads of car tires. Tires with no treads would work perfectly well on dry roads. However, we need them to work in the wet as well. The treads channel away water so that the rubber of the tire stays in contact with the road. The treads prevent "hydroplaning."

Clubfaces without grooves work fine in dry conditions but with water and grass in the way, the grooves allow some of the trapped materials to be moved from the collision zone. Without grooves you may get a high flyer with less spin and in this instance the ball does in fact run up the face - it actually skids up the face on the lubricating water and/or grass.

Don't bother buying one of those "groove sharpeners" that are advertised. They'd only make a slight difference from the rough and/or when it's wet. And, do you know how long you need to grind those grooves with that little tool to make any kind of difference? Golf club metal is really hard!!

In the mid 1980's the USGA undertook extensive groove type testing and concluded that in dry conditions it was loft, not grooves that put backspin on the ball. These tests were a follow-up of the tests done by Cochran & Stobbs published in the 1968 classic, "Search for the Perfect Swing"

In 1968, researchers weren't sure about the exact interaction between the ball and clubface at impact. There was speculation that the ball skid up the clubface, gaining backspin during the slide. Now that we have awesome technology, that question as been answered. View the slow motion video below.

 

The Medicus Power Meter

Power Meter measures Swing Speed

 

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