FREQUENTLY ASKED QUESTIONS

1.    WHAT IS C.O.R?

C.O.R. is an acronym for Coefficient of Restitution. It is a numerical expression between 0 and 1.00 that ranks the energy conservation of the collision of two objects. For example, a C.O.R. of 0.00 means that in a collision between two bodies ALL energy is lost. Conversely, a C.O.R. of 1.00 means ALL energy was retained, and thus the collision is termed 'perfectly elastic'. In the collision between a clubface and the golf ball, the highest COR through to be theoretically possible by golf club engineers is about 0.890. The highest COR yet manufactured in a clubhead is about 0.860. In May 2002, the USGA put an end to a two year disagreement within the golf industry by imposing a COR limit of 0.830 for clubheads. For a golfer with a 100mph swing speed, the difference in carry distance with a clubhead with a 0.830 and 0.860 COR is 5.6 yards. For lower clubhead speeds, the distance difference is less.

2.    UTILITY CLUB OR IRON?

^{4.    HOW CAN I HIT MY DRIVER A LONG WAY?}

Unfortunately, there is no secret formula. The ONLY way to hit your driver a long way is to increase clubhead speed. Clubhead speed is the speed at which the golfclub is travelling at impact with the golf ball. The development of clubhead speed begins with the correct grip and athletic posture coupled with good swing mechanics. Equipment selection is vital, since the correct flex, head design, length, launch angle and spin rate all play an important part. However, a word of warning.....most golfers will of heard of the expression 'Grip it and Rip it! But the trees are full of big hitters and keeping it on the cut stuff is essential. Therefore, swinging within yourself is an important aid in control and as I like to term it 'Hold it and Mould it'.

The graph below provides an indication of the relationship of clubhead speed to carry yardage for both the #5 iron and the driver. Most golfers have a clubhead speed with the #5 iron approx. 83% slower than that of the driver.