This is from Tom Wishon (www.Wishongolf.Com) and his today's e-Tech publication which I consider is a ought to examine for extreme golfers (even though they do not personal Wishon device).
One of the areas of hobby to more done players is the problem of whether or not a driver head may be designed to deliberately supply a better or decrease amount of backspin on the shot. Thanks to the extra presence of release monitors blended with the reviews from the professional tours that top gamers all attention on hitting the driving force with among 2,000 and 3,000 rpms of backspin, a totally excessive variety of players today appear to be passionate about locating a driving force that will deliver a spin size on this desired range.
The cause of this text is to sincerely kingdom what's and is not viable with admire to designing a driving force head to deliver a difference in backspin overall performance.
First off, when a golfer hits drivers and notices a distinction in spin between the two, it's miles very hard to recognize precisely what introduced about the spin distinction. To without a doubt recognise calls for a trying out manner that need to isolate every possible variable between the 2 drivers that contributes to spin. Few golfers are in a role so as to do this in a completely controlled surroundings. Hence it's miles very not unusual for a golfer to hit two drivers, see that one launches the ball decrease or with much less spin, and make the incorrect conclusion approximately what precipitated the ones differences in the shot.
The factors which could bring about a distinction in spin among two driving force heads are:
1. Loft – obviously the lower the loft, the lower the spin with all other things being equal. The problem with assuming that a loft difference brought about a spin difference is the fact that the real loft of a driver head often times is not what is stated on the head. +/- tolerances as well as some companies’ intentionally making some of their driver heads with a different loft than what is stated makes this comparison more difficult. Hence the ONLY way to know the difference in loft between two driver heads is to have the lofts measured by someone who is very experienced in doing this, using the proper precision equipment. Robot tests we have done show a spin difference of 260 rpms for each 1° change in loft at a clubhead speed of 100mph, for the same center face impact point. (And of course, as clubhead speed increases so too does the spin and vice versa)
2. Vertical Roll Radius – All driver heads are made with a certain amount of radius up and down on the face. (there is also the hoizontal radius on the face, but that is not pertinent to this discussion) Not all driver heads have the same vertical roll radius. The more roll (meaning more curvature as indicated by a lower radius number in the measurement) the higher will be the loft above the center of the face, and the lower will be the loft below the face center. The less roll, the less the loft increases above the center of the face and the less the loft decreases below the center of the face.
3. Point of Impact on the Face– FOR THE SAME LOFT and FOR THE SAME VERTICAL ROLL RADIUS, impact above the center of the face reduces spin due to the phenomenon of VERTICAL GEAR EFFECT. Likewise due to VGE, impact below the center of the face increases spin. VGE can be quite significant. Our robot tests done with the same driver head at 100mph with the same ball show a spin reduction of 400rpms for impact 1/2? above the face center and a 400 rpm spin increase for impact 1/2? below the center of the face.
4. Face Angle of the Driver Head – For some golfers, even a 1° change in the face angle can bring about a slight change in the effective loft of the head at impact that can result in little differences in the launch angle and spin of the shot.
5. Face to Back Center of Gravity Position in the Driver Head - By varying the wall thickness of the head body in the front vs rear of the head it is possible to create a little more forward CG vs little more rear CG position inside the driver head. It is also possible to vary the CG position by using materials of different density (graphite, tungsten, etc) within the head construction which are placed/oriented more to the front or back of the head body. The closer the CG is to the face, the lower the launch angle and lower the spin can be, and the farther back the CG is from the face, the higher the LA and spin can be.
This is a CAN BE because and NOT a ?For sure? End result for all golfers. The motive is because the impact of face to lower back CG depends totally on its effect on the quantity of ahead bending of the shaft getting into impact. A more forward CG can cause the shaft to bend ahead LESS which means that the dynamic loft at effect will not be multiplied as a whole lot, this means that barely lower release attitude and spin. A extra rear CG can purpose the shaft to bend ahead MORE which means that the dynamic loft at impact could be expanded a bit extra, because of this slightly higher launch attitude and spin.
But not all golfers can make the shaft bend forward coming into effect. Only golfers with a later to very past due unhinging of the wrist cock perspective on the downswing are able to make the shaft come into impact in some quantity of forward bend position. The in advance the golfer unhinges the wrist cock perspective, the sooner the forward bending action on the shaft occurs. So for early to halfway release golfers, the shaft goes into its forward bend function earlier than effect so by the point the clubhead receives to the ball, the shaft has had the time to rebound returned from being bent forward. Thus only for later to very past due release golfers will the extra forward CG position in the motive force head bring about a barely decrease release and slightly decrease spin.
The other variable affecting the face to back CG role on spin is the shaft?S stiffness layout vs the golfer?S clubhead speed, transition force, downswing tempo and point of release. The stiffer the shaft usual, and/or the stiffer the top segment of the shaft all in terms of the golfer?S swing characteristics, the much less the shaft can bend forward to have an impact on the launch angle and spin of the shot. And vice versa, the more flexible the shaft ordinary, and/or the more flexible the tip segment of the shaft all in relation to the golfer?S swing traits, the extra the shaft can bend ahead to have an impact on the release attitude and spin of the shot.
6. Vertical Center of Gravity of the Driver Head – While everyone has been taught that a low CG in any clubhead means higher shot and higher spin and a higher CG means vice versa, the vertical CG in a driver head can be a very confusing factor for ball flight because 99%+ of the time we hit the ball with the driver off a tee.
Due to the usage of a tee the placement of the CG of the ball to the vertical CG of the driver head can be all around the map. Golfers tee the ball in all manner of different heights relative to the driver head. Because of this, the factor of impact on the face relative to the CG of the ball can range extraordinarily. This is not nearly as lots the case with the other clubheads which can be a long way more often hit with the ball sitting at the ground.
In addition, because such a lot of motive force heads are designed so close to the same 450-460cc volume ?Length?, driving force heads nowadays really do now not offer lots in terms of a variation inside the vertical CG role as can all different clubheads. When you design a motive force to be near the limit for quantity, owing to the fact the pinnacle can not weigh a great deal extra than 200g, the wall thickness of the body can not be numerous by extra than a small quantity to try to have a distinct effect at the vertical CG role.
As a result, theoretically the vertical CG role will have an impact on launch attitude and spin, however in practice because of the outstanding range in tee peak, point of effect and perspective of assault into the ball coupled with the slender range in motive force length, the vertical CG of a driving force truly does no longer account for plenty of the difference in launch attitude and spin on the shot.
Bottom Line concerning spin traits of different motive force head fashions ? While there may be moderate variations in launch angle and spin from distinct motive force head designs, if the golfer needs to hit the motive force lower or better in top and spin, the number one manner to do that is by way of the use of a driver head with a lower or higher loft than the golfer presently plays. For each 1 diploma change in loft, the launch angle adjustments via zero.8?. And primarily based on a driving force clubhead pace of 100mph, for each 1? Trade in driving force head loft, the height of the shot modifications by way of 10 to 12 feet and the spin changes by using around 250 rpms. These elements follow to ALL golfers irrespective of swing traits. The impact of a alternate within the face to again CG region on release angle, shot peak and spin simplest show up for golfers with a later to very overdue release.
3JACK
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