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【The Geometry of GOLF】 4. Attack angle, Loft and Back spin

It is wrong that the more you hit the down blow with an iron, the more backspin applied so that it is easy to stop on the green. As long as you hit with the same club, if there is no shaft lean at the lowest point of the swing arc, the amount of backspin will not change even if the attack angle becomes negative and large. This is because the amount of backspin is determined by the spin loft if the head speed is the same. Spin loft is determined by the difference between the impact loft and the attack angle. Spin Loft = Impact Loft-Attack Angle For example, if the club loft is 40 degrees, the attack angle is -5 degrees, that is, if the attack angle is 5 degrees down blow and the shaft lean at impact is also 5 degrees, the loft at impact will be 35 degrees, but the spin loft will be 40 degrees, and the amount of backspin is the same. Here, assuming that the shaft lean is the inclination of the shaft seen from the front at the point of the impact and the lowest point of the swing arc, if the shaft lean and the attack angle at the time of impact are the same, the shaft and the club path are at right angles. The shaft lean at the lowest point is almost zero (that is, vertical). However, this is not always the case, and the shaft lean at the lowest point may not be zero. Many PGA professionals have a hand-first impact, so the shaft is tilted to the direction of the target line at the lowest point of the swing arc, the shaft lean at the time of impact becomes larger, and the shaft and club path are It is smaller than a right angle. The impact loft will be smaller by that amount, but the spin loft can be made smaller without changing the attack angle. Certainly, PGA Pros, etc., whose drivers head speed of over 50 m/s, so they have a hand-first impact to suppress back spin. However, if you are an player with a head speed of 45 m / s or less, you do not need to suppress the spin, and the advantage of making it hand first is that you can hit with 8 iron instead of 7 for example. However, in this case, since the spin loft does not increase, the amount of spin does not increase and the launch angle becomes low, so it is not much different from hitting with 7 iron. Therefore, it can be said that there is not much merit when hitting with 7 iron without making it hand first. However, if you hit with a down blow (with a larger attack angle) to some extent with 8 iron, you can also hit a distance of 7 with the amount of spin you hit with 8 iron. With irons, the lower the launch angle, the longer carry. If it is lowered by about 4 degrees, it will carry about 1 extra iron. Therefore, by hitting with a more down blow in the smaller club, that is, the club with a larger loft, if you can carry the same distance, the amount of backspin will increase and it will be easier to stop on the green. If you hit the same distance with a smaller club, a larger backspin will be applied and it will stop on the green, but if you hit a more down blow with the same club, slow down the head speed and aim for the same distance, the backspin will be smaller and the launch angle becomes smaller, it results difficult to stop on the green. In other words, in order to hit a ball that is easy to stop without increasing the head speed, it is necessary to hit a more down blow, increase the carry distance, and hit the same carry distance with a club with a larger loft. Also, if you increase the shaft lean without increasing the degree of down blow, you can increase the carry distance without increasing the amount of backspin.

最終更新日:2021-04-12 11:56:35

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