Post by dubiousgolfer on Feb 18, 2024 9:13:43 GMT -5
Just wondering if the concept of identifying and categorising swing planes looking at a 'Down the Line' view in 2D is flawed?
Many golf instructors /theorists use the below to try and identify how the swing plane changes during the downswing.
When they describe the instantaneous plane the club shaft is moving within , they look at the above images and use the angle of inclination of the planes relative to the horizontal surface of the ground. But they are ignoring the fact that the 'instantaneous swing plane' is also rotating during the downswing as per the images below. These images show the lead arm plane, but similarly it could also apply to the shaft swing plane too in 3D.
For example, say the club shaft was swinging within the swing plane as shown below from P5.5 , one would look at the above image from a 2D DTL (Down The Line) view and deduce that it was approximately just below the 'right shoulder plane' . Then imagine that the club shaft swung into the impact P7 position as per far right image above . One would then deduce that the shaft had shifted to the elbow plane. But that might be incorrect because the golfer could have just lowered his arms while the club shaft was still swinging in that same instantaneous rotating swing plane at P5.5 to P7. Look at image 'b' below where I've drawn another instantaneous swing plane at impact P7 (ie. red dashed lines) where its base is pointing parallel to the ball-target line. The inclination angle of this 'rotating' club shaft swing plane with the horizontal z axis line is 'α' at P5.5 (image 'a') and could theoretically remained at constant 'α' angle at impact P7. In 2D one would have said the shaft had shifted planes during the downswing from 'right shoulder plane' to elbow plane. But in 3D , the shaft could have swung on a single rotating plane whose inclination angle with the surface of the ground was constant.
Even measuring the angle 'α' relative to the Z axis seems incorrect (look at image below) although I could be mistaken.
Shouldn't we be measuring angle 'θ' not angle 'α' ? That might be quite complicated to do but at least it would reflect the 3D reality of swinging in instantaneous rotating planes relative to the horizontal surface of the ground.
DG
Many golf instructors /theorists use the below to try and identify how the swing plane changes during the downswing.
When they describe the instantaneous plane the club shaft is moving within , they look at the above images and use the angle of inclination of the planes relative to the horizontal surface of the ground. But they are ignoring the fact that the 'instantaneous swing plane' is also rotating during the downswing as per the images below. These images show the lead arm plane, but similarly it could also apply to the shaft swing plane too in 3D.
For example, say the club shaft was swinging within the swing plane as shown below from P5.5 , one would look at the above image from a 2D DTL (Down The Line) view and deduce that it was approximately just below the 'right shoulder plane' . Then imagine that the club shaft swung into the impact P7 position as per far right image above . One would then deduce that the shaft had shifted to the elbow plane. But that might be incorrect because the golfer could have just lowered his arms while the club shaft was still swinging in that same instantaneous rotating swing plane at P5.5 to P7. Look at image 'b' below where I've drawn another instantaneous swing plane at impact P7 (ie. red dashed lines) where its base is pointing parallel to the ball-target line. The inclination angle of this 'rotating' club shaft swing plane with the horizontal z axis line is 'α' at P5.5 (image 'a') and could theoretically remained at constant 'α' angle at impact P7. In 2D one would have said the shaft had shifted planes during the downswing from 'right shoulder plane' to elbow plane. But in 3D , the shaft could have swung on a single rotating plane whose inclination angle with the surface of the ground was constant.
Even measuring the angle 'α' relative to the Z axis seems incorrect (look at image below) although I could be mistaken.
Shouldn't we be measuring angle 'θ' not angle 'α' ? That might be quite complicated to do but at least it would reflect the 3D reality of swinging in instantaneous rotating planes relative to the horizontal surface of the ground.
DG