Is golf swing planar or not?

Report
Young-Hoo Kwon, Ph.D.
Biomechanics Laboratory
Texas Woman’s University, Denton, TX
6th World Scientific Congress of Golf, Phoenix, AZ
Accuracy & consistency:
• Distance
• Direction
Planar Motion?
• Planar motion = the simplest shape of motion
• Simple motion  more accurate & consistent
swing
Impact Conditions:
• Motion of the clubhead (velocity)
• Orientation of the clubface
• Location of impact on the clubface
2
Swing Plane:
• A frequently used but misleading concept
Controversies:
• Different definitions
• Single vs. multi-plane
• Swing planarity
Mechanical Meaningfulness:
• Plane of motion of the club
• Directly related to the impact conditions
3
All phases include BI.
TB
MF
ED
New Approach:
MD
(Kwon et al., 2012)
• Clubhead motion-centric
• Portion of the downswing
4
TB-MF
ED-MF
MD-MF
5
Actual Trajectory
Projected
Trajectory
Instantaneous
Rotation
Center
Rotation
Arm
Slope
Direction Angle
6
Planar
Semi-Planar
Spiral
7
Double-Pendulum
Triple-Pendulum
Backswing
Plane
(Hogan & Wind, 1957; Cochran & Stobbs, 1968)
8
Motion Planes of the Arm/Shoulder Points
L shoulder Plane
L hand Plane
9
Right
Shoulder
Left
Shoulder
Right
Elbow
Left
Hand
10
11
One-Plane
Swing
(Hardy & Andrisani, 2005)
Two-Plane
Swing
12
13
(Haney & Huggan, 1999)
14
15
TA
LB
TB
16
ED
MD
BI
17
Shape of Trajectory at BT
Smooth
Sharp
18
Sharp Transition near BI
Impact
Impact
19
A Bogey Player
20
Yes:
• A well-defined FSP could be determined
regardless of the overall shape of the swing.
• FSP can be used in characetrizing a golfer’s
swing.
No:
• Motion planes of the arm points show large offplane motions of the major players of the multipendulum model.
• Validity of the double- & triple-pendulum
models is questionable.
21
22

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