Golfers are often taught a simple rule: swing out-to-in for a fade and in-to-out for a draw. But this is incomplete. Ball flight is not determined by club path alone—it depends on the relationship between Club Path and Face Angle at impact.
This relationship is part of the D-Plane, the three-dimensional collision geometry that determines launch direction and spin axis.
Face Angle describes where the clubface points relative to the target. It strongly influences the ball’s starting direction.
Club Path describes the direction the clubhead travels through impact.
Curvature is primarily influenced by their relationship: Face-to-Path.
Consider a right-handed golfer with:
Club Path: −2°
Face Angle: −6°
Face-to-Path = −6° − (−2°) = −4°
Although the club is traveling left—traditionally called a “fade path”—the face is pointing even farther left. The face is therefore 4° closed relative to the path. The ball starts left and curves farther left: a pull-hook.
This explains why simply “swinging left” cannot guarantee a fade.
WatchItGolf also uses Path-to-Face as an educational way to visualize the relationship:
Path-to-Face = −2° − (−6°) = +4°
Relative to where the face is pointing, the club is traveling 4° to the right. Path-to-Face does not replace the industry-standard Face-to-Path measurement; it provides another way for golfers to understand the collision.
A useful diagnostic sequence is:
Observe the ball’s start direction.
Observe its curvature.
Measure Face Angle.
Measure Club Path.
Calculate Face-to-Path.
Check strike location and possible gear effect.
Trace the delivery back to the golfer’s movement.
Launch data tells us what happened. Biomechanics helps explain why.
Pelvis and chest rotation, alignment and hand path can influence club delivery, while wrist conditions, forearm rotation and arm structure play major roles in controlling the face.
The goal is therefore not necessarily a 0° path and 0° face. Great players create predictable relationships between path and face to produce reliable shot shapes.
With WatchItGolf, coaching moves beyond “swing left” or “swing right.” Measure the collision, understand the relationship, then identify the movement that created it.
Better measurement leads to better coaching.
