As a Trackman owner, when we talk about ball flight and curvature we use the D-Plane model. For those that don't know, D-Plane is made up as a plane space created by the angle created between the club's path, attack angle, and where the face is pointing at impact. The ball's axis of b ack spin, is always 90* perpendicular to the shape of that plane and this model works well for describing why shots curve how they do in the air. The problem with the D-Plane model, however, is that is ONLY works when the ball is struck perfectly. What I've found in my experiences with Doppler technology, that the majority of shots that create undesireable ball fights are more a result of off-center hits than face and path differences.
This is known as gear-effect and seems to have a profound influence on almost all golf shots. Just yesterday evening, saw several swings that produced a noticeable cutting action that would have lead me to believe she was swiping across the ball with a leftward path. Her Trackman numbers indicated she had a positive ( inside out) path of 2* and was reading face angle measurements closed ( -2 or higher). She was making contact toward the heel consistently. I've even seen similar results with elite tour-level players. A former Reno-Tahoe winner was hitting push-cuts with a positive swing path because of the same scenario. When he went back his natural path ( slightly left) and hit his normal baby pull cut; impact dramatically improved. I see this consistently at all levels, and am curious if or how you guys self-diagnose or analyze whether location of the strike is causing issues or a path/face situation. Again, i'm not referring to 'obvious' toe or heel hits, but this phenomena occurs even on mishits by a couple dimples on the ball.