Those are excellent questions. I don't know the answers.
I can understand that if a shaft flexes, that it has inherent elastic properties that will induce it to spring back to a straight line alignment. Therefore, when one sees a clubhead ahead of the hands/central clubshaft at impact - the question becomes - did that phenomenon happen because the clubhead's momentum caused the clubshaft to flex forwards or could there be a spring-back clubshaft-flex action due to the fact that the clubhead was lagging behind the clubshaft earlier in the downswing, causing the shaft to bend backwards, and now the clubshaft is simply flexing forwards in response to being previously stretched the other way (a whiplash action).
Do you have any insights to share that can differentiate between these two theoretical possibilities?
I imagine that the clubshaft should behave very differently between a hitter and a swinger. A hitter applies a push-force continuously on the clubshaft all the way through impact. I imagine that there is therefore less of a whiplash phenomenon. By contrast, a swinger induces a definitive whip lash motion, in the sense that pull-power is imparted to the clubshaft during the early-mid downswing, and no further power is imparted to the clubshaft during the near-impact phase of the downswing. At that time point, the clubshaft is moving towards impact due to the passive release of PA#2 ( due to centrifugal forces). I could imagine the clubshaft behaving very differently under those conditions.
Please share any insights you have regarding this matter.
I don't imagine that an upright versus a flat plane should have a significant effect. Do you?
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