[Jeff]

Mike - I don't have an image with the ball on the clubface. I only have the still photos from GD magazine. I really need a slow-mo swing video of his swing (captured at >500 frames/second) to be able to get a capture image of the ball on the clubface. Why is it important?

By the way, I looked up the topic of "flexible shafts" in Jorgensen's book "The Physics of Golf". He is very vague in his calculations and he claims that shaft flexibility can increase clubhead speed by 3%. He does not discuss whether any increased forward shaft flex at impact is solely due to the whiplash phenomenon of shaft flex or whether is it due to the "effective mass of the clubhead" at impact.

I am going to PM nmgolfer, who is a forum member, and ask him whether he can shed any light on this issue.

Whether the forward shaft flex at impact is due to shaft flexing (whiplash effect) or due to the clubhead's large momentum (due to its >160mpmh speed) at impact, it seems to be an incontestable fact that the peripheral end of the clubshaft is flexing forward. What is interesting to me, is that the clubhead/clubface is not-in-line with the V-groove of the hands. Normally, when analysing swing videos of professional golfers using my V1 Home software program, one doesn't see the clubhead ahead of the hands at any time point during the downswing, and I don't think that the forward shaft flex is intentional. If Jamie was intentionally flipping his hands at impact to get the clubface to go upwards into the teed ball, then the V-groove of the hands should be in-line with the sweetspot of the clubface.

Jeff.