[no_mind_golfer]

NM - you agree with Jorgensen re. shaft flex behaviour in downswing?

He concludes (from examining the shaft behaviour of one golfer) that the "flexing of the shaft forward as the clubhead comes in to hit the ball is a general characteristic of the golf swing. Photographs made with the use of a focal plane shutter must be ignored in this context. There are few photgraphs in the golf literature made with stroboscopic light sources, but of those I have examined, all of them show clubs flexed in this manner"

So exclude focal plane shutters and some video cameras ...before theorising too much about shaft flex photos .

Well........ (deep subject I know)

I think Ted jorgensen did a good job and I strongly agree with is concern re interpreting photographs... but its been a while since I read his book... I'm not sure what he means by that statement.

On the matter of club shaft flexing I agree with Wishon (inertial loading from the top is generally speaking in the wrong plane to contribute CH speed at impact due to "snapping back" and I agree with Sasho MacKinsey : http://library2.usask.ca/theses/avai...ted/Thesis.pdf

who says basically shaft bend is mostly toe down and forward (which adds dynamic loft to the club head) as a result of the centripetal force pulling towards the instantaneous center of rotation against the club head's inertia . Its act on the CG of the clubhead. Imagine you could tie a string to the CG of your clubhead and then you did a tug of war.... the shaft would bend like we see in the pictures (toe down and forward)

Post impact all bets are off.... other dynamics come into play as the club rapidly decelerates. But we should not care what happens after the ball is gone IMHOP.


BTW... I'd sure like to see some equip mfg.s do that (design a driver that had the hossel in-line with cg of the clubhead.... There would be whole lot less bending going on I bet... more consistent shots for sure... No more toe down , closing of the face, dynamic lofting etc. .... just a thought. Probably would look funny though and nobody would buy it..