quote:Originally posted by MizunoJoe
This is what you are "convincing" me with? You say, "The collision between clubface and ball can be treated very conveniently using...". And write some sort of equation. Just how am I to know that's true? Then you do a bunch of substitutions, etc. and declare that, "The above analysis is totally sufficient in itself...". Again, how do I know that? You need to publish your paper so that it can be judged by those who do such things - like that annual Sports Science Conference or whatever it's called.
Then you again bring up C&S. I can speak to that. First, you say that the difference between the stressed shaft test and the hinged shaft test is "negligible". Not if the 2 wood is only hit 220 yds. Even 20 yrs back, tour players were CARRYING 3 woods 250+ yds. I have doubts that the testers had a golf swing that sufficiently compressed the ball to begin with. But in spite of that, the stressed shaft had a distance advantage of 5 yds, which is significant, and even more so if the swing had a bent left wrist through Impact.
However, the most conspicuous statement in your "analysis" is that the hinged clubhead "BARELY BENT BACK AT ALL". That is to say, it DID in fact cushion the weight of the clubhead rather than completely resist it. Since the hinge was just above the clubhead, this is significant. Does Homer make a quantitative claim on the amount of distance gain from not cushioning the ball? Didn't think so!
I suggest that before submitting your paper to a proper review commitee, you use a tour quality swing to redo the C&S testing and include it.
MizunoJoe, first you are nagging me repeatedly to produce the mathematics, being probably convinced it could not be done. Now that I have given you the mathematics, as a Christmas gift, you reject it as being of no real use. Make up your mind, you just can’t have it both ways, that is childish.
I can assure you that my science posts takes much longer to produce than your usual one-liner. At least I hope you appreciate that aspect, but just don’t challenge me too much. There is golf as dynamic activity of the body, you are probably very good at it. There is also golf looked at from a scientific view point. It is obvious from your post that here you better keep a low profile.
I fully realize that it is virtually impossible for you to accept my ideas since it is very important in TGM and around you in the golfing world. Try to imagine, for only a few minutes, that perhaps I might be correct with my ideas. If so, would that not suggest to you that science could have a useful place in golf. It could prevent generations of golfers to run after wrong ideas and concepts. Just think about that a bit, it does not hurt.
Just to help you in your thinking, try to make a clear distinction between (1) a torque being applied to the shaft (‘loading’) during any point of the downswing except for (2) any action taken during the extremely small interval of .0004 sec collision dwell time. Two totally different worlds. Many just mix them up as if one and the same. Don’t!
It is not so complicated to really require mathematics. Just start thinking a bit about what good could you possibly do in only .0004 sec? Forget Homer. Give it a try, just try to feel it with your guts.
The collision between ball and clubhead is extremely violent. During impact the ball exerts a force, exceeding 3000 lbs, back onto the clubface and vice versa. How on earth is the golfer, exerting only a minuscule force on the clubface, going to make a difference, when the club face and ball are exerting these huge forces? You can 'sustain' all you want or whatever, it makes no difference.
Just try to convince yourself that during these .0004 sec you, and the shaft, simply don’t exist anymore for the clubhead. It is terribly alone, effectively completely ‘disconnected’ from the shaft, having a violent, one-on-one, confrontation with the golf ball, trying to put that silly ball into a nice orbit to please its master, you the golfer.
The only thing that counts at impact is how much kinetic energy you have generated up until impact for the clubhead. At that precise moment the clubhead says, "sir, excuse me, but I have some private business to take care of". And .0004 sec later, exhausted but happy, it is back again to let you control again the remaining of the swing.
mandrin
