Quote:
Originally Posted by jmessner  mandrin,
Yes, indeed, there was an unexpected punch line for some of us (me included). I totally ignored the propagation issue as I was more focused on bending of the shaft (assumed zero in this case by definition) disturbing the more normal dynamics. I wasn't even thinking about the time domain. Arghh!
So, now, put the shaft perpendicular to the clubhead path like in a normal swing. I've been convinced that the flexibility of the shaft decouples it from the mass of the clubhead at impact(and therefore eliminates any "heavy hit"), but how does the propagation concept come in to play in this case? Edit for clarity: Is the decoupling due to the shaft flexibility in that clubhead path direction, or is it more due to the propogation delay? Maybe a combination?
Jay |
Jay,
In past posts I have used various types of arguments, each of them showing the fallacy of increasing the ‘effective mass’ of the club head or that of the ‘heavy hit‘. In the thread ‘Golf Impact Physics’ I did mention :
“that the analysis above is based on the traditional 'quasi-static' view of the shaft resisting impact. A true dynamic analysis however should consider the finite propagation time of the impact disturbance up and down the shaft. “
Indeed strictly looking from a standpoint of physics it is definitely the matter of propagation which is to be considered either for the shaft in line or making angle of 90 degrees. But it is easier to convince people with more down to earth arguments than using the more esoteric concept of propagation time.
I took deliberately the extreme inline case as it ‘allows’ to bring into play clearly ALL the weight of the ‘golfer’ behind the ball and yet even then it is completely in vain. Common sense indicates probably to everyone that putting the shaft at an angle of 90 degrees does not allow this anymore.