[hcw]

We seem, however, to have moved well away from the original issue, being swing power generation from the ground up - a ridiculous concept if ever there was one - and it might now be time to bring this discussion to a conclusion.

I conceed that the body "transportation" not only facilitates the free, on plane, swinging ("transportation") of the arms but has a secondary function in that there is a little (about 10 ====> 15% I understand) enhancement of swing speed.

What I cannot agree is that there is any force that can be brought to bear from the ground up that will propel the club down, nor can I subscribe to the theory that hip rotation causes the arms to swing down and, somehow, powers their motion.

Nevertheless, I reckon we must all be about through with this subject by now so - probably to everyone's great relief - I will butt out.

i think lagster's original question was where did the long-drive guys have the highest acceleration and how did they accomplish it...my theory was that it is at impact an they achieve it by starting the acceleration with things furthest from the clubhead (legs/hips) and then add acceleration of the parts in sequence (torso->shoulders->arms->wrists/hands->clubhead) and waiting as long as possible to release the clubhead...that "little" 10-15% enhancement you mentioned would be the difference between 300 yds and 330-345 yds...an enhancement most would welcome i believe...as for how the ground forces help out i found this interesting site when i searched for info on cricket bowling:

http://www.rlca.com.pk/biomechanics.asp

...check out Figure 4. and the paragraph above it (hint: in golf the hip bump/slide/rotation = the run up+leap)...i already tried to illustrate how in a golf stance rotation of the hips can move the arms/hands/club up and down the inclined plane...since that didn't do it for you i think it is also time for me (on this subject) to keep silent!

-hcw