Radius of Gyration and Moment of Inertia...is smaller
Don't bother looking it up in the little yellow book....
Here I'll save you the effort:
Radius of Gyration def:
The distance(radius) from an axis of rotation to where the Mass of an object(The club) would have to be concentrated to create the same moment of inertia of the entire object about that axis: meassured in units of length or expressed as meters in SI; a scalar quantity
- Biomechanics of Sport and Exercise 2nd edition, Peter M. McGinnis,p.394
Take a baseball bat and swing it from the handle...now flip it around a swing it from it's barrell...the overall mass of the bat is the same however the concentration or distribution of its mass is different thus affecting it's moment of inertia..which is the difference of what you felt swing the bat from either end...This is major reason why Mac sets-up the way he does ...
Lower hands brings in this distribution of mass along the adjustable radius where as raised hands moves this distribution of mass further out and its moment of inertia....Affecting the Moment Arm....
as- i think i'm beginning to understand how the low hands position reduces the radius of gyration and reduces the MOI but i'm still lost on the (not) vertical arm position deal ... how should the arms hang and is the primary benefit of this non-vertical condition also a reduction in the MOI?
The arms appear verical/slightly in due to the increased waist bend ,knee bend, and a sharp #3 Accumulator with the shaft located in the base of the fingers ...which is BTW ...lower in the hand than the recommended heel pad...remamber..this is key... the arms are OUT from the Torso(That is bent forward 40-45 degrees and if the arms are"vertical" means they are OUT from the waist bend 40-45 degrees even though they appear to hang IN....Now do you see??? You ask great questions....Sincerely!!!
ok, think i'm making progress here but where is descarte when u need him, let me know if i have this right ... so if the torso is inclined ~45 deg to the horizontal then the arms would be vertical to the horizontal if they were in an acute 45 deg to the torso, now if the correct condition for the arms is ~90 deg to the torso then the arms would hang an additional 45 deg which is ~135 deg to the horizontal ... is this correct or have mucked this up? ... thanks again
I think...you're reading me ...BUT...it isn't the Arms as in plural ...perhaps the right forearm on the downstroke which would require a shift....
BTW I like your description of the arms acute 45 degrees to the Torso comment...now were looking at segment angles as well as joint angles...nice...very nice...
Keep it up with the Quantitative Analysis...it only provides strength to the Qualitative Analysis of TGM
I think...you're reading me ...BUT...it isn't the Arms as in plural ...perhaps the right forearm on the downstroke which would require a shift....
BTW I like your description of the arms acute 45 degrees to the Torso comment...now were looking at segment angles as well as joint angles...nice...very nice...
Keep it up with the Quantitative Analysis...it only provides strength to the Qualitative Analysis of TGM
Now I see it, clear as can be! In the sequences posted, from release through follow-through, Mac's right forearm looks to be tethering around the spine...Vijay's is just all over the place. Annakin, now I see why you classified Vijay's move as XXX rated! I can also see (at least I think I can) why Mac's set-up works for him. However, would this be something you would recommend that mere mortals copy, or without sufficient knowledge would that be sailing into dangerous seas?
Linear Mode
