[ChrisNZ]

The other interesting thing in Miura's article (by the way, it was in a journal called Sports Engineering), was that his study of better golfers, showed that the club did NOT trace the expected arc at the bottom of the swing. (Not wanting to raise any trouble here!). Instead, the club was pulled inside the expected arc, creating (Miura claimed) a flat spot in the swing. It can thus be assumed, that Miura at least, felt that a pull against the direction of centrifugal force (shortneing of radius?) improved both power (acceleration through impact and therefore compression I guess) and accuracy.

What I find interesting about this is I have stood behind good golfers, and watched them swing with what looked to my eye like an outside to inside action. The only thing was, their supposed 'cut shots' started straight and either stayed straight or drew (they were NOT pull hooks), plus they went far. Could this be the parametric acceleration motion Miura described?