Why is thrust and "heavy" more important than speed and "dainty"?
2-K has your answer.
When there is effective clubhead mass, the much discussed flat left wrist/bent right wrist, the clubhead has not passed the hands. If and when it does, the clubhead is no longer accelerating - it is decelerating as discussed in 2-K. So, while swing speed rightfully is discussed as a key to distance, it must be accompanied by clubhead lag to really be taken advantage of.
On thrust, see 6-F-1 in addition to the 2-M reference.
There is more on why heavy and dainty are important, like Yoda said, extending the swing radius, hinge action, etc etc....but purely on swing speed itself, 2-K should be what you are looking for.
-Patrick
When the Left Wrist Bends and the Club is thrown, the Shortened Radius (at the Left Wrist) does, in fact, cause the Clubhead to speed up (due to the Law of Conservation of Angular Momentum). And, if Impact occurs before the 'Swingle passes the Handle' (2-K), the player has complied with the Law of the Flail. Therefore, it is possible for this procedure to produce a Clubhead Speed greater than that produced by the Flat Left Wrist and the 'Sustained Lag.' But, as I stated in my prior post, this marginal increase in Clubhead Speed comes at a great price:
1. Loss of Stroke Radius, Effective Mass and for Swingers, the built-in resistance to Release Deceleration); and
2. Loss of control of the Clubface (which requires the Flat Left Wrist, Hinge Action and Rhythm).
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