This may be inconsequential to the plane line tracing discussion, but from the clubmaking forums I frequent I have seen the following regarding clubhead/shaft lead (bending forward toward target) and droop:
-The maximum amount of lead or droop is determined by the Center of Gravity (CoG = Sweetspot?) of the head. Theoretically, the shaft should be able to bend no more than in-line with the CoG.
-This maximum amount of lead or droop is by no means always guaranteed and is dependent on swing and shaft characteristics.
-While the centrifugal force is primarily reponsible for this bending toward an in-line condition with the CoG, it is also creating a force that pulls outward (away from the golfer) which creates an effect called "centrifugal stiffening" with the net result being that the forces requried to bend a shaft in motion (in a rotational sense) can be much higher than those required to bend a shaft at rest.
Can you give some pointers to "centrifugal stiffening "discussion? I've been ignoring club building forums for some time and quick googleing seems to point to useless abstacts.
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