Just a note - Your test you performed was testing the stiffness of the shaft. Long time ago, there was a similar method used to measure shaft stiffness. Lock the grip end, apply a weight to the other end of the shaft and based on how much it 'Deflected' that would then determine if it was a stiff, regular, etc.
Droop is a function of the stiffness of the shaft based on the forces being applied through acceleration. The Major force will be CF.
Agree totally.
Originally Posted by Martee
It might be easier to see how much it has to deflect by taking a dowel and hold it along the sweetspot plane angle and then picture what this has to be at impact and what it would do for a given swing plane/angle.
Lost me here, am still not firing on all cylinders. I thought your 1.5" was close enough for governament work?
I can easily align sweetspot with handle - w/ dowel or w/o dowel. Dowel makes it easier to confirm the alignment in the mirror, thou.
The point I was trying to make was; it takes rather few N's to bend the shaft, hence the huge amount of N's produced by CF will bend the saft and in-line grip and sweet spot.
Reading your things clicking post made me realize you can trace any Straight ..... Line. The operative word is Straight.
Good to hear you are making things click. I'm still waiting on my 2005 epiphany deliveries.
I can easily align sweetspot with handle - w/ dowel or w/o dowel. Dowel makes it easier to confirm the alignment in the mirror, thou.
The point I was trying to make was; it takes rather few N's to bend the shaft, hence the huge amount of N's produced by CF will bend the saft and in-line grip and sweet spot.
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.
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.
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.
Vaako
Vaako -
For shaft info, the two forums I frequent are the Tom Wishon forum and a Yahoo group called SpineTalkers. Lots of discussion about droop, lead, FLO, etc. Wishon also will have a clubmaker fitting book coming out in a couple of months that is supposed to cover shaft dynamics in some detail.
For shaft info, the two forums I frequent are the Tom Wishon forum and a Yahoo group called SpineTalkers. Lots of discussion about droop, lead, FLO, etc. Wishon also will have a clubmaker fitting book coming out in a couple of months that is supposed to cover shaft dynamics in some detail.
Hybrid Mode
