Something Technical about Shafts today

There is more to the Golf Shaft then the Stiffness Rating, Weight and Torque. So I really need to go into this further. Why the sudden confusion? This is because of the many opinions said about things on the net. But usually one takes information found on the net and give it a 50% discount. But what really set this off was when I took my wife's driver and hit it on the range. And it gave surprising results. Hit it about 200-210 metres pure carry(range ball), but the ball was sky high with loads of backspin as her driver was 12 degree loft. And with a higher loft, lighter weight and Ladies flex, one gets more back spin. However, the shaft felt very stable and not much twisting. But looking at the shafts specs, I am supposed to be blowing it right. The weight of the shaft was 39g, the torque was 6.6 degrees. As opposed to the 75g and 2.6 degrees of torque which I use.

Oh, my wife's driver is the Ping Faith Driver 12 degrees with the Tour AD TFC 550.

  

So there are other things to consider:

1. EI - This is a product of the elasticity and moment of inertia of the shaft. Was listed as 13.497 average for the TFC 550. Basically it tells flex profile of the shaft. There usually is a curve to identify the flex at different points of the curve. The reason for being so technical is that one shaft's S or R flex is different from another shafts S or R flex. And if you had the EI curve and the flexural profile graph, you would have a better idea which shaft fits you.

Look at the oft compared KBS, Project X and Dynamic Gold shafts.(from GolfWrx.com/ Sandtrap.com - great forums)

2 GJ profile- Basically its like the EI profile but measures torque instead. For the TFC 550 it was 5.76 average

3 Stiffness Ratio 57% was listed on the shaft

4. Flex 5.92"

Not sure what 3 and 4 are about. Anybody care to fill me in?

So many things to consider. Fitting in Singapore isn't exactly wonderful either. So have to go do alot more research. Fitting and demo days are more like putting in various shafts which the fitting cart has till they find  the best fit in their cart. But then the options are limited. Sigh.....