Howard, I'm sorry if this has already been addressed. I play KBS Tour X (no stepping) but +1/2". I've always wondered how does that extra length affect the profile, flex, etc.? Thank you.
We dont really change flex, not in such a way we should worry about it, since length is way more important to start with.
But, depending on what chart we use, ON THE PAPER we can sometimes see a difference to flex but did it really change?
Example we have a club thats 37.50 (standard #6 iron length) and that club measure xxx CPM on Kaufmanns chart for flex and thats "S"
Now we make the same club 0.5 inch longer, and SW value raise by 3 points, so CPM drops by 3.
On Kaufmanns chart, the flex slope is 7.3 CPM pr inch, or 3.65 CPM for each 0.5, so if the club only went down 3 equal to SW points, flex actually went stronger by 0.65 vs Kaufmanns chart.
If we use RIFLE FCM chart for irons post 2012, the CPM slope is 8.5 cpm pr inch, or 4.25 pr 0.5, and if the club only went down by 3 CPM, we actually went 1.25 CPM stronger...
BUT, the actual shaft, in your case a KBS TOUR, DONT have the same flex slope in its original design as either Kaufman or RIfles chart, so if we shall be able to judge it at all, we have to know the flex slope for the actual set. For a set like DG X100, we are close to 9 CPM pr inch, or close to 4.5 for each club both ways, so again, does it change MORE or LESS than SW value influence, VS the actual slope on that model, then we can put a number on it if we went stronger or weaker. in General, Shafts with a "stiff" butt goes stronger when we go longer, while a "soft" butt goes weaker.
Butt CPM ONLY, is ONLY good to judge 2 IDENTICAL shafts to se if the really are identical, not to compare 2 different shafts, and what ever number is shows, its not a value directly compatible with "feel" since we only measure a tiny bit of the shaft.
So where do we end up? maybe the flex value was 6.8 and became 6.92, or maybe 6.71, would you be able to notice?
If you was a robot, 1 CPM on flex would cause a flight with 1 feet higher apex and in your case maybe up to 0.5 yards, but i doubt you will see the same for the same reason. If ball flight changes, its a flatter swing plane and less negative AoA, and thats normal when we go longer.
Edited by Howard Jones, 17 October 2016 - 10:23 AM.