Does adding a longer Butt End affect stick flex?

[Reaper 0]

If you take a 100 Flex shaft and add an 8 inch wood extension plug to it does it affect flex?

Does it make the stick flexier?

By what factor?

Thanks in advance.

[Squirrel 0]

yes it does

[Reaper 0]

yes it does

Care to be more specific?

[Miike 1]

The more you add to it, The whippier it would get basicly.

[Reaper 0]

So, would a 100 Flex be more like a 90 Flex with an 8 inch endplug?

[Chadd 916]

So, would a 100 Flex be more like a 90 Flex with an 8 inch endplug?

90 or slightly less I would say.

[furlanitalia 1]

The Rbk rep out here told me that for every inch you cut off a stick you add 4% stiffness, so i'd assume it would close to that for every inch you add.

8 inches x 4 (4% of 100) = 32. 100 - 32 = 68

or

if you recalculate for every inch you end up at about a 72 flex.

so ur stick is probably between 70-80 flex. (I'm guessing)

[sherwood21 0]

The Rbk rep out here told me that for every inch you cut off a stick you add 4% stiffness, so i'd assume it would close to that for every inch you add.

8 inches x 4 (4% of 100) = 32. 100 - 32 = 68

or

if you recalculate for every inch you end up at about a 72 flex.

so ur stick is probably between 70-80 flex. (I'm guessing)

Not a chance. Plus im pretty sure that Reaper weighs 260 or something around that so 68-70-80 would be pushing it ;)

[golfpuck 0]

if i put my years of experience in the golf industry to work, as well as dust off my engineering degree

length changed/original length(including hosel) x 100 = % change in flex "feel"

+8"/53.5" (standard easton shaft lenth+length of hosel) = 15% decrease in flex

so a 100 flex shaft lengthend 8" should feel like an 85 flex shaft

this assumes the hosel portion is the same stiffness as the shaft.

also assumes uniform flex, and does not account for flex points etc..

however since most shafts are low kick, the butt end of the shaft does not flex as much as the lower portion, of the stick, so i suspect it will be stiffer than this math points out. i suspect the real change to between the above calculation and 50%.

in the above case, 15%-7.5" change in total flex, so 85-92.5 flex

[Reaper 0]

The Rbk rep out here told me that for every inch you cut off a stick you add 4% stiffness, so i'd assume it would close to that for every inch you add.

8 inches x 4 (4% of 100) = 32.  100 - 32 = 68

or

if you recalculate for every inch you end up at about a 72 flex.

so ur stick is probably between 70-80 flex. (I'm guessing)

Not a chance. Plus im pretty sure that Reaper weighs 260 or something around that so 68-70-80 would be pushing it ;)

Actually, I'm about 285 so for me to use a stick that flexy would be great if I was going to do the Brett Hull thing. ;)

However, I'm not going to be doing that because I'm not nearly that finnese. I'm just an intimidating plugger. :D

[Reaper 0]

if i put my years of experience in the golf industry to work, as well as dust off my engineering degree

length changed/original length(including hosel) x 100 = % change in flex "feel"

+8"/53.5" (standard easton shaft lenth+length of hosel) = 15% decrease in flex

so a 100 flex shaft lengthend 8" should feel like an 85 flex shaft

this assumes the hosel portion is the same stiffness as the shaft.

also assumes uniform flex, and does not account for flex points etc..

however since most shafts are low kick, the butt end of the shaft does not flex as much as the lower portion, of the stick, so i suspect it will be stiffer than this math points out. i suspect the real change to between the above calculation and 50%.

in the above case, 15%-7.5" change in total flex, so 85-92.5 flex

Thanks for working all that out for me. I'm actually considering getting an Easton Ultra Lite and needed to know if I should get the 85 or the 100. It sounds like the 85 would be comical for me. So, I'll probably get the 100 as I'm more of a wrister guy anyways.

[furlanitalia 1]

Glad that could help. I figured it would be a little less then 4% anyway because the wood would flex more individually from the shaft, and it would most likely be more stiffer. But assuming 4% as the most it would be, it helped to get an idea of the new flex.

[mack 44]

I don't have a specific formula, but I use 120s and with a ~6" endplug they come down to about a 110-115.