# Thread: How to measure shaft flexibility?

1. ## How to measure shaft flexibility?

Title more or less says what I want to know. Is there a way to measure racquet shafts flexibility accurately?

I tried to measure with a scale that is designed for scaling fish. I did it by mounting the scale to wall and then I put the racquet to the scale hook and bended it equally. I measured 6 different racquets but the result was the same with every racquet. difference between racquet were only 1 or 2 grams. I think there should be more difference between flexible and stiff shaft than just 1 gram

2. Static force deflection, or force required to achieve a certain amount of deflection? Although i don't get what would be the use of knowing the shaft's absolute flexibility. For the same absolute flexibility a head heavy racquet would appear more flexible than a head light racquet due to inertia.

I'm just happy to know i can bend a stiff shaft to a banana shape during a smash and flex my extra stiff racquet enough to warrent using it...

3. ## To measure Badminton Racket shaft flexibility

Originally Posted by Chief

Title more or less says what I want to know. Is there a way to measure racquet shafts flexibility accurately?

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4. Just add a few kilos onto the middle of the shaft and measure the number of degrees it bends. The more degrees it is the more flexible the shaft is.

5. ## This is the way

This is used on all Apacs badminton rackets

6. Apacs put the 20kg on the middle while SOTX put the 20kg on the T-joint.

7. Originally Posted by phandrew
Apacs put the 20kg on the middle while SOTX put the 20kg on the T-joint.
support at t-joint and cone = shaft flex test
support at top head and cone = racket flex test (flex including frame)
can i say like that?

8. Originally Posted by drifit
support at t-joint and cone = shaft flex test
support at top head and cone = racket flex test (flex including frame)
can i say like that?
I think it is before the frame so it doesn't include the flex of the frame. Obviously there will be more flex for SOTX because the disstance from the handle is about double the length of Apacs testing for flex.