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Bamboo arrows fatiguing?

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gutpile:
cane and boo won't fatigue might increase as they fully dry ,check the spine on the weaker arrows by rotating the arrow to opposite side.. cane and boo can vary spine depending on side you test.. weird but true.. gut

Allyn T:
Here is a quote from Khan's arrows website, "Here is the answer.  They DON’T change spines over time if stored under reasonable conditions.  What is happening is that because most static spine testers are not very accurate with measuring the shaft of an arrow with skin waves and irregularities, they will give you a different reading.  There is quite an art to measuring the static spine of bamboo shafts accurately"

gutpile:
how many Indians had spine testers.. really ?.. think about it.. cane and boo are very easy to hand spine once you get an arrow flying right... not to mention both are IMO tolerable to spine ranges.. my cane can fly well at spines from 55 to 70 and even above.. ... gut

Todd Mathis:

--- Quote from: Tommy D on April 13, 2021, 12:54:21 pm ---Well I had a set made for me that were supposed to be spine matched and over time I felt some arrows were flying differently so I checked their spine on my home made spine tester and there is quite a wide range!

--- End quote ---
I have bamboo arrows which have lasted for nearly 15 years...perhaps a few are even older.  I've never seen any spine test fluctuations, but there are several reason why you may be seeing this.
1-My first suspicion is that you are a better shot now, and so when some aren't grouping as they should, it is catching your attention.  If this is the case, and it actually was something I went through twenty years ago...congrats! 
2-My GREATEST suspicion is that most static spine testers simply don't work well with bamboo.  On bamboo arrow university, I put this up some months ago.  It gets a lot of traffic, maybe it will help...
https://khansarrows.com/best-way-to-measure-the-static-spine-of-a-bamboo-arrow/
Skin fluctuations, spine testers which don't allow for the other irregularities, and shafts which aren't quite round can cause issues.
3-I only know Tonkin River Bamboo.  If you are using river cane or others, I don't know enough to speak to that.  But if you are using Tonkin reed, and they are not perfectly straight, round, and with clean nodes, then you might upgrade the bamboo you are using...
If you learn something else, please let me know!  I'm always trying to inprove the knowledge base on bamboo arrow university...I'll owe you a beer!
Best regards.

Tommy D:
Thanks for all the feedback. I measure spine with a home made tester using a calliper and a 2 LB weight made of a coffee jar with rocks in it! I do zero it each time so I take out any wiggles and bumps from the bamboo. Have definitely noticed that it does have a wide range of spine tolerances and I am aware of how much form can affect arrow flight.

I do also agree that “Traditional People’s” certainly did no formal spine testing. I am also reasonable aware out of a mix match of arrows that I have how each one will fly ... but it was more a curiosity that a supposed “matched set” should have such great spine variation.

I will keep an eye on them and see if they change further.

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