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Bare shaft breakage

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DC:
Every time I try and make arrows out of Western Hemlock I break about half of them when I'm bare shafting them. I just broke one that was  3/8", 28" long, spined at 60#, barrelled and I was shooting it with a 40# bow. I thought I would start with a heavy spine since I was breaking so many. I would guess it hit about 3" nock right and broke flush to the target face. I was about 15' from the target. The log I made them from was green when I got it. It's been drying for about 1 -1 1/2 years in 2" x 3/8" blanks. This stuff has got to be stronger than Cedar so what do you think is going on?

Del the cat:
If an arrow hits the boss travelling at an angle, the front end can go in straight 'cos that's the direction of travel. the back end then caries on moving on a line that is say 3 inches to one side and snaps off where the shaft is held rigid in the boss.
I know people have explained why they bare shaft test, and I do understand... but I still think it's a bit daft.
I jokingly say it's like trying to tune the handling of your car by driving it without tyres  >:D
Del

DC:
How do people manage to bare shaft PO Cedar. I'm used to bamboo and have had no problem with it.

Knoll:
Bareshaft test regularly and broke maybe 2% of them. Cane, poc, poplar, sitka spruce, shoots, doug fir, etc..
I know roughly what shaft stiffness is going to work and begin testing with shafts whose static spine are somewhat less and which are longish.

DC:
What do you shoot in to?

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