Bamboo arrow spine (Page 1 of 2)

Hmmm...  I'm guessing they are breaking at the node, which ends up being weak, due to each chamber having to be pierced to let steam out during the heat treating process.  Where were they made?

To get directly to your question, 55-65# arrows shouldn't be breaking.  Also, bamboo arrows tend to be very spine forgiving in comparison to carbon or wood; I regularly shot 70# spine bamboos from 50# bows with no problems whatsoever.  Also, keep in mind that, with a thumb ring, you are shooting about 3" more than with fingers, so if the arrows are spined at a certain weight, it was probably also at 28" (not 31").

I've used Tiger shafts, they are ok but are mass produced therefore quality from shaft to shaft can vary ... a lot. Same thing goes for the weight. He has followed the 'spine' direction, I think he'd be better off selling shafts by weight.
He does tend to indulge in self gratification, constantly endorsing his methods. However my own experience is they are brittle and prone to damage.

At 12m I'd guess the arrow has not righted itself enough and is hitting the target at an angle and the whiplash effect is snapping the shaft. This is what happened when I shot a close target.

Check each shaft very carefully, looking for signs of fracture or other potential problem. I've found some with longitudinal splits between the fibres and others with stress fractures. Anyone who has prepared bamboo shafts for arrows will recognise these fractures as areas that fail during straightening.

So, these shafts are ok but do check them thoroughly.

What about bamboo shafts from Korea? I read that they are the best one can find... Anyway shipping cost to France might be prohibitive, as well as Jaap Koppedrayer's I fear...

Just received new bamboo shafts with spine 75-80#!

I switched to 11/32 arrow points to fit larger diameter of the shaft. Those points are 120 gr instead of 100 gr on my former arrows.

New arrows hit the target with no angle, but 10 cm to the right, due to higher spine I guess. So far so good, I didn't break today

Not that fast I was refering to shafts I ordered 2 weeks ago from my ebay supplier in UK. These are not marked "Tiger", allthough.

If I order shafts from Jaap, which may happen when I'm fixed with the spine I need, I will post some pictures.

Yes they are.

I ordered two dozens high spine bamboo shafts from Mark last year.  They didn't come with Tiger's marks though.

Things are much better now, the 75-80# shafts never breack when hitting the target, whatever distance.
I also noticed that the thread wrapped at the end of the rachis would worn more slowly than with former shaft.

Spine 75-80# is ok for a 45# bow with thumb release.

Still, I want to try some higher spines (80-85#, 85-90#), this is in my 2013 todo list 

Second attachment

That's very nice, Olivier!      Did you use the Vario feather chopper to shape the feather?  Are those Top Hat field points?

Thanks! I made my own feather burner. Home made feather burners are another topic ...

You are right, I use Tophat points, they are simply twisted on the shaft (no glue).
http://www.tophatarchery.com/

Olivier

Just got some 100 cm shafts from oulay bamboo today.
They came very straight, polished and spine rated.
I will try them very soon.