Arrow spine not making sense, to me

[BowEd]

last tip. when bareshafting- i finish up just a tad weak- as the fletching will stiffen the shaft a wee bit
I've noticed that too or is it that the feathers stabilize the shaft a bit quicker then shooting bare shaft.

[TSA]

this is something i want to test  soon, i want to test the theory that weight on the stern of the arrow will do the opposite of weight on the front.
there must aslo be a point of no return too!
but i think i am going to experiment with drilled in inserts in the nock- and see what i can find!

[TSA]

now to throw a cat amongst the pigeons:
put broadheads on, and they will tell a different story again

if the shafts are a bit stiff, the broadhead group will hit to the left of the field point group!!
so opposite of what bare shafts and field points do as a group!!

good luck fellas!!

[BowEd]

My way would be to drill a hole in the nock end 4" and insert soldering wire of 60 grains or so like lead.....lol.I've done that to bamboo on the front end to increase weight.I would think it would affect the flight some.Not recover as quickly or something like that.

[BowEd]

I always wondered why broadheads are supposed to make the shaft weaker even though they are the same weight.Suppose it's the air it catches.

[TSA]

thats exactly what i was thinking too!
i will try different weights, and and note the changes.
i think i will do the tests with a Glass( are we even allowed to say that here ) bow and a home built shooting machine- so that the draw and release is exactly the same.

[loon]

Wouldn't a center cut shelf change stuff considerably?

[TSA]

yup for sure, the centercut bow will require a stiffer shaft to perform properly, but the science stays the same.
i have found that the further from center the arrow pass is, the more specific a spine a bow needs to be properly tuned, and the closer to center, the wider range of spines a bow will shoot well with.