Author Topic: Understanding Dynamic Arrow Spine  (Read 2976 times)

0 Members and 1 Guest are viewing this topic.

Offline Scyth

  • Member
  • Posts: 74
Understanding Dynamic Arrow Spine
« on: February 24, 2019, 11:00:33 am »
Understanding  Dynamic  Arrow Spine by Paul Fender

https://ohlonearchery.com/understanding-dynamic-arrow-spine-characteristics/

. . . I knew there was a good reason about building (the pain in “gluteus maximus”) double tapered arrow shaft . . .


regards,

Scyth
« Last Edit: February 24, 2019, 11:03:39 am by Scyth »
"Retirement is not a word in the dictionary of craftsmen
and I will carry on my work a long as I can . . . "

- Yang Fuxi

Offline DC

  • Member
  • Posts: 10,396
Re: Understanding Dynamic Arrow Spine
« Reply #1 on: February 24, 2019, 11:47:52 am »
Interesting Scyth, thanks for that :)

Offline TSA

  • Member
  • Posts: 272
    • www.trueshaftarchery.com
Re: Understanding Dynamic Arrow Spine
« Reply #2 on: February 25, 2019, 10:05:31 am »
thanks for that!! :OK

Offline DC

  • Member
  • Posts: 10,396
Re: Understanding Dynamic Arrow Spine
« Reply #3 on: February 25, 2019, 10:14:14 am »
Makes you wonder if tapering in steps might set up even more waves and dampen even better.

Offline Scyth

  • Member
  • Posts: 74
Re: Understanding Dynamic Arrow Spine
« Reply #4 on: February 25, 2019, 10:51:45 am »
DC -

I’m looking for the references on the “ideal” locations of nodes on bamboo shafts : numbers of nodes, spacing along the shafts, etc.

. . . for same purposes as “tapering in steps” . . .

regards,

Scyth
« Last Edit: February 25, 2019, 11:08:31 am by Scyth »
"Retirement is not a word in the dictionary of craftsmen
and I will carry on my work a long as I can . . . "

- Yang Fuxi

Offline willie

  • Member
  • Posts: 3,231
Re: Understanding Dynamic Arrow Spine
« Reply #5 on: February 27, 2019, 05:28:13 pm »
interesting read

the physics presented about vibration and dampening seem right, but I don't know if his actual test method will yield pertinent results for arrow evaluation

 clamping the arrow at one end might be a different situation than an arrow in free flight that would flex at its "nodes"

see           
Code: [Select]
http://www.bow-international.com/features/technique/flex-in-free-flight/
when considering a single taper bamboo arrow, I wonder if you would consider the possibility of changing the weight distribution along the arrow to make it "tune" different? add external weights along the shaft for testing? and maybe add inject? internal weight on the finished models

coming up with a way to evaluate the vibes in a free flying shaft would be the challenge
also, if there is a rotation of the flexing arrow, vibrations can be affected and possibly dampened to an advantage?

« Last Edit: February 27, 2019, 05:33:13 pm by willie »