Author Topic: limb vibrations on R/D longbow  (Read 741 times)

Offline reini

  • Trad Bowhunter
  • **
  • Posts: 34
limb vibrations on R/D longbow
« on: October 08, 2019, 03:31:42 AM »
Hi guys,
having problems with the latest laminated longbow i built.

I've already built many bows, but this one is the first one showing vibrating limbs.
After shooting an arrow, both limbs are doing strong vibrations for about 3-5 seconds.
It's not a handshock, just these vibrations in both limbs.
Varying the brace height didn't change much.
The tiller i think, is ok too.

Thinking about string material (BCY 8125G), but i'm always using the same and never had this problem on any other bow.

Any ideas out there on how to solve this problem?
Thx Reini
Timberpoint Odyssey II 43#@30"
Hunter's Niche Predator Hunter DX 38#@28"
Some self-made D/R Longbows

Online Crooked Stic

  • Trad Bowhunter
  • **
  • Posts: 4479
Re: limb vibrations on R/D longbow
« Reply #1 on: October 08, 2019, 07:19:00 AM »
Are the limbs bending the same all thru the draw.. In other words limb timing. both ends back to brace at the same time.
High on Archery.

Offline reini

  • Trad Bowhunter
  • **
  • Posts: 34
Re: limb vibrations on R/D longbow
« Reply #2 on: October 08, 2019, 07:43:58 AM »
Are the limbs bending the same all thru the draw.. In other words limb timing. both ends back to brace at the same time.

... yes they do, i've checked some positions on the tillerboard.
And there's almost no handshock, so limb timing should be ok.
It's just the strong vibrations on both limbs for a few seconds after the shot.

I can feel and see it vibrating, it's stronger at the end of the limbs, would say the outer halves.
And i think i can exclude the tips, they are really small and lightweight.

Thx Reini
Timberpoint Odyssey II 43#@30"
Hunter's Niche Predator Hunter DX 38#@28"
Some self-made D/R Longbows

Online Mad Max

  • Trad Bowhunter
  • **
  • Posts: 3752
Re: limb vibrations on R/D longbow
« Reply #3 on: October 08, 2019, 07:53:34 AM »
What # bow are you shooting and how heavy are the arrows?
I would rather fail at something above my means, than to succeed at something  beneath my means

Offline reini

  • Trad Bowhunter
  • **
  • Posts: 34
Re: limb vibrations on R/D longbow
« Reply #4 on: October 08, 2019, 08:03:32 AM »
What # bow are you shooting and how heavy are the arrows?

draw weight is 40#@30"
bow length 67",  R/D glass longbow
Arrows are at 10gpp
Timberpoint Odyssey II 43#@30"
Hunter's Niche Predator Hunter DX 38#@28"
Some self-made D/R Longbows

Online Mad Max

  • Trad Bowhunter
  • **
  • Posts: 3752
Re: limb vibrations on R/D longbow
« Reply #5 on: October 08, 2019, 08:30:20 AM »
I did a search and all I can find is to make a new string with something different.
I would rather fail at something above my means, than to succeed at something  beneath my means

Offline reini

  • Trad Bowhunter
  • **
  • Posts: 34
Re: limb vibrations on R/D longbow
« Reply #6 on: October 08, 2019, 08:59:53 AM »
I'll build a FF+ today and see if it's getting better.
Thx Reini
Timberpoint Odyssey II 43#@30"
Hunter's Niche Predator Hunter DX 38#@28"
Some self-made D/R Longbows

Offline Flem

  • Trad Bowhunter
  • **
  • Posts: 2082
  • "Don't quote me on that!"
Re: limb vibrations on R/D longbow
« Reply #7 on: October 08, 2019, 10:37:08 AM »
Can you post a video of the bow being shot?

Online Crooked Stic

  • Trad Bowhunter
  • **
  • Posts: 4479
Re: limb vibrations on R/D longbow
« Reply #8 on: October 08, 2019, 11:24:15 AM »
Yep try a low stretch string first.
High on Archery.

Offline Wolftrail

  • Trad Bowhunter
  • **
  • Posts: 1152
Re: limb vibrations on R/D longbow
« Reply #9 on: October 09, 2019, 08:03:24 PM »
Had a recurve that sung and shook like a stuck goat,  changed the string from endless loop FF to a Flemish and also installed furries on the strings.  Reduced the noise by 85%.

Offline reini

  • Trad Bowhunter
  • **
  • Posts: 34
Re: limb vibrations on R/D longbow
« Reply #10 on: October 10, 2019, 01:09:17 AM »
So, put on a FF+ with silencers and it's MUCH better now.
But it's not gone, still annoying.
Just wondering what the reason is, to avoid it in the future ....

Thx Reini
Timberpoint Odyssey II 43#@30"
Hunter's Niche Predator Hunter DX 38#@28"
Some self-made D/R Longbows

Online Crooked Stic

  • Trad Bowhunter
  • **
  • Posts: 4479
Re: limb vibrations on R/D longbow
« Reply #11 on: October 10, 2019, 05:13:14 AM »
May take about 100 arrows for the string to settle in good if you did not stretch it first.
High on Archery.

Online Mad Max

  • Trad Bowhunter
  • **
  • Posts: 3752
Re: limb vibrations on R/D longbow
« Reply #12 on: October 10, 2019, 06:40:55 AM »
Move the nock up or down on the string and shoot some
I would rather fail at something above my means, than to succeed at something  beneath my means

Online Mad Max

  • Trad Bowhunter
  • **
  • Posts: 3752
Re: limb vibrations on R/D longbow
« Reply #13 on: October 11, 2019, 08:45:42 AM »
Maybe it needs a little tillering on one limb :dunno:
« Last Edit: October 11, 2019, 05:12:15 PM by Mad Max »
I would rather fail at something above my means, than to succeed at something  beneath my means

Users currently browsing this topic:

0 Members and 1 Guest are viewing this topic.
 

Contact Us | Trad Gang.com © | User Agreement

Copyright 2003 thru 2020 ~ Trad Gang.com ©