Author Topic: Knotted string  (Read 3261 times)

0 Members and 1 Guest are viewing this topic.

Offline Jim Davis

  • Member
  • Posts: 1,352
  • Reparrows
    • Reparrows
Re: Knotted string
« Reply #15 on: May 12, 2016, 10:05:43 am »
Asharrow,
                  He mentioned a string, a bow stringer and a tillering string, so we are all on topic sir...
                                                                                                                                                  Don

Right you are. I guess it seemed to me that he wanted most to know if his stringer was safe to use.
Jim Davis

Kentucky--formerly Maine

Offline Onebowonder

  • Member
  • Posts: 1,495
Re: Knotted string
« Reply #16 on: May 12, 2016, 11:41:03 am »
Isn't a bow under the most stress while at brace?

NO, I'm pretty certain that there is considerably greater stress on a bow while at FULL DRAW.

OneBow

Offline PEARL DRUMS

  • Member
  • Posts: 14,079
  • }}}--CK-->
Re: Knotted string
« Reply #17 on: May 12, 2016, 11:42:05 am »
The string is under the most stress at brace while the limbs are at the most stress at full draw.
Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.

Offline Onebowonder

  • Member
  • Posts: 1,495
Re: Knotted string
« Reply #18 on: May 12, 2016, 12:38:52 pm »
The string is under the most stress at brace while the limbs are at the most stress at full draw.
 

HELP!  I don't get the physics of that idea.  A bow's limbs and the string attaching them seem like a closed system to me.  If there is increased stress on the limbs, that stress has to be equivalent on the high tension string connecting them.  ...am I missing something fundamental here?  ...are you being funny maybe and I'm too dull to get the joke?  I'm getting more coffee! ??? ??? ???

OneBow

Offline DC

  • Member
  • Posts: 10,396
Re: Knotted string
« Reply #19 on: May 12, 2016, 12:53:36 pm »
I don't understand it clearly but I have measured it. On a 40# bow the string is under about 43# at brace and then drops off steadily to 40# at full draw. It's really bizarre to watch the scale drop as you draw the bow. The lower the brace height the higher the string tension is. At least until the scale ran into the bow, that's when I stopped.

Offline JoJoDapyro

  • Member
  • Posts: 2,504
  • Subscription Number PM109294
Re: Knotted string
« Reply #20 on: May 12, 2016, 02:24:14 pm »
The string is under the most stress at brace while the limbs are at the most stress at full draw.

That is what I meant.  >:D
If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline joachimM

  • Member
  • Posts: 675
  • Good - better - broken
Re: Knotted string
« Reply #21 on: May 12, 2016, 05:48:07 pm »

HELP!  I don't get the physics of that idea.

OneBow


Smartphones are not ideal to explain this, but IMO it comes down to string^tip angle increasing during the draw, and the resultant force on the string decreasing because of that. When a string breaks, it happens at the end of the return to draw when an arrow has been shot, most of the time.