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Author Topic: Hysteresis Reports  (Read 1545 times)

Offline konrad

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Hysteresis Reports
« on: May 09, 2010, 08:44:31 PM »
Hello Folks,

I told you I would report back when I received answers from all the manufacturers regarding my hysteresis question.
Many factories had no facility for submitting an e-mail question (i.e. Mathews). Other factories did not answer at all (i.e. Bear Archery)

Frankly, I was surprised by both the responses and the lack of response to what I felt was a fair question.
Find below the direct quotes from the two engineering departments that did respond.

My thanks go out to Martin Archery and Hoyt Archery, both of whom replied promptly. I was hoping for additional communication but was disappointed.








Konrad,
Thanks for the inquiry. Here is a response that I received from our engineering manager:
 
The change in efficiency of the limbs is minor when compared to the other variables of the system.  We typically run a test where we cycle (draw, let-down, repeat) a bow system for 30,000 times in a 12 hour period.  This creates “significant” thermal conditions in the entire system (not just limbs).  The system is then tested and the efficiencies are minimal when comparing to impact points of shot arrows.  Typically the system will lose about ˝% after this grueling test is run and the effects on accuracy require a shooting machine to measure at 60 yds. 
 
I know that this answer is a bit short compared to the length of your inquiry but I hope that it helps answer some of your question.
Please let me know if you have further questions.
Regards
~Tom
Hoyt CS Team
===============================================================
Hysteresis is something that can be measured, but it doesn't seem to change very much if a bow is fired at a high rate, vs. a lower rate.

I personally do not believe that hysteresis accounts for a very high percentage of the wasted energy released during the shot.

I think the overwhelming majority of energy loss, is due to the limbs having to move so much "stuff" that doesn't leave with the arrow. The string, cables, cams and limbs, all possess mass, that must be moved. High speed video shows how much kinetic energy remains in the bow following the shot.

As archers, we feel and hear it as vibration following the shot. If we use a heavier arrow, the ratio of arrow-to-allthatotherstuff mass, is improved and the efficiency of the bow is increased. As a result, less energy is left over to make everything "bounce around" and the bow will be quieter as well.
***************


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All the best,
Martin Tech Forum
“The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter can not be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles.”

Col. Jeff Cooper

Offline xXx Archery

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Re: Hysteresis Reports
« Reply #1 on: May 09, 2010, 10:18:07 PM »
Why dont you send the e-mail to Gordon Glass and Barnsdale limbs the guys who make limbs for most of the bow co.
hoyt and martin do there own limbs.
Co-Owner of xXx Archery and Maker of xXx G-Strings

Offline Matt

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Re: Hysteresis Reports
« Reply #2 on: May 10, 2010, 07:22:39 AM »
They all use Gordon glass blanks.  That is right from Dave Barnsdale.  What they do with those is up to the mfgr.  The answers will be the same though.  Very little effect and probably none noticable from our perspective.
USN Ret. Chief
Bow Only

Offline halflife65

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Re: Hysteresis Reports
« Reply #3 on: May 18, 2010, 09:46:13 PM »
WTF is hysteresis?  Will anti-biotics cure it?  Diagnosis doesn't involve a cotton swab, does it?

Offline addicted

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Re: Hysteresis Reports
« Reply #4 on: May 20, 2010, 08:21:50 AM »
WTF is hysteresis?  Will anti-biotics cure it?  Diagnosis doesn't involve a cotton swab, does it?

dont go dipping your wick where it doesnt belong and you'll never have to know. lol
"Right now, I am thinking that If my grandmother was here, she would be lecturing me about how there are poor people in Africa, that would just love to have a Ruger, I would just say "Great, granny, lets just ship all the Rugers to Africa!"


Loving life in the Great Northwest one day at a time.

It sounds like it's time to get a new gun.

 


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