Main Discussion Area > Flight Bows
Hysterisis and performance
Badger:
Pat, when I comes to flight shooting their really are prizes for the freshest bow of the day. The old bows you mentioned that must be loaded with hysterisis. Not so! That is the biggest place they had us beat! They definitely had it under control. You cannot get high dry fire speeds from bow with high hysterisis no matter how far you draw them.
PatM:
I disagree. You can see the pictures of the bows being drawn. They have to be in that zone.
One of the bows that set a record was crafted from a shortened broken York longbow. Hard to break a bow without stressing it to that point.
Some of the bows also shot record type distances for years or set records after being shot in damper conditions and then shot again in dry conditions.
These guys probably never heard the word.
scp:
First thing first. We need a graph of whatever that is being measured. Is it two-dimensional, three-dimensional, or even four-dimensinal?
Badger:
SCP, laying it out is where I feel like I failed. I was trying to condense it the best I could because it was too lengthy as it is. Each componet being measured requires almost a page of explanation.
Example. The first step is measuring the force draw curve of the bow. We all do this the same way. The fact is that if a bow with no hysterisis or very low hysterisis is measured it is pretty accurate, but if a bow has hysterisis it is a false measurement because we can't measure a force draw fast enough to keep up with the hysterisis factor. So all we get is a measure of how much work we are doing, it has very little relation to how much potential energy we actually have. This is the starting point for all the testing so if we don't find a more accurate method here everything downhill from this measurement is junk. Not having gone to school for any of this stuff I don't have the right terms to use. But starting at this point in the begaining if we don't identify the actual force going back into the arrow it will get lumped in with the virtual mass and thow everything else off.
Pat, the bows you are talking about doing so well are indeed low in hysterisis. The builder has no need to know anything about hysterisis if he knows what a good bow feels like. Successful flight shooters in the past were very aware of avoiding breaking down their bows. What I am talking about here in my thread is only useful for developing strategies to build bows, it just offers a way to prove certain theories that have been floating around for the past few hundred years.
The current record holding bows in the 50# class were all shooting in the high 220's maybe low 230's. We have bows now that are shooting in the high 250's and low 260's. Only because more attention was paid to hysterisis. Once I get the proper arrows to match thse bows I can back that claim up. The 50# records should all be over 400 yards , at present none of them are.
PatM:
I really doubt they coddled them like that. They shot them until they broke down to the point of not being competitive.
The goal was maximal distance, nothing else.
I think you mentioned the bow that you gave the girl which set a record was well shot in.
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