Main Discussion Area > Flight Bows
Flight Arrows
DC:
--- Quote from: mmattockx on October 10, 2020, 08:35:44 pm ---How do competitors test their arrows without breaking them? Only flight shoot them in an open field or use a backstop of loose straw or what?
Mark
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I'm assuming so. Once you find the approximate spine so the arrow(and you) will survive the launch the rest seems to be aerodynamic so you need the long flight anyway. And the arrow that broke did survive being shot into a conventional target at 8-10 yards a half dozen times. The target bag in my shop is just too close at 7'. It's a burlap bag filled with plastic bags and old blankets that is free to swing from the ceiling. At Willie's suggestion I'm going to change the blankets for more plastic bags(the recycle bin is full of them) and that will make it lighter.
DC:
--- Quote from: willie on October 10, 2020, 09:28:00 pm ---Mark
http://www.primitivearcher.com/smf/index.php?topic=57378.0
--- Quote ---so I sanded one of them down. Tested it again and it looked better so I sanded more and this time it flew straight all the way to the target. I moved back to 15 yds and it was fine there. I measured the spine and it was 35#. There is no tip weight. Now it weighs 290 grains,
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Don, did you reduce the spine by sanding at the center third? before or after any barrelling?
in a nutshell, if you want to reduce spine, remove materiel in the center third, if you want to remove mass, reduce the outer thirds.
that said, if you barrel a parallel shaft with a known spine, it will static test less when you get done barreling, but the dynamic spine may not be reduced as much as the static test would indicate. Typically, the static testing charts assumes a parallel shaft.
you can certainly use static testing on barreled shafts for your own estimation purposes.
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Yes :D
DC:
--- Quote from: bownarra on October 11, 2020, 01:27:42 am ---You should be going a lot thinner on the front end. :)
Read this - http://www.turkishculture.org/lifestyles/turkish-culture-portal/turkish-flight-arrows-554.htm
Try making some shafts that copy the dimensions.
In Saracen Archery there is a short section about a flight arrows made with 3? different materials. Strong dense center section and lighter ends.
I think that stuff about the X10's softer rear section is marketing :) Have you seen the price of those suckers! I'd rather make my own haha.
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I just found and bookmarked that site yesterday. I have a piece of aircraft Spruce ready to go. The measurements given are for a 25" arrow. If I want a 28" arrow should I just multiply each dimension by 1.12(28 divided by 25). I'm concerned that will make the spine and arrow too heavy. I could reduce it from there though but that may mess up the aerodynamics.
For no particular reason I was pleased with the performance of the three piece arrow. I will try it again. Maybe with something a little lighter in the middle. Do you have a link to the info about them? One of the neat things about this sport is thinking you've come up with something new and finding out it was tried hundreds of years ago. I really think that other than new materials, everything has been tried.
willie:
--- Quote from: DC on October 11, 2020, 11:39:38 am --- I really think that other than new materials, everything has been tried.
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but old ways of doing things escape us.
I am curious about different ways to test flight arrows for their needed qualities. Is a three point deflection test as is commonly used for most arrows, the best way to evaluate flight arrows? Does anyone use a cantilever bend test on half the arrow? or a column buckling (compression) or other kind of test ?
https://pgmagirlscouts.files.wordpress.com/2012/10/saracen_archery.pdf
DC:
The column buckling seems to me to be the test that would most duplicate the situation but for a couple of things. If the arrow is even slightly bend it's going to buckle that way. Also the ends of the arrow would have to be precisely square for the test. If pointed, the point would have to be dead center. We used to very slightly angle the bottom of the masts on our model sailboats to induce a forward bend when we tightened the stays. The masts were 5' long and 1/2" dia and just knocking one side off a bit with a file would cause the mast to bend forward. If you wanted the mast to stay straight it had to be turned on a lathe. It was a very sensitive part of setting up a boat.
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