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FOC, center of pressure and performance

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Marc St Louis:
I made several flight arrows out of HHB many years ago, they were quite small in diameter.  I tried a carbon arrow to see if it would shoot farther than the HHB arrows, it did not.  My HHB arrows shot fairly consistently at around 330 yards and the carbon arrow fell at least 10 yards shy, consistently.

P.S.  Forgot to mention that the carbon arrow at about .25" was roughly the same diameter as the HHB arrows

avcase:
Marc,
Anything over 300 yards with a primitive bow is really good!  I wonder if the worse performance of the carbon arrow was mostly tuning related?  The carbon arrow should be a lot stiffer than the wood arrow if the diameter was close to the same. Those must be pretty impressive wood flight arrows to work so well at only 0.25" in diameter!

I believe my Sitka spruce arrows would really shine if I could keep them from rehydrating after heat treating them.

Alan

Tuomo:
Thank you for all the information, this is really interesting subject!

Alan - what do you mean saying "these have shot so well out of a such a large variety of bows". So, what kind of bows? Which poundage and draw length?

And why do you believe, your heat treated spruce arrows would shine without rehydration - because of lower mass or higher spine or some other reason?

Third question - why those two arrows are so special? Have you compared them to similar arrows, which are not so good? Is there any kind of measurable difference? You have made a lot of split cane arrows but what makes some of them special? Spine, weight, diameter, balance point, some parameter we don't know yet?

I am going to make some new flight arrows. My last batch was not so good... I have some POC shafts, 5/16", 63# and 400 grains (full length). I will get also some spruce shafts, which will be 5/16" and over 60#. Should be good raw material.

avcase:
I am not sure what traits I can isolate about these flight arrows that would explain why they have had such a long history of performing as well as they have. The only reason I even realized that these two arrows were repeatedly the best performers is that I started engrave each arrow with a unique serial number, and this serial number is registered at our flight tournaments and cross-referenced to the distances measured.

Here's a quick summary:
The larger arrow:
50lb & 70lb Modern Longbow record
50lb Primitive Simple composite record
50 pound Women's English Longbow records
35 pound Junior Woman's English Longbow record, which still exceed the adult men's & woman's 35 pound English Longbow records.
 
Shorter arrow:
50 pound men's Primitive self bow record
50 pound Women's primitive self bow record
35 pound primitive simple composite record
35 pound Modern Longbow record

Willie,
I hope you build some flight arrows and give it a try!  There is almost no end to it once you get started hahaha!  It seems like there is no end to the learning curve.

willie:
Thanks for the encouragement, Alan.

If I am reading what you said abut the longer arrow correctly, It broke a record in both a 75# class and a 35# class (and bested two other 35# classes with that shot)?

I would assume that many records are broken by shots that are only marginally longer than the previous record, but am curious how often a surprisingly exceptional shot occurs, a jaw dropper, so to speak.

I am suffering from some wishful thinking about what JNystrom was referring to earlier as the "glide effect".
There seems to be something that sets some arrows apart.

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