Main Discussion Area > English Warbow
Heavyweight arrow shafts
CraigMBeckett:
--- Quote ---I've been building my own 3/8" poplar arrows at 33" and thought I was on the right track until I built my spine tester. The tester shows a spine of around 40lbs?? This goes along with the problem of all my arrows shooting far to the left (I shoot right handed) which I thought indicated too heavy a spine (my longbow is 80lbs).... just adds to my confusion.
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Arrows shooting to the left are generally a sign of too stiff a shaft. I would suggest your 40lb spine for a 3/8 poplar shaft is wrong or the wood is very poor. Most arrows found on the Mary Rose were of Poplar, admittedly the shafts were 1/2 inch. In addition most heavy shafts sold for the Warbow market in the UK are also of poplar, 3/8th are said to be good for bows up to 100 lb or so 1/2 inch for heavier bows.
So either find better poplar, make your arrows out of the wood Erik suggests or fix or replace your spine tester.
I use a version of 2jays spine tester see http://bambooarrow.com/tester.html and found it to be accurate.
I have looked at some of the others offered throughout the net and found problems with their scales etc.
Craig.
adb:
If you're shooting a warbow, which is basically heavy arrow flight shooting, then precise shaft spine is not too important. I don't target shoot my warbows at all.
You're much better off concentrating on building finished arrows with matched weight. Check out the EWBS website for arrow specs. I'm 100% sure that medieval fletchers didn't spine test arrows.
JustinNC:
Let me check. I may have some sourwood at home that fit ur needs. I gotta double check tonight.
bumppo:
Found this online, but still have some questions: "The accepted standard for measuring spine is to measure the deflection of the shaft at the midpoint of a 26 inch span when placed under a two pound load." http://www.jamesmhill.com/Spine_Tester.html
Doing this with my 3/8" poplar shafts give me a spine of around 90lbs. my 7/16" poplar are around 125lb, the 1/2" at around 170lbs. Measuring the same shafts at 33" gives me spines of between 40lbs and 120lbs. How would I describe the spine weights of these 33" shafts? Is it customary to use the spine weights measured at 26" or at the full length of the arrow shaft?
I've shot a bunch of un-fletched shafts with a variety of spines and found a weight that seems to work OK for me. Don't think I need a better spine tester, just an understanding of how other people describe the relative stiffness of their arrow shafts.
adb:
--- Quote from: bumppo on October 31, 2010, 02:51:42 am ---Found this online, but still have some questions: "The accepted standard for measuring spine is to measure the deflection of the shaft at the midpoint of a 26 inch span when placed under a two pound load." http://www.jamesmhill.com/Spine_Tester.html
Doing this with my 3/8" poplar shafts give me a spine of around 90lbs. my 7/16" poplar are around 125lb, the 1/2" at around 170lbs. Measuring the same shafts at 33" gives me spines of between 40lbs and 120lbs. How would I describe the spine weights of these 33" shafts? Is it customary to use the spine weights measured at 26" or at the full length of the arrow shaft?
I've shot a bunch of un-fletched shafts with a variety of spines and found a weight that seems to work OK for me. Don't think I need a better spine tester, just an understanding of how other people describe the relative stiffness of their arrow shafts.
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Once again, I'll ask you... what is your purpose in measuring spine of heavy war arrows?
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