Main Discussion Area > Flight Bows
Flight Arrows
mmattockx:
--- Quote from: DC on October 22, 2020, 12:04:16 pm ---I thought that the idea was that you can use a denser, stiffer wood and so reduce the diameter and end up with the same weight and spine in a skinnier package but it's looking like dimensions trump density. At least as far as stiffness is concerned.
--- End quote ---
Stiffness is proportional to the 4th power of the diameter, so it is vastly more influential than material. If you double the stiffness of your material (which is hard to do with wood) then the diameter only drops to 84% of the original diameter.
Mark
willie:
--- Quote ---the 4th power of the diameter
--- End quote ---
that seems decisive enough to just work with whatever Dfir, hemlock. spruce, larch or pine has a reasonably high stiffness:density ratio. one criteria might be how well your choice survives impacts. oven dried wood might be too brash in spite of stiffness gains. I think I read where different woods were tested for brashness/impact in the aircraft spruce alternative paper. Also some interesting comparisons at the end of the paper.
https://ntrs.nasa.gov/api/citations/19930091423/downloads/19930091423.pdf
Do the records in the class you wish to enter show any arrow specs? knowing more about the typical arrow may help you choose whether the lightest possible arrow is actually better than a heavier one that might carry further in spite of a lesser initial velocity.
DC:
I took a half dozen arrows to the field today. All my new low spine were too low spine. They came out of the bow sideways so 35# 28" no tips is too light. It's looking like 50# spine is what I need even with no tip weight. I had made 6 arrows all little different were and there and they all shot within a few yds of each other. No joy there.
What does a tail wind do to arrow flight? Mostly I'm wondering about the difference between heavy and light arrows. Like will a heavy arrow benefit more from a tail wind or vice versa.
I did shoot a PB at about 260 yds with a Hemlock 37# spine 312 grain arrow. The wind had changed to cross wind by then. I think it was just a 50# bow instead of a 40# bow.
Badger:
DC, at 260 yards you are still not getting good distance so I wouldn't use those arrows as a model. Anything under 300 yards you are not getting good flight. Your bow is fast enough to hit 400+yards with decent arrow flight.
DC:
Yeah, I was shooting against hunting bows and was only 20 yds past them. I was getting very poor launch I think. How much can the launch affect the distance? Somehow I just can't see anything that will get me out to 400 yds. Even if I changed a half dozen things that got me 10 yds each I'm still short.
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