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What weight is considered a heavy arrow

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burchett.donald:
   Thanks Knoll, interesting read...As a hunter you learn to appreciate the heavier side...Kinetic energy along with perfect flight is the key for penetration...

Knoll:

Yes, achieving great arrow flight is so so important.
Thanks to Dr Ashby's work, I've been persuaded that it's momentum at impact point, rather than kinetic energy at bow, that is determinant re penetration.
And recent work by Ranch Fairy (YT contributor and member of Ashby Foundation) has shown that kinetic energy out of the bow are closely grouped within wide range of arrow weights . . . but momentum at point of impact is widely dispersed from lightweight (less) to heavy (more) arrows.

burchett.donald:
       Knoll, I have sat an thought many times on the impact down range...There is a perfect weight combination for each bow / arrow set up where the weight of the shaft doesn't impede the bows performance to push and become to sluggish...That is if one can find that "magic number"..I ran a few tests years ago changing point weight and measuring penetration on a new soft block type target. My findings at the time with my set up @ 57 lbs. was that the upper 600's gave me the deepest penetration @ 15 yds...That was just some back yard stuff and not real scientific...There are so many variables that come into play that I could go bonkers...I even found myself at one point carrying a small snuff can of lard to dip and coat the tips of my stone points in to keep the entry slick...Stone, pitch and sinew are not naturally slick against wet, sticky/bloody, hairy and flexible animal hides...I have found through bow hunting well over thirty years with  compounds, trad and then what I would consider Abo, that the heavy shaft gives you more "momentum of impact" down range agreed...
       It would be interesting to see maybe a chart where someone has tested a wide range of different weight shafts penetration from a given weight bow to determine best penetration from a given yardage...That would take some work, so many variables to consider...Perfect flight is a must...Bare shafting is key for me to achieve great flight

  Thanks again for the link to Dr. Ashby's work...
                                                                                                                                                             Don

Knoll:
Donald, many of your conclusions are the same as Dr Ashby. And he (and his colleagues) had the advantage of being able to carefully study literally hundreds of fresh kills.   :OK   
And, unlike me  :), Ashby had the knowledge of physics to explain the "whys".

BowEd:
With an efficient 45# bow 550 to 650 grained perfect flying arrow shafts sharpened to a razors edge flying 165 to 170 fps. the deer does'nt have a chance [an elk either] if it's put in the sweet spot.If I had a choice between using a 10 grain arrow or a 12 to 13 grain arrow I'd use the heavier every time for hunting.10 grain arrows off a 50# bow are considered target shooting arrows by me.
Dr. Ashbys' findings are sound as brick of gold.Many including me have adopted his findings.
Perfect for us under 20 yard shooting hunters.
Another benefit is that most hunting type bows if over built a tad become more efficient shooting heavier arrows.
When deer hunting it's all about putting the odds in your favor in every catagory of hunting.

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