See the video " how fletching spin direction impacts single bevel rotation on impact" by Ron Kulas. Ron is an engineer, a member of the Wisconsin Traditional Archers, and has done quite a lot for this sport.
I don't know how to attach it for others, maybe someone ( Deno ?) could ?
Very interesting results.
Have a real good friend who uses right bevel heads because of ease in sharpening(he is right handed) and left wing helical fletching. His animals are just as dead as with left bevel(harder to sharpen). He uses a file for most of the sharpening.
Steve...you are always looking for the easy way !😉😇
Ashby addressed this question in his research as well. He came to the same conclusion. It's nice when independent researchers come to the same conclusion, and when that conclusion supports common sense.
One of the advantages of the single bevel edge is that it induces a splitting force into bone as it passes through. This splitting force is negated if the arrow's rotational momentum is opposite to the torsion induced by the single bevel head.
You can screw a screw into wood by turning it counter-clockwise, if you apply enough force. But it sure is easier to screw it in clockwise. eh?
Great video Chuck. Lots of good info. Answered alot of questions for me.
Thanks for posting Rick.
I wondered about this subject since I saw it recommended to match the feather wing to bevel. I believe I first saw it in an add for a single bevel head but can’t recall who’s. Seeing is believing, one reason I like vidoes
I ponder why do you need the spin anyway
a slice through is a slice through
and doubt the spinning torque would really be much of a factor in bone splitting over just a wedge going through like a wood splitting maul?
don't think the arrow rotation would have much force associeated with it ,not like the foward momentum???
Very well done. He didn't say what he was using to propel the arrows. If not using a shooting machine, that could introduce some variability. I suspect he was using a compund and a trigger, which would yield pretty consistent force to the arrow. I also assumed the heads were of the same sharpness.
Regardless, like Ron, I also always felt that fletching and bevel should be matched. And, though the difference doesn't seem terribly large, now we have some pretty good data to support it. A few more tests/shots would strengthen the findings.
What surprises me most is how little the bevel continues to spin after it hits. I expected either might make several revolutions during it's time in the target/critter, instead of a half revolution or less. I bet that's pretty similar to a double bevel head.
Great video thanks for sharing
Happy to do it, Chuck. Thanks for directing us to it. It's always nice to have definitive answers.
Thanks for posting that Mr Green !
Very interesting. I've wondered about this for years, and have fetched a lot of arrows with RW feathers because that's what conventional wisdom told us to do. But I always wondered if it really matters. Great info. Thanks, Chuck (and Ron).