ORIGINAL: stealthycat II
Ed Ashby found that a helical fletched arrow will make one full 360 degree rotation every 60 inches in flight. But a single bevel broadhead will make the same 360 degree rotation in around 16 inches of tissue penetration.
If your fletching matches your single bevel (left wing fletch/LH bevel) then the rotation of the arrow and broadhead will actually increase speed on contact with the animal. The arrow speed in fps won't pick up but the speed of rotation will.
hmmm
1 rotation for every 5 feet .... that's only 12 rotations in 60 feet(20 yards) right ?
Why do we use anything more than 2-3" fletch then? I wouldn't think that little "spin" would stabilize anything ..
Interesting add to the topic though huh ?
I don't think it is "just the spin" that stabilizes the arrow. It is also the channeled air flow caused by the fletchings.
Edit: A straight fletch wouldn't cause a spin (theoretically), it just channels the air flow evenly, even air ppressure, around the cylindrical shaft.