RE: 2 Vanes, 1 Feather?
John,
I made the mistake once of shooting an arrow with no fletch and a broadhead attached- found it in the yard weeds of a house I had recently moved into. I have never seen an arrow dip and dive like that then hang a hard right to bury itself in the neighbours fence. It was fired at a target that was about 20yds away, ended up going about 40 in directions it never should have.
First, last, and only time I tried that experiment!
RC ( bh was a rusty old zwickey on an aluminum shaft)