left helical jig
A few years back I read somewhere that the majority of right-handed bows will naturally spin an arrow counter-clockwise (can't remember where I saw this). This seemed odd to me as pretty much all factory arrows have a right helical. So I checked with a bare shaft and sure enough my bow naturally spins the arrows left (counter clockwise). I also happened to have a left helical for my bitzenburger so I fletched with a left helical. Since then, I've played around with fletch patterns (3 vs 4) and the amount of helical.
Did it help? Maybe a bit. I noticed the arrows look pretty much dead still in there air, whereas before it looked like they had just a touch of wobble on release. With a right helical, there would be a point where the arrow isn't spinning at all, likely right after release.
Left helical worth it? Those jigs last forever, so I'd say so. Although I probably wouldn't bother buying new broad heads that have a helical. Interesting idea though.
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