I have some that need new vanes. The blood eagles I got seems like they where running out of glue when they put the vanes on. Not sure with the rail if you can put a lot of helical twist in it. Seems like you would get contact. This spring I was gonna mess with it some. But my guess is the most you can add is a slight OS because of the rail. Wonder if a two vane configuration would fly... But the 3 works. So may not be worth changing.
From the videos Ive watched, Helicals will work fine in modern crossbows. The benefit of the helical is that it start spinning the bolt as soon as it leave the rail. Which gets the arrow stable faster. I would think that would be very beneficial to shooting closer ranges (30-40yards). To much spin can slow the bolt down at longer distances, but most guys arent taking 80yard shots while hunting.
I did just clock one of my bolts, and as luck would have it, it naturally turns clockwise. I purchased the Arizona EZ Fletch right helical and will use the 3.5in Bohning Bolt vanes. Ill put them on the 20in Carbon Express Piledriver bolts that have shed their vanes in target practice.
I will fletch the cock vane on the strong side of each bolt so they all come off the rail the exact same and nock tune if needed. If i had to guess, this alone will yield much better accuracy.
Ill compare the ones i build to a stock Piledriver with its stock strait vanes that has been nock tuned.
If anyone here is interested in the results let me know and ill post them here.
