I think the spiral cut gives the vane some sort of angle or built in helical even if you stick them on straight.Thinking more about spiral cut vs straight cut on the straw... Spiral cut gives potentially wider material (although material width from straight cut looks adequate). However, spiral cut would also give a gentler curvature (less tight curl) than straight cut, which may be important in imitating the 'curliness' of commercial vanes. If this is true, and assuming curliness is an important parameter, I imagine that getting consistent
curliness from vane to vane is probably more difficult than getting consistent shape.
The pitch does look wrong though. It might just be the camera angle. I’d try moving the tip tape further up the fletch to get the front to lay down proportionately more than the tail end. Will give it more of a helical pitch.Attempt #2
Added longer tip and tails to the design so that wrap catches more of the wing.. Came out great this will probably be the design I use to test how it compares to store bought spin wings.
The other option is when you put them on to adhere them at a slight offset. The way the normal skin wings come they have a bit of natural curl to them which gives some of the pitch. Kudos on the innovative and environmentally friendly archery hack.I moved the tape up on the tip side of the vane and it did create a helical. Is this what you guys meant?