Not sure if you are asking me to point out the helical vanes or not but if you are....The ones that I can see directly from behind look as they were fletched with a helical clamp.



If I set up an arrow in a jig with a right helical clamp and a 5" vane to get 100% of the base to contact the arrow and instead simply switch to 2" vanes is the helical any less?

No it isn't.

It is still fletched with the same jig, with the same right helical clamp on the same arrow.

Just because the vane is shorter does not change the degree that the vane wraps the arrow.