I dont a test a few years ago 5" feathers against 5" vanes.

out of the bow the feathers where faster and where faster up to about the 38 yard mark.

After that the vanes where faster than the feathers I could not complete the test after 50 yards due to a brain fart and I got a perfect heart double lung on my crono

I do have the exact figures written down some where I will see if I can find them and post them.