Well guys it's like this. Any time you have a perferated object spinning in the air, you will have a certain amount of noise associated with it. We tried beveling the edges and that did not make any difference. They have been tested in 3 Rivers lab and do not make as much or even less noise as the originals. The only way to make them slightly quieter is to remove the rib between the two vents, but that would just create a weak spot for the blades to cave in. A little noise in a broadhead isn't going to make or break hitting your game seeing how your bow being shot is going to be the loudest part of the whole process. I think you will find that with this design, you will not need a whole lot of fletching to steer you arrow. A minimal amount of rotation equals a minimal amount of noise.
The only way to eliminate almost all noise is to not have any venting which increases the weight to 175 gr. minimum. Which the ventless ones are in the works 175 and 200 gr., but for the ones that want 125 and 150 gr. they have to have vents.
Thanks,
Boomer