Extremely loud whistling arrows

I have found a way of making very loud whistling arrows.
They are NOT my own design, I discovered this version last week. I decided to try to make a few and test them. I can absolutely confirm that this guy has designed a perfect simple but very loud whistling arrow.

Link to the guy I just subscribed to : https://www.youtube.com/watch?v=ntCqbZ631jA

Видео Extremely loud whistling arrows канала Roger Huyton