Jesus you're a walking dead man. Don't take pride in that.
Earlier you said mild downhill. How have you taken this up to 40mph? And going 40 without a helmet is a death wish. A simple mistake could end your entire life. There are lots of easy mistakes. Even for experienced riders. Go look up bails,bails, bails, by the S1 helmet guys. Scare yourself into not being a dumbass. @BradSBadEmd