Why is there air? It starts and ends [relatively] motionless after the passage of the car. Velocity and pressure trade off with each other.
Where the 1930s Zeppelin designers used an airfoil section with a continuous curve from one end to the other, Mair was working on torpedoes, terminating a tubular body. 22° just falls out of the science.
I used 45° not 2x22° for simplicity's sake when I did these experiments:
