#1811: N2end

A friend recently reminded me about the Kamm back aerodynamic design for road vehicles.

I have also been reading about the genius who has invented a car engine which runs on liquid nitrogen.

Today’s invention is a related approach.

A vehicle has a tank of liquid nitrogen aboard. In order to boost the ‘air’ pressure at the rear of the vehicle, and cut the form drag radically, it continuously releases some of the nitrogen into the space which would otherwise be a low-pressure, fuel-wasting vortex.