Project Heaviside is Kitty Hawk’s latest high-performance electric VTOL vehicle. It is designed to be fast, small and exceedingly quiet.
The Heaviside vehicle is roughly 100 times quieter than a regular helicopter. Once in the air, the vehicle blends into the background noise of a city or suburb, barely discernible to the human ear. Heaviside can travel from San Jose to San Francisco in 15 minutes and uses less than half the energy of a car.
source Kitty Hawk