Joby Aero Inc. has displayed its ultra-quiet operation, flown a promised distance and become an investment favorite in the last few months. Now it’s headed to Washington, D. C. to consolidate relations with law- and opinion makers. Quietude As a follow-up to its recent demonstration of quietude on Public Broadcasting’s “Great Electric Airplane Race,” Joby staged a head-to-head test of its near silent operation against other aircraft. Note the perceived noise and the aural signature as each craft passes overhead. Going the Distance One thing prominent in Joby’s on-line presence is their promise that their electric air taxi will be able to travel 150 miles on a single charge – including a vertical takeoff and landing. Flown from the ground by Chief Test Pilot Justin Paines, the machine, “…Took off vertically before transitioning to forward flight and completing 11 laps of a predefined circuit. After more than 1 hour and 17 minutes in the air, the aircraft landed vertically, having …