A160T Hummingbird comes in for a landing

The A160T Hummingbird comes in for a landing May 9 at the U.S. Army's Yuma Proving Ground in Arizona after a high-altitude hovering demonstration.

(Credit: Boeing)

A disparate pair of aviation R&D projects at Boeing have hit milestones recently.

The A160T Hummingbird, a helicopter-style unmanned ...