DARPA Aims To Build Bridge Across Technology’s 'Valley Of Death'

stealthy hybrid-electric unmanned aircraft concept
DARPA’s Shepard program will adapt IARPA’s ultraquiet ducted-fan Great Horned Owl (left) into a stealthy hybrid-electric unmanned aircraft.
Credit: DARPA
Few X-planes have ever led directly to an operational aircraft. Many of the technologies they pioneered have found their way into production aircraft but often after a gap of many years, even decades—an interregnum known as the “valley of death.” Shepard to fly stealthy hybrid-electric unmanned...

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