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The Defense Advanced Research Projects Agency said it conducted a flight of the XRQ-73, a hybrid-electric, unmanned experimental aircraft, at Edwards Air Force Base in California in April, working alongside the Air Force Research Laboratory and Northrop Grumman. The sortie is part of DARPA’s Series Hybrid Electric Propulsion AiRcraft Demonstration (SHEPARD) program, which aims to validate hybrid-electric propulsion for military use.
Program officials framed the flight as a step toward fielding new aircraft concepts that could capitalize on better fuel economy, lower emissions, and greater operational flexibility compared with traditional propulsion. While DARPA did not release technical details about the airframe or propulsion configuration, the SHEPARD effort focuses on series-hybrid architectures that blend conventional and electric power to drive propulsors.
“This milestone is not just about a single flight,” said Lt. Col. Clark McGehee, SHEPARD program manager. “The architecture proven by the XRQ-73 paves the way for new types of mission systems and delivered effects. We look forward to advancing this technology through the flight test program and delivering new capabilities for our warfighters.”
The test underscores the Pentagon’s broader interest in electrified propulsion, which could enable quieter operations, extended endurance through optimized engine loading, and new airframe layouts freed from traditional engine placement constraints. For unmanned systems in particular, hybrid-electric solutions may offer mission endurance gains and logistics advantages by reducing fuel consumption and maintenance demands.
Edwards Air Force Base, a long-standing hub for experimental flight testing, provided the venue for the April event. DARPA said the flight advances the SHEPARD program’s path toward a fuller test campaign but did not specify timelines for follow-on sorties or transition plans.
The XRQ-73 effort adds to a growing set of military and industry demonstrations exploring how hybrid-electric propulsion might be integrated into future aircraft fleets. By pairing DARPA’s rapid prototyping model with AFRL’s research infrastructure and Northrop Grumman’s aerospace expertise, the program is designed to turn laboratory advances into flight-proven capabilities that could inform operational systems.
