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The US Defence Advanced Research Projects Agency (DARPA) announced on 24 June 2024, that the Series Hybrid Electric Propulsion AiRcraft Demonstration (Shepard) programme aircraft received its official designation, XRQ-73. The Series Hybrid Electric Propulsion AiRcraft Demonstration program, known as SHEPARD, has received its official X-plane designation: XRQ-73. SHEPARD is an “X-prime” program, leveraging the series […]