It’s not clear how heavy the XRQ-72A is, but another AFRL document we received said that the Great Horned Owl program’s requirements called for an air vehicle weighing between 300 to 400 pounds. The drone also appears to have at least some stealthy features, including its general shape and shrouded exhausts, and is made out of composite materials.
Its most important feature, of course, is its hybrid propulsion system. A pair of fuel-powered generators inside the central fuselage produce the electricity that powers four ducted fan propulsors mounted on top of the aircraft’s flying-wing fuselage. This is in some ways visually reminiscent of the general configuration of the Boeing X-48 series of experimental unmanned blended wing body demonstrators, but those aircraft used small turbojet engines.