The United States Navy began its efforts to develop an aircraft carrier-based UAV in 2006. The original UCLASS concept was for a stealthy strike platform capable of penetrating enemy air defenses. In 2012, lethality and strike requirements were diluted in order to create an intelligence, surveillance and reconnaissance -oriented aircraft that could be developed quickly to conduct low-intensity counter-terrorism missions. On 1 February 2016, after many delays over whether the UCLASS would specialize in strike or ISR roles, it was reported that a significant portion of the effort would be directed to produce a Super Hornet-sized carrier-based aerial refueling tanker as the Carrier-Based Aerial-Refueling System, with "a little ISR" and some capabilities for communications relay, and strike capabilities put off to a future version of the aircraft. In July 2016, it was officially named "MQ-25A Stingray" after being named RAQ-25A in the Navy previously. The Pentagon apparently made this program change in order to address the Navy's expected fighter shortfall by directing funds to buy additional F/A-18E/F Super Hornets and accelerate purchases and development of the F-35C. Having the CBARS as the first carrier-based UAV provides a less complex bridge to the futureF/A-XX, should it be an unmanned strike platform. It also addresses the carriers' need for an organic refueling aircraft, proposed as a mission for the UCLASS since 2014, freeing up the 20–30 percent of Super Hornets performing the mission in a more capable and cost effective manner than modifying the F-35, V-22 Osprey, and E-2D Hawkeye, or bringing the retired S-3 Viking back into service. Four development contracts were issued in 2016, with a formal RFP expected in 2017, with operational status in the early to mid-2020s. Rear Adm. Michael Manazir has suggested that three of these UCAVs could fly with an F-35 for refueling and sensor operation. Vice Adm. Mike Shoemaker said that the MQ-25 can extend the Super Hornet's unrefueled combat radius to beyond. The Navy's goal for the aircraft is to be able to deliver of fuel total to 4 to 6 airplanes at a range of. The Navy released the final MQ-25 Stingray RFP in October 2017; the competitors are Lockheed Martin, Boeing, Northrop Grumman, and General Atomics.
Selection
Boeing secretly finished building its wing-body-tail in 2014 when the UCLASS program was paused, and revived it for the CBARS mission. On 19 December 2017, Boeing unveiled its prototype aircraft entrant incorporating lessons learned from the Boeing Phantom Rayflying wing and its other unmanned aerial systems. Boeing's MQ-25 design is not new for the tanking mission, but Boeing says that was considered when designing it. General Atomics proposed their Sea Avenger concept which is enlarged from its Predator-C/Avenger for refueling. The company stated that basing its MQ-25 design on Avenger reduces development time. Lockheed Martin has shown their Sea Ghost concept based on the RQ-170 Sentinel. Northrop Grumman announced on 25 October 2017 that it was withdrawing its X-47B from the MQ-25 competition, saying the company would have been unable to execute the program under the terms of the service's request for proposals. The company's departure signaled to some analysts that the Navy's requirements could favor wing-body-tail designs, not the flying wings thought to be proposed by Northrop Grumman and Lockheed Martin. On 30 August 2018, the U.S. Navy announced Boeing as the winner of the competition and awarded a $805 million development contract for four MQ-25A aircraft to be completed by August 2024. An additional three test MQ-25As were ordered on 2 April 2020 for a current total order of seven. The program may expand to $13 billion overall and consist of 72 aircraft.
Boeing's MQ-25 design is powered by one Rolls-Royce AE 3007Nturbofan engine delivering of thrust; it is a variant of the engine used to power the Navy's MQ-4C Triton. The aircraft is less stealthy than flying wing UAVs. However, it still features a stealthy fuselage shaping, flush inlet to shield engine blades from radar and V-tail.
