Sikorsky, a subsidiary of Lockheed Martin, has successfully flown a new uncrewed aerial system (UAS) using a ‘rotor blown wing’ design, which can operate in both helicopter and aeroplane modes. This 52kg, battery-powered, twin-prop-rotor prototype showcased its ability to remain stable and maneuverable in various flight conditions. The successful test also indicates the potential for scaling the design to larger models that would require hybrid-electric propulsion.
Rich Benton, Sikorsky’s Vice President and General Manager, explained, “By combining helicopter and aeroplane flight characteristics in a single flying wing, we are pushing the boundaries of next-generation vertical take-off and landing (VTOL) UAS. These aircraft can travel faster and farther than traditional helicopters. Our rotor blown wing platform is a clear example of how we’re using our 102 years of aviation experience to create designs that will meet the evolving needs of commercial and military operators.”
The rotor blown wing project is being led by Sikorsky Innovations, the company’s rapid prototyping group. Over the course of a year, the team has completed several stages of testing, including design, simulations, and both tethered and untethered flights. The tests have provided valuable data on the aircraft’s aerodynamics, flight control, and overall performance. In January 2025, Sikorsky Innovations achieved a major milestone, completing more than 40 take-offs and landings, as well as 30 transitions between helicopter and aeroplane modes with the 10.3ft composite wingspan aircraft.
Igor Cherepinsky, Director of Sikorsky Innovations, noted, “Our rotor blown wing has proven its ability to transition smoothly and predictably from hover to high-speed cruise flight and back. We developed new control laws to make this transition efficient, and the data suggests the aircraft can operate from pitching ship decks and uneven ground when scaled up to larger sizes.”
Future applications for the rotor blown wing UAS include search and rescue missions, firefighting, humanitarian aid, and pipeline surveillance.
