Skydweller Aero has completed a solar-powered autonomous flight of its proprietary unmanned aerial system (UAS) for the U.S. Navy. The most notable result of this lofty feat: The drone completed 73 hours of live testing, culminating in the aircraft meeting energy balance parameters for extended flight operations.

The three-day event saw the aircraft complete an endurance flight using solar energy over Stennis, Mississippi, proving the drone’s potential on maritime intelligence, surveillance and reconnaissance missions. Underpinning this performance are solar panels and backup batteries to ensure consistent operability in nighttime and low-light conditions.

The 5,620 pound (2,549 kilogram) aircraft has a maximum speed of 100 knots (115 miles/185 kilometers per hour) and a service ceiling of 45,000 feet (13,716 meters). Constructed primarily from carbon fiber components, the UAS can carry up to 800 pounds (363 kilograms) of payload. More than 17,000 individual solar cells are spread across roughly 2900 square feet of wing surface, generating up to 100 KW of electricity to propel the aircraft and power its sensors, communications equipment and other systems.

The U.S. Naval Air Warfare Center Aircraft Division plans additional testing of the craft this year in an effort to address U.S. Southern Command (SOUTHCOM) operational challenges, including drug trafficking and border security.