Sceye SE2 Unmanned Airship Sets New Stratospheric Distance Record

Sceye, the American aerospace startup, has marked a significant milestone in high-altitude aviation by successfully completing a grueling test flight under its ambitious Endurance Program. Utilizing the cutting-edge SE2 High-Altitude Platform Station (HAPS), this unmanned solar-powered airship demonstrated unprecedented performance in the stratosphere. The mission commenced on March 25, 2026, departing from the facility in Roswell, New Mexico, and concluded on April 6, 2026, off the coast of Brazil. During this 12-day journey, the vessel covered a staggering distance of more than 6,400 miles, consistently operating at altitudes exceeding 52,000 feet. This feat was made possible by the successful closing of power and pressure loops throughout multiple day and night cycles.

The success of this mission was underpinned by the airship's ability to maintain peak performance during transition periods between sunlight and darkness. According to Mikkel Vestergaard Frandsen, the founder and CEO of Sceye, this achievement represents a defining moment in establishing the stratosphere as a vital new layer of global infrastructure. Launching at precisely 8:26 AM Mountain Time (MT), the SE2 showed massive technical evolution from the company's 2024 Flight Dynamics Program. The airship spent over 88 hours hovering precisely over designated zones, including a full 24-hour cycle over New Mexico and three consecutive cycles in Brazil, maintaining a remarkably tight position-holding radius of just 1 kilometer.

Measuring 270 feet in length, the SE2 platform is an engineering marvel designed for long-term endurance. Its surface is covered with solar cells that charge high-capacity lithium-sulfur batteries, which boast an energy density of 425 Wh/kg. These batteries provide the necessary energy to drive the electric propeller through the dark hours of the night. By successfully closing the pressure loop, Sceye confirmed the structural integrity of its proprietary envelope, proving the platform is ready for missions lasting several months. This capability positions HAPS as a more flexible and cost-effective alternative to traditional low-earth orbit (LEO) satellites, particularly for tasks requiring persistent monitoring over a specific geographic location.

Established in 2014, Sceye has dedicated over a decade to refining HAPS technology for telecommunications and environmental surveillance. The company is now preparing for its first pre-commercial demonstration, slated for the summer of 2026 in Japan. This upcoming phase is conducted in partnership with SoftBank Corporation, which previously signaled its confidence in the technology with a $15 million investment. The Japanese mission will focus on testing a high-speed backhaul link to SoftBank’s core network and showcasing the SceyeCELL antenna system, which is designed to provide emergency connectivity during disasters. Unlike competitors like the Airbus Zephyr, which must fly in circles to stay aloft, Sceye's airship design allows it to maintain a fixed position, offering a distinct advantage in aerial persistence.