29 OCT 2025 -- Our team just hit a major milestone: Maiden flight of Evenstar, our full-scale stratospheric aircraft prototype (what we call StratoSats).
StratoSats are a new class of solar-powered, autonomous aircraft built to operate in the stratosphere. This first flight validated our rapid design, simulation, and build process, proving we can go from concept to full-scale flight in just a few months.
At Radical, our mission is to build enduring infrastructure in the sky. Evenstar represents a key step toward that vision. With a 120-foot wingspan, a 15-kilogram payload capacity, and a total mass of 110 kilograms, it demonstrates the lightweight, energy-efficient design required for continuous stratospheric flight.
Over the coming months, we’ll continue expanding flight operations as we prepare for high-altitude testing in 2026. Each flight brings us closer to demonstrating persistent, solar-powered connectivity and imaging from near space.
It’s truly remarkable what our lean team has achieved in just a few months. The skies are opening, and the potential to connect and observe our planet sustainably has never been greater.
– James & Cyriel