Unlocking a new layer of infrastructure in the stratosphere

We build StratoSats - autonomous aircraft that deliver persistent, high-performance infrastructure from 65,000 ft. The fly continuously for months without landing, powered only by the sun. Free from orbital constraints, they're low-cost, can reposition in real-time, and can return to swap payloads when needed.

To date, we've designed, built, and flown multiple sub-scale aircraft, including our autonomous prototype that completed a 24+ hour flight at low altitude.

Our team

At Radical, we take on complex, high-stakes problems because that’s where we do our best work. Our team brings deep experience from top aerospace and defense companies, and we apply that expertise with a focus on what actually matters. We build systems that are grounded in physics, shaped by real-world constraints, and designed to be as simple as they can be. We take the work seriously, not ourselves, and we care most about building things that perform when it counts.