Vertical Aerospace Completes First Piloted Thrustborne Transition of a Full-Scale eVTOL Aircraft
Test pilot Paul Stone flew Vertical Aerospace's VX4 prototype through a vertical takeoff-to-wingborne flight transition at Cotswold Airport on April 2, marking a first for a piloted, full-scale eVTOL under UK Civil Aviation Authority oversight.
Overview
Vertical Aerospace, the UK-based electric aviation company, announced on April 6 that its VX4 prototype completed a piloted thrustborne transition on April 2 at the company’s Flight Test Centre at Cotswold Airport. Test pilot Paul Stone flew the aircraft through a vertical takeoff, then transitioned into wingborne cruise flight as the front propellers tilted forward and the rear propellers stowed, before executing a conventional runway landing, according to the company’s press release.
The flight represents the first time a piloted, full-scale eVTOL aircraft of this class has completed a thrustborne transition under the oversight of the UK Civil Aviation Authority. Vertical Aerospace described it as the most significant technical milestone in its ten-year history.
What Happened
During the transition sequence, the VX4 lifted off vertically using its rotors, operating in what the industry terms “helicopter mode.” The front propellers then tilted forward, shifting the source of lift from the rotors to the wings while the rear propellers stowed. The aircraft accelerated smoothly into wingborne flight before completing a conventional runway landing, according to BusinessWire.
This one-way transition represents the first half of the full two-way sequence required for commercial operations. In a complete mission profile, the aircraft would also decelerate from wingborne flight back to a vertical landing, eliminating the need for a runway and enabling operations from helipads, vertiports, and rooftops.
CEO Stuart Simpson said the achievement “marks a turning point” for the advanced air mobility industry, while Chief Engineer David King stated that “the aircraft performed exactly as designed, transitioning smoothly and under full control,” according to BusinessWire.
Testing History
The April 2 flight caps approximately two years of piloted flight testing across four phases. The program began with a tethered hover test in September 2024, progressed to untethered vertical takeoff and low-speed maneuvers in early 2025, and advanced to conventional wingborne flight by September 2025. The UK CAA granted Vertical Aerospace a Permit to Fly for the transition phase in November 2025 after reviewing over 200 minimum safe aircraft requirements and more than 20,000 pages of safety and technical documentation, according to BusinessWire.
The CAA has been working in close collaboration with the European Union Aviation Safety Agency on concurrent validation toward commercial approval for European airspace operations.
Financing and Commercial Outlook
The transition milestone arrived days after Vertical Aerospace announced an agreement in principle for a financing package of up to $850 million on March 30. The package includes an initial $50 million equity raise, with a further $30 million expected shortly, positioning the company with approximately $160 million in near-term working capital, according to BusinessWire.
The broader financing structure provides access to up to $800 million in additional committed capital through 2027 and beyond. Investment partners Mudrick Capital Management and Yorkville Advisors Global are backing the package, which includes extended convertible notes, a convertible preferred equity facility of up to $250 million, and an equity line of credit of up to $500 million, as Seeking Alpha reported. The parties committed to finalize definitive documents by April 19.
The Valo aircraft, as Vertical Aerospace has branded the commercial version, is designed to carry passengers with zero operating emissions at speeds of up to 150 mph over distances of up to 100 miles. The company has not disclosed a specific timeline for type certification or the start of commercial operations.