VX4 Achieves Major Milestone With Launch of Phase 2 of Piloted Flight Testing

Vertical Aerospace (Vertical) [NYSE: EVTL], a global aerospace and technology company pioneering zero-emissions aviation, has seen its latest full scale VX4 prototype achieve piloted, untethered vertical take-off and landing for the first time as Phase 2 of its flight test programme begins.

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Vertical’s VX4 prototype begins untethered, piloted thrustborne testing. (Photo: Business Wire)

The VX4 prototype, powered by industry-leading battery packs delivering up to 1.4 MW of peak power, surpassed expectations in hover performance, control, and stability. Testing will now progress to low-speed manoeuvres using lift generated by the propellers at its Flight Test Centre at Cotswolds Airport, UK.

Thrustborne flights are designed to assess the aircraft’s stability, battery efficiency, control characteristics, aerodynamics, structural and dynamic loads and performance across different speeds, enabling further assessment of how the VX4 behaves under real-world flight conditions.

This marks an expansion of the VX4’s flight envelope beyond the initial tethered hover condition in Phase 1, as the prototype continues to operate under more demanding conditions, ensuring it meets the most stringent safety and regulatory standards.

The second of four testing phases follows the UK Civil Aviation Authority’s (CAA) expansion of Vertical’s Permit to Fly. To secure this expansion, Vertical submitted extensive documentation verifying the VX4 prototype’s safety under Phase 2 conditions. This included systems and structural validations, Phase 1 outcomes, flight test protocols, engineering specifications, and detailed operational procedures.

Stuart Simpson, CEO of Vertical Aerospace, said: “It's great to see the VX4 throw off the tethers and move to the next phase of our piloted test flight programme. We now enter a realm that very few companies in the world have achieved. Our team is thrilled with the significant strides we continue to make with the VX4 prototype as we expand our learnings and take another step towards connecting communities with faster, cleaner and safer travel.”

Simon Davies, Vertical’s Chief Test Pilot, who flew the VX4 prototype, said: “The aircraft performed absolutely brilliantly, and was really stable in the hover. The flight controls felt good, and it’s great to have the tethers off. Everything on the aircraft worked perfectly - no surprises, nice and boring - a great test flight. Definitely my favourite and most memorable flight in thousands of flight hours, but my job was really easy - standing on the shoulders of giants! So proud of our team.”