Electric Aircraft
Vertical Aerospace Completes Final VX4 Prototype and Plans Hybrid Expansion
Vertical Aerospace finishes third VX4 prototype, doubles test capacity, and plans hybrid-electric retrofit targeting longer range in 2026.
Vertical Aerospace (NYSE: EVTL) has officially announced the completion of its third and final full-scale VX4 prototype, a critical milestone intended to accelerate the company’s path toward Certification. According to a statement released on December 22, 2025, the new aircraft is scheduled to begin piloted flight testing in January 2026 following a brief commissioning phase.
The addition of this aircraft effectively doubles the Bristol-based manufacturer’s flight test capacity. By operating two identical full-scale prototypes simultaneously, Vertical Aerospace aims to increase the frequency of data gathering required for regulatory approval. This development comes shortly after the company unveiled “Valo,” its rebranded commercial production aircraft, and signaled a strategic expansion into hybrid-electric propulsion for defense and logistics markets.
The newly completed aircraft is a VX4 model, identical to the second prototype that has been undergoing rigorous testing in the UK. In November 2025, the existing prototype received its Permit to Fly and has since completed 10 piloted flights, successfully expanding the aircraft’s flight envelope. The primary role of this final prototype is to serve as a workhorse for validating aerodynamics, flight control software, and battery technologies.
According to the company’s announcement, the immediate schedule for the new unit involves post-production systems checks followed by a maiden piloted flight in January. Stuart Simpson, CEO of Vertical Aerospace, emphasized the importance of this addition to their fleet:
“As we look ahead to 2026, the addition of our final prototype marks an important step in closing out our prototype flight test programme and maintaining momentum towards commercialization. Our test pilots are eager to get this aircraft into the air.”
While the immediate focus remains on electric vertical takeoff and landing (eVTOL) certification, Vertical Aerospace is simultaneously broadening its technological scope. The company revealed that later in 2026, this final prototype will be retrofitted with a hybrid-electric propulsion system. This modification is designed to test long-range capabilities, with a target range of up to 1,000 miles, significantly higher than the ~100-mile range of the all-electric configuration.
This hybrid strategy targets the defense, logistics, and emergency medical services (EMS) sectors, where range and payload often outweigh the requirement for zero-emission short hops. The company projects a payload capacity of approximately 1,100 kg for this variant.
Vertical Aerospace has clarified the distinction between the testing hardware and the final commercial product. The aircraft currently flying, and the unit just completed, are VX4 prototypes. These utilize the original fuselage design and distributed battery packs to validate core systems.
In contrast, the commercial model, branded as Valo, features a redesigned fuselage, a V-tail with a tail wheel, and an under-floor liquid-cooled battery system. While the flying prototypes remain in the UK for technical validation, Vertical Aerospace plans to launch a US tour in January 2026, starting in New York City. This tour is expected to feature a full-scale static model of Valo to demonstrate the passenger experience to investors and partners. The expansion of the flight test program occurs against a backdrop of careful capital management. As of November 2025, Vertical Aerospace reported a cash position of approximately £89 million ($117 million). The company has stated this funding provides a runway through mid-2026, with a controlled net operating cash outflow guidance of $110–125 million for the 2025 fiscal year.
Key milestones for the upcoming year include:
The completion of a third prototype is a standard but vital step in aerospace certification; redundancy allows for parallel testing streams, one aircraft can focus on performance handling while the other tests system reliability or failure modes. However, the most significant revelation in this update is the concrete timeline for the hybrid-electric retrofit.
By targeting a 1,000-mile range with a hybrid variant, Vertical Aerospace is effectively hedging its bets. The pure-electric urban air mobility market is crowded and infrastructure-dependent. A hybrid variant opens immediate doors to military and cargo contracts that are less sensitive to noise and battery density constraints. With a cash runway extending only to mid-2026, demonstrating a viable hybrid technology later that year could be a decisive factor in securing the next tranche of necessary funding.
Vertical Aerospace Completes Final VX4 Prototype, Targets Hybrid Expansion in 2026
Accelerating the Path to Certification
Strategic Pivot: Hybrid Propulsion and the “Valo” Tour
Distinguishing Prototype from Product
Financial Outlook and Timeline
AirPro News Analysis
Sources
Photo Credit: Vertical Aerospace