Electric Aircraft
Vertical Aerospace VX4 Completes First Wing-Borne Flight Test
Vertical Aerospace’s VX4 eVTOL completes first wing-borne flight, advancing toward 2028 certification for sustainable urban air mobility.
Vertical Aerospace’s VX4 Achieves Milestone with First Wing-Borne Flight
The electric vertical take-off and landing (eVTOL) sector continues to gain momentum, with Vertical Aerospace marking a major milestone in its development roadmap. On 22 May 2025, the UK-based aerospace company successfully completed the first wing-borne flight of its VX4 prototype. This flight not only demonstrated the aircraft’s ability to transition from vertical to conventional flight but also validated critical aspects of its design and performance.
As the global aviation industry shifts toward sustainable, zero-emission solutions, eVTOLs are emerging as a promising alternative for short-haul urban and regional transport. Vertical Aerospace’s VX4 is designed to meet this demand with a focus on safety, efficiency, and environmental responsibility. The successful wing-borne flight marks a pivotal step in the VX4’s path to certification and commercial deployment, positioning the company among the frontrunners in the urban air mobility (UAM) race.
Understanding the VX4 and Its Flight Test Program
Design and Capabilities of the VX4
The VX4 is an all-electric aircraft designed to carry four passengers and a pilot. With a projected range of approximately 100 miles (160 km) per charge and a cruise speed of around 130 knots (240 km/h), the VX4 aims to offer a viable alternative to ground-based transport in congested urban areas. Its hybrid design allows for both vertical take-off and landing (VTOL) and fixed-wing cruise, combining the benefits of helicopters and airplanes.
Key features of the VX4 include low noise emissions, zero operational emissions, and compliance with stringent aviation safety standards. The aircraft’s propulsion system is powered by electric motors, and its aerodynamic design supports efficient wing-borne flight, which is essential for extending range and reducing energy consumption.
Vertical Aerospace plans to conduct a series of test flights in different configurations. The current phase involves conventional take-off and landing (CTOL) flights, with around a dozen such sorties planned before transitioning to full VTOL testing. These tests are crucial for collecting performance data and refining digital models used in the aircraft’s development.
“The VX4 handled beautifully, and the transition to fixed-wing flight was smooth and stable, giving us confidence in the aircraft’s design and control systems.”
– Si Davies, Chief Test Pilot, Vertical Aerospace
Details of the Wing-Borne Flight
The milestone flight took place at Vertical Aerospace’s Kemble test facility in southwest England. According to chief test pilot Si Davies, the VX4 rotated at 85 knots and cruised at approximately 100 knots during the flight, which ventured beyond the airfield for the first time. The approach was performed at 95 knots, and future tests are expected to push cruise speeds to 120 knots, nearing the 130-knot target for the production model.
Davies praised the aircraft’s responsiveness and natural handling, noting that the propulsion system performed as predicted. “It is very responsive in acceleration along the runway, it got into the air very quickly indeed,” he said. The aircraft’s performance during this flight validated pre-flight modeling related to drag and motor output, reinforcing confidence in the VX4’s design.
Leading up to the wing-borne flight, the team conducted extensive low-speed taxi tests, including multiple runs at speeds just below take-off velocity. These preparations were essential for ensuring readiness and safety, both for the aircraft and the test crew.
Next Steps in the Flight Test Campaign
Following the initial wing-borne flight, Vertical Aerospace plans to expand the flight envelope with additional sorties in CTOL mode. These will incrementally increase flight duration and speed to further validate battery and motor performance under varied conditions. The goal is to build a robust dataset that supports eventual certification and commercial readiness.
The next major milestone in the test program is the transition from thrust-borne (hover) to wing-borne flight while operating in full VTOL mode. This complex maneuver represents the final phase of the flight-test plan and is expected to occur in the second half of 2025. Achieving a seamless transition is critical for demonstrating the VX4’s operational versatility.
In parallel, Vertical Aerospace is preparing a second VX4 prototype for flight testing. This aircraft will join the test fleet in the coming months, allowing the company to accelerate data collection and refine its models. The company has stated a target certification date of 2028, aligning with evolving regulatory frameworks for eVTOL aircraft.
Industry Implications and Competitive Landscape
Urban Air Mobility and Market Context
The VX4’s progress reflects broader trends in the eVTOL industry, which is projected to become a multi-billion-dollar market by 2030. Factors driving this growth include urban congestion, environmental concerns, and advancements in electric propulsion and autonomous flight technologies. Companies like Joby Aviation, Lilium, and Archer Aviation are also racing to bring certified eVTOLs to market, creating a competitive yet collaborative ecosystem.
Vertical Aerospace’s approach emphasizes certification under existing aviation regulations, working closely with the UK Civil Aviation Authority (CAA). This strategy may offer a more streamlined path to market compared to companies pursuing novel certification categories. The CAA’s approval of the recent test flight underscores the regulator’s confidence in the VX4’s development process.
Successful demonstration of wing-borne flight is a key differentiator in the eVTOL space. While many prototypes can hover, transitioning to efficient fixed-wing flight is essential for achieving the range and speed necessary for commercial viability. The VX4’s hybrid design addresses this challenge directly, offering a blend of performance and operational flexibility.
Technical and Operational Challenges
Despite recent successes, challenges remain. Battery energy density continues to limit range and payload capacity for electric aircraft. Vertical Aerospace must also ensure that its aircraft can operate safely in diverse weather conditions and integrate seamlessly into existing air traffic management systems.
Another hurdle is public acceptance and infrastructure readiness. Urban air mobility requires dedicated vertiports, charging infrastructure, and robust flight planning tools. While technology is advancing rapidly, the supporting ecosystem must evolve in parallel to enable widespread adoption.
Vertical Aerospace is addressing these issues through partnerships and simulations. The company is leveraging digital twin technology to model real-world performance and collaborating with stakeholders to plan future operational scenarios. These efforts aim to de-risk deployment and build confidence among regulators, operators, and the public.
Conclusion
The first wing-borne flight of Vertical Aerospace’s VX4 prototype marks a significant achievement in the journey toward sustainable urban air mobility. The successful transition from ground to fixed-wing flight validates the aircraft’s design and sets the stage for more complex test scenarios. With additional flights planned and a second prototype on the way, Vertical is steadily building momentum toward certification.
Looking ahead, the VX4’s development will be closely watched as a bellwether for the eVTOL industry. As regulatory frameworks solidify and infrastructure begins to take shape, aircraft like the VX4 could redefine short-haul transport in cities worldwide. The combination of zero emissions, reduced noise, and operational flexibility makes eVTOLs a compelling solution for the future of mobility.
FAQ
What is the VX4?
The VX4 is an electric vertical take-off and landing (eVTOL) aircraft developed by Vertical Aerospace. It is designed to carry four passengers and a pilot over short distances with zero emissions.
What was significant about the recent flight?
The VX4 completed its first wing-borne flight, transitioning from ground take-off to conventional fixed-wing flight. This validated key aspects of its design and performance.
When is the VX4 expected to be certified?
Vertical Aerospace is targeting certification for the VX4 in 2028, pending successful completion of flight testing and regulatory approvals.
How does the VX4 compare to other eVTOLs?
The VX4 combines vertical take-off capabilities with efficient fixed-wing cruise, offering a balance of range, speed, and operational flexibility. It competes with models from Joby Aviation, Lilium, and others.
What are the next steps in the VX4 test program?
Vertical Aerospace will conduct additional CTOL flights before transitioning to full VTOL testing, including thrust-to-wing-borne transitions later in 2025.
Sources
Photo Credit: VerticalAerospace
Electric Aircraft
Unither Bioélectronique Completes First Hydrogen-Electric Helicopter Flight
Unither Bioélectronique achieved the first piloted hydrogen-electric helicopter circuit flight in Québec using a modified Robinson R44 under Project Proticity.
This article is based on an official statement from Robinson Helicopter Company.
Unither Bioélectronique has successfully completed the world’s first piloted hydrogen-electric Helicopters circuit flight in Québec, marking a significant milestone in zero-emission aviation. The historic flight was achieved using a modified Robinson R44 helicopter as part of the ongoing Project Proticity initiative.
According to an official company press release, the milestone serves as a critical proof of concept for the future of clean vertical lift. The company emphasized the dual benefits of the new propulsion system combined with established airframes.
“This successful demonstration highlights the potential of hydrogen-electric Propulsion to deliver zero-emission flight while building on the proven reliability and cost efficiency that Robinson helicopters have come to define,” the company stated in its release.
The achievement represents a major step forward from initial hover tests, moving the technology closer to real-world applications. Industry reports indicate that the ultimate goal of this technology is to create a scalable, zero-emission transportation network for critical medical deliveries.
Project Proticity and the Historic Flight
Flight Details
The milestone circuit flight took place on April 10, 2026, at Roland-Désourdy Airport in Bromont, Québec, with Unither Bioélectronique test pilot Ric Webb at the controls. According to industry reporting by Vertical Magazine and Skies Mag, the flight advanced the company’s testing from a basic hover demonstration, first achieved in March 2025, to a full airport traffic circuit. This comprehensive flight profile included a controlled takeoff, climb, pattern flight, approach, and landing, all conducted under an experimental flight permit.
The Technology
The modified Robinson R44 test aircraft was equipped with a Hydrogen-electric proton exchange membrane (PEM) fuel-cell and battery architecture. The system was powered by locally produced green hydrogen, replacing the traditional piston engine. In its press release, Unither Bioélectronique highlighted that the demonstration showcases the potential of hydrogen-electric propulsion to deliver zero-emission flight without sacrificing operational reliability.
Future Implications for Zero-Emission Aviation
Scaling to the R66
Project Proticity, a collaboration between Unither Bioélectronique and Robinson Helicopter Company announced in August 2024, is not stopping at the R44 airframe. According to reporting by Aviation International News, the partners intend to scale the hydrogen-electric architecture to the larger Robinson R66 platform. Future phases of development are expected to integrate a liquid hydrogen storage system. This upgrade could significantly extend the aircraft’s range compared to the current gaseous hydrogen setup, with industry estimates from Vertical Magazine suggesting a potential range of around 100 nautical miles.
Organ Delivery Mission
Unither Bioélectronique operates as a subsidiary of United Therapeutics. Public remarks and company statements from previous milestones reveal that the intended end-use for these zero-emission helicopters is the rapid transport of manufactured organs to transplant patients. By utilizing hydrogen propulsion, the company hopes to establish a clean, efficient logistics network for life-saving medical supplies across North-America.
AirPro News analysis
The transition from a three-minute hover test in early 2025 to a full circuit flight in April 2026 demonstrates a rapid maturation of Unither Bioélectronique’s PEM fuel-cell technology. However, scaling this architecture to the Robinson R66 and transitioning to liquid hydrogen will introduce new thermal management and storage complexities. Furthermore, achieving Certification from Transport Canada Civil Aviation and the U.S. Federal Aviation Administration (FAA) remains a critical hurdle before these aircraft can enter commercial service for organ delivery. We will continue to monitor the regulatory progress of Project Proticity as it moves toward commercialization.
Frequently Asked Questions
What is Project Proticity?
Project Proticity is a collaborative development program between Unither Bioélectronique and Robinson Helicopter Company aimed at creating zero-emission, hydrogen-electric helicopters based on the Robinson R44 and R66 models.
When did the first circuit flight take place?
The world’s first piloted hydrogen-electric helicopter circuit flight was conducted on April 10, 2026, at Roland-Désourdy Airport in Bromont, Québec.
What is the ultimate goal of these hydrogen helicopters?
Unither Bioélectronique plans to use these zero-emission helicopters to transport manufactured organs for transplant patients across a scalable transportation network.
Sources: Robinson Helicopter Company
Photo Credit: Robinson Helicopter Company
Electric Aircraft
Vaeridion selects Garmin avionics for electric Microliner test flights
Vaeridion integrates Garmin G600 TXi displays in its electric Microliner test aircraft, targeting commercial service by 2030 with new battery facility at Oberpfaffenhofen.
This article is based on an official press release from Vaeridion.
Electric aircraft manufacturer Vaeridion has announced the selection of Garmin avionics to equip the initial test articles of its fully electric Microliner. According to a company press release, the manufacturer will integrate Garmin’s G600 TXi flight displays into the test aircraft, marking a critical milestone as the company prepares for its inaugural flight.
The integration of established avionics is a key step in advancing the development of the Microliner. Vaeridion has stated that the aircraft is currently targeted to enter commercial service in 2030, aiming to bring zero-emission commercial flights to the regional aviation market.
Advancing the Microliner Test Campaign
Avionics Selection and Integration
In its official announcement, Vaeridion highlighted that the Garmin G600 TXi flight display was chosen for its flexible integration and proven performance. The system features a modern touchscreen interface designed to enhance situational awareness and operational efficiency for test pilots.
Company officials noted that Garmin’s safety systems set a benchmark in the sector, making the G600 TXi an ideal foundation not only for the upcoming flight-test campaign but also for future cockpit developments.
“Equipping the Microliner with a best-in-class avionics suite from Garmin was a natural choice for us,”
stated Markus Kochs-Kämper, Chief Technology Officer at Vaeridion, in the press release. He added that the system provides the reliability and flexibility required for a rigorous flight-test program.
Garmin also expressed enthusiasm for the partnership. In the release, Carl Wolf, Garmin’s Vice President of Aviation Sales, Marketing, Programs & Support, noted the benefits of the integration:
“The advanced flight display capabilities coupled with a touchscreen interface provide a modern solution and safety-enhancing technologies to the aircraft,”
Wolf stated.
Scaling Up for First Flight
Recent Infrastructure Milestones
Beyond the avionics selection, Vaeridion is actively scaling its physical infrastructure to support the Microliner’s development timeline. According to the company’s statement, the manufacturer recently inaugurated a new battery manufacturing facility and test house.
Located at the Oberpfaffenhofen special airport, this new facility is intended to strengthen Vaeridion’s vertical integration. The company emphasized that expanding its in-house capabilities allows for greater control over critical technologies as it pushes toward its first-flight and subsequent certification phases.
AirPro News analysis
We view Vaeridion’s decision to partner with an established avionics provider like Garmin as a strategic move to mitigate risk during the flight-test phase. By utilizing off-the-shelf, certified components such as the G600 TXi, electric aircraft startups can focus their engineering resources on their core proprietary technologies, namely, the electric propulsion and battery systems.
The 2030 target for commercial service remains ambitious but aligns with the broader industry timeline for next-generation regional aircraft. The recent opening of the battery facility at Oberpfaffenhofen further indicates that Vaeridion is transitioning from conceptual design to physical hardware testing, a critical phase where supply chain and integration partnerships become paramount.
Frequently Asked Questions
What avionics system will the Vaeridion Microliner use?
According to the company’s press release, the initial test aircraft will be equipped with Garmin G600 TXi flight displays.
When is the Vaeridion Microliner expected to enter service?
Vaeridion has stated that the fully electric Microliner is slated to enter commercial service in 2030.
Where is Vaeridion’s new battery facility located?
The company recently opened a battery manufacturing facility and test house at the Oberpfaffenhofen special airport.
Sources
Photo Credit: Vaeridion
Electric Aircraft
Smartflyer and H55 Advance SFX1 Hybrid-Electric Aircraft Development
Smartflyer receives certified Adagio battery modules from H55, advancing the SFX1 hybrid-electric aircraft toward 2026 testing and flight phases.
This article is based on an official press release from H55 and Smartflyer.
Swiss electric aviation companies Smartflyer and H55 have announced a significant milestone in the development of the SFX1 hybrid-electric aircraft. According to a joint press release, Smartflyer has officially received the first batch of Adagio battery modules from H55, marking a critical step forward for the SFX1 Proof of Concept Demonstrator program.
The delivery enables Smartflyer to transition from component-level validation to full system integration and testing. For H55, the handover represents the continued integration of its certification-ready battery systems into active aircraft development programs, reinforcing its position in the electric propulsion market.
The SFX1 program is now entering an advanced stage of development. With the battery modules in hand, integration activities are intensifying across multiple workstreams, keeping the aircraft on track for its upcoming testing phases.
The SFX1 Program Advances
System Integration and Testing
The newly delivered Adagio battery modules will be integrated into the SFX1 aircraft as part of the next phase of development. According to the press release, this phase includes comprehensive system-level validation covering the propulsion architecture, energy management, and other critical aircraft systems.
Ground testing of the SFX1 is planned for the summer of 2026, with the first flight targeted for autumn of the same year.
“Receiving the first Adagio battery modules from H55 is a major milestone for Smartflyer and a key enabler for the next phase of our development program,” said Rolf Stuber, CEO of Smartflyer, in the company’s press release. “It also highlights the strength of our collaboration with a partner whose technology is not only innovative but ready for real-world application.”
About the Smartflyer SFX1
Industry estimates and company specifications indicate that the Smartflyer SFX1 is a four-seat hybrid-electric aircraft designed for sustainable pilot training and touring. The aircraft features a unique design with a tail-mounted propeller, which allows for laminar airflow and increases efficiency by up to 30 percent compared to conventional configurations. The hybrid system aims to reduce carbon dioxide emissions by 50 percent and noise by 60 percent, while offering a range of up to 750 kilometers (400 nautical miles).
H55’s Adagio Battery System
Certification and Commercial Deployment
The delivery of the Adagio modules reflects the maturity of H55’s product portfolio. The press release notes that the Adagio battery system has successfully completed all regulator-required certification tests, demonstrating its safety, reliability, and suitability for integration across various electric and hybrid-electric aircraft applications.
“This delivery marks an important step in bringing H55’s certified battery and propulsion solutions into operational aircraft programs,” said Rob Solomon, Chief Executive Officer of H55. “Our collaboration with Smartflyer illustrates how our technology, spanning both electric and hybrid-electric configurations, is moving from development into commercial application.”
AirPro News analysis
We note that the partnership between Smartflyer and H55 highlights the growing momentum in the Swiss electric aviation sector. H55, founded in 2017 by the technological legacy team behind the Solar Impulse program, has been steadily expanding its footprint. The company’s certification-grade energy storage systems are not only powering the SFX1 but are also slated for use in other notable projects, including the Bristell B23 Energic and a Pratt & Whitney Canada regional hybrid-electric flight demonstrator.
By securing regulatory approval for its battery modules, H55 is addressing one of the most significant bottlenecks in electric aviation, certification. For Smartflyer, leveraging a pre-certified battery system significantly reduces development risk and accelerates the path to market for the SFX1. If the summer 2026 ground tests and autumn 2026 first flight proceed as planned, we expect the SFX1 could become a strong contender in the emerging market for sustainable flight training and regional touring aircraft.
Frequently Asked Questions (FAQ)
What is the Smartflyer SFX1?
The Smartflyer SFX1 is a hybrid-electric aircraft currently in development in Switzerland. It is designed to be a four-seat aircraft suitable for sustainable pilot training and touring, featuring a distinctive tail-mounted propeller.
Who is providing the batteries for the SFX1?
H55, a Swiss-based company specializing in certified electric propulsion and energy storage systems, is providing its Adagio battery modules for the SFX1.
When will the Smartflyer SFX1 fly?
According to the official press release, ground testing is scheduled for the summer of 2026, with the first flight targeted for the autumn of 2026.
Sources
Photo Credit: H55
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