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CFM RISE Program Advances Engine Durability with Early Dust Testing

CFM RISE program pioneers early dust ingestion testing to enhance engine durability and cut fuel consumption by 20 percent for sustainable aviation.

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Introduction: The Significance of Dust Ingestion Testing in the CFM RISE Program

The aviation industry is undergoing a transformative period as it seeks to balance the demands of efficiency, sustainability, and reliability. At the forefront of this evolution is the CFM International Revolutionary Innovation for Sustainable Engines (RISE) program, a collaborative initiative between GE Aerospace and Safran Aircraft Engines. With ambitious goals to drastically reduce fuel consumption and carbon emissions, the RISE program represents a pivotal step toward achieving net-zero emissions in aviation by 2050.

One of the most critical challenges facing modern jet engines is their ability to withstand harsh operating environments, particularly those involving dust and sand ingestion. The lessons learned from the in-service durability issues of current-generation engines, such as the CFM LEAP, have underscored the necessity for rigorous and early testing. By initiating dust ingestion testing earlier in the development cycle than ever before, the RISE program is setting a new standard for durability and reliability in next-generation aircraft propulsion systems.

This article explores the significance of dust ingestion testing within the context of the RISE program, delving into its technical objectives, testing methodology, and broader implications for the future of sustainable aviation.

CFM RISE Program: Ambitions, Architecture, and Industry Context

Program Overview and Sustainability Goals

Launched in June 2021, the CFM RISE program is a technology demonstration initiative aimed at redefining single-aisle aircraft engines for the mid-2030s and beyond. The central objectives of the program are to achieve more than a 20% reduction in both fuel consumption and CO2 emissions compared to the most efficient engines currently in service. This aligns with the aviation sector’s broader commitment to achieving net-zero carbon emissions by 2050.

In pursuit of these targets, the RISE program is developing a suite of advanced technologies. These include compatibility with 100% Sustainable Aviation Fuel (SAF) and hydrogen, a new generation open fan (open rotor) architecture, and hybrid electric capabilities. The open fan design, in particular, is a significant departure from traditional turbofan engines, allowing for a much higher bypass ratio and, consequently, greater efficiency.

The RISE program’s approach is not only about meeting environmental goals but also about ensuring that these next-generation engines can operate at the same speeds as current single-aisle aircraft, up to Mach 0.8. Over 350 technology tests have already been completed, laying a robust foundation for further development and validation.

“Over the past 50 years ducted engines have steadily improved, but they are now approaching the limits in terms of efficiency.”, Delphine Dijoud, Vice President of Engineering Deputy for Commercial Engines, Safran Aircraft Engines

Open Fan Architecture and Advanced Materials

The open fan, or open rotor, architecture is a defining feature of the RISE program. By eliminating the traditional engine nacelle and allowing the fan blades to operate in the open, this design achieves a significantly higher bypass ratio. This is a key enabler for the program’s ambitious efficiency targets, as it allows more air to flow around the engine core, reducing specific fuel consumption.

To withstand the increased thermal and mechanical stresses associated with higher operating temperatures and pressures, the RISE program is leveraging advanced materials. Ceramic matrix composites (CMCs) and carbon-fiber composite fan blades are being incorporated to reduce weight and improve thermal resistance. These materials are critical for the engine’s “compact core,” which is designed to maximize thermal efficiency while operating in demanding conditions.

Additionally, the program is investigating hybrid-electric propulsion systems and is actively engaged in research on hydrogen-powered engines. Partnerships with organizations such as NASA, Airbus, and Boeing are facilitating the development of these cutting-edge technologies, which could redefine the propulsion landscape for decades to come.

Dust Ingestion Testing: Methodology, Rationale, and Early Findings

Testing Approach and Objectives

Dust ingestion testing is a cornerstone of the RISE program’s durability validation. The tests are designed to simulate the harsh conditions that engines may encounter during real-world operations, particularly in environments with high concentrations of dust and sand. The primary focus is on the high-pressure turbine (HPT) airfoils within the engine’s compact core, which are subjected to elevated temperatures and pressures.

The testing methodology involves the use of a GE F110 military engine as a testbed for the new HPT airfoils. A specialized rig injects dust into the engine over thousands of cycles, replicating all phases of flight, from takeoff and climb to cruise and landing. This process allows engineers to observe the interaction between molten particles and the thermal barrier coatings (TBCs) that protect turbine blades from damage.

Notably, these endurance tests are being conducted much earlier in the development cycle than in previous programs. For example, similar durability tests for the CFM LEAP engine were performed only after the engine had entered service, leading to unexpected operational challenges. By contrast, the RISE program’s proactive approach aims to identify and address potential durability issues before the engine reaches commercial deployment.

“It’s an example of how serious we take the durability and safety of these engines.”, Arjan Hegeman, General Manager of Future of Flight Technology, GE Aerospace

Preliminary Results and Industry Collaboration

Early results from the dust ingestion tests have been promising. Endurance tests on the high-pressure turbine have already accumulated over 2,000 cycles on an F110 engine, with the next phase set to replicate these cycles under dust ingestion conditions. These tests are crucial for validating the effectiveness of new materials and coatings in protecting engine components from erosion and thermal damage.

The RISE program’s durability testing is being conducted in close collaboration with industry partners and regulatory agencies, including NASA, the Federal Aviation Administration (FAA), and European aviation authorities. This collaborative approach ensures that the testing protocols and findings are aligned with international safety and certification standards.

The program’s emphasis on early and comprehensive testing is a direct response to the operational realities faced by airlines, particularly those operating in regions with frequent dust storms or sandy environments. By addressing these challenges at the design and validation stage, the RISE program aims to deliver engines that are not only more efficient but also more reliable and cost-effective to maintain.

Recent Developments, Future Timeline, and Broader Implications

Technological Advancements and Demonstration Milestones

In 2024, the RISE program achieved a significant milestone by completing over 300 hours of wind tunnel testing on a one-fifth scale model of the open fan turbine at ONERA, the French national aerospace research center. These tests provided critical data on aerodynamic performance and noise characteristics, informing further refinements to the engine’s design.

Full-scale demonstrator parts are now being manufactured, marking the transition from laboratory research to hardware validation. CFM is working closely with Airbus to prepare for an open fan flight demonstration, which will use an Airbus A380 as a flying testbed. Ground and flight tests are anticipated to begin later this decade, providing valuable insights into the engine’s real-world performance.

Beyond traditional jet fuel, the RISE program is also involved in research on hydrogen propulsion through the ZEROe program with Airbus and hybrid-electric systems in collaboration with Boeing and NASA. These initiatives are part of a broader industry push to diversify energy sources and reduce the environmental footprint of aviation.

Broader Industry Impact and Future Prospects

The RISE program’s innovations are set against the backdrop of an industry-wide effort to address the environmental impact of commercial aviation. The move toward open fan architecture, advanced composite materials, and alternative fuels represents a significant technological shift for the sector. If successful, these advancements could redefine the design and operation of single-aisle aircraft, the most widely used category in commercial aviation.

The early and rigorous approach to durability testing, particularly in the context of dust ingestion, highlights the growing importance of engine reliability and lifecycle cost management. Airlines operating in diverse and challenging environments stand to benefit from engines that can maintain high performance and efficiency while minimizing maintenance disruptions.

As the RISE program progresses toward its goal of entering service in the mid-2030s, its outcomes will likely influence not only the design of future engines but also industry standards for testing, certification, and environmental compliance.

Conclusion: Key Takeaways and Future Implications

The CFM RISE program’s early and comprehensive dust ingestion testing marks a significant advancement in the pursuit of durable, efficient, and sustainable aircraft engines. By integrating lessons learned from previous engine programs and leveraging the latest in materials science and aerodynamic design, the RISE initiative is setting new benchmarks for the industry.

Looking ahead, the continued collaboration among engine manufacturers, airframers, regulatory bodies, and research institutions will be critical for realizing the full potential of these technologies. As the RISE program moves closer to flight demonstrations and eventual commercial deployment, its innovations could play a pivotal role in shaping the next generation of environmentally responsible air travel.

FAQ

What is the primary goal of the CFM RISE program?
The main objective is to develop a next-generation engine that is at least 20% more fuel-efficient and produces 20% fewer CO2 emissions than current engines, with compatibility for 100% Sustainable Aviation Fuel and hydrogen.

Why is dust ingestion testing important for aircraft engines?
Dust ingestion testing evaluates the durability of engine components, particularly turbine blades, in harsh environments. This helps ensure reliability and reduces maintenance costs for airlines operating in dusty or sandy regions.

What makes the RISE program’s approach to testing different from previous programs?
The RISE program conducts durability and dust ingestion tests much earlier in the development cycle, allowing potential issues to be identified and addressed before the engine enters commercial service.

When could the RISE engine technology enter service?
The technologies developed under the RISE program could be available for new aircraft in the mid-2030s, pending successful demonstration and certification.

Sources: CFM International Press Article

Photo Credit: CFM

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Technology & Innovation

Airbus Unveils Wildfire Sentinel to Enhance Global Firefighting Response

Airbus launched Wildfire Sentinel, a digital ecosystem using AI and broadband connectivity to improve wildfire response times, tested in Nîmes, France.

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This article is based on an official press release from Airbus.

On May 29, 2026, Airbus officially unveiled the Wildfire Sentinel, a holistic, data-driven digital ecosystem designed to modernize and accelerate global wildfire management. By seamlessly interconnecting drones, helicopters, fixed-wing aircraft, and ground crews in real time, the system aims to drastically reduce the critical time between detecting a spark and delivering the first drop of water.

According to the official press release, the solution addresses the growing global challenge of extreme wildfire seasons. Historically, firefighting operations have relied heavily on fragmented radio calls and traditional mobile phone networks, which frequently fail or become overloaded in remote or disaster-stricken environments.

To bridge this communication gap, Airbus developed the Wildfire Sentinel to replace isolated analog communications with a unified, AI-driven digital network. The framework ensures continuous, secure broadband connectivity and real-time tactical situational awareness for all deployed assets on the front line.

The Digital Brain Behind Wildfire Sentinel

The Wildfire Sentinel is not a single vehicle or aircraft, but rather an integrated digital bridge combining Airbus’ technology bricks across aircraft, communications, and flight operations with partner solutions.

Core Technologies and AI Integration

At the core of the system’s data exchange is the Airbus Agnet collaboration platform. The press release notes that Agnet provides secure and reliable broadband connectivity, even in environments where traditional mobile services are compromised or unavailable.

This network connects uncrewed aerial systems (UAS), helicopters, airplanes, and ground personnel into a single operational picture. It allows for the seamless sharing of geolocation data, live observation feeds, and an integrated database accessible to all stakeholders.

Furthermore, the framework utilizes an artificial intelligence-driven digital brain to process incoming data. This AI integration pushes optimized flight paths and exact drop coordinates directly to aircraft cockpit displays, removing the guesswork from aerial firefighting.

Proving the Concept: The Nîmes Trial

To prove the system’s efficacy in a real-world scenario, Airbus conducted a unique, full-scale trial in March 2026 at the Garrigues military camp in Nîmes, southern France.

Mobilized Assets and Operational Flow

The trial mobilized a diverse fleet of aerial and ground assets. According to Airbus, the operation included an Airbus H130 Flightlab helicopter, an ATR 72, a Cirrus SR20, and four drones prominently featuring the Airbus Aliaca UAS. On the ground, three firetrucks from the Departmental Fire and Rescue Service of Le Gard participated in the exercise.

During the trial’s operational flow, the Airbus Aliaca UAS flew high above a simulated ignition site, transmitting live infrared images directly to a mobile command unit on the ground. The Agnet platform secured the network connection and processed the data into actionable intelligence. Subsequently, the Airbus H130 Flightlab helicopter received optimized flight paths and exact drop coordinates directly on its cockpit display.

The trial successfully demonstrated highly accurate water drops executed just minutes after the simulated wildfire ignition.

“We connect aerial resources with ground assets using geolocation, observation data, and an integrated database accessible to all stakeholders. In this way, the firefighter commander no longer has to rely on fragmented radio calls,” stated Thierry Fol, Head of the Airbus Flightlab, in the company’s release.

Supporting Physical Assets

While the Wildfire Sentinel serves as the digital brain of the operation, Airbus continues to provide the physical muscle required for complex aerial firefighting. The digital system is designed to be fully interoperable with a global fleet of agile helicopters.

According to the provided specifications, this fleet includes the H125, a light, single-engine helicopter capable of carrying four firefighters and dropping 1,200 liters of water. The system also integrates with the versatile medium-sized H145, as well as the heavier H215 and H225 workhorse helicopters, which are specifically designed to operate in challenging weather conditions.

“Airbus’ ambition is to build an ecosystem that will answer the new challenges of managing wildfires in a more extreme environment,” noted Oliver Chalvet, Senior Manager for Firefighting Solutions at Airbus Defence and Space.

AirPro News analysis

At AirPro News, we observe that the transition from analog to digital firefighting represents a critical leap in disaster response. By eliminating the reliance on isolated units and fragmented radio communications, Airbus is addressing one of the most significant bottlenecks in wildfire suppression: response time. The ability to execute precise water drops within minutes of detection, as demonstrated in the Nîmes trial, could be the deciding factor in preventing localized sparks from escalating into devastating mega-fires. As climate change continues to fuel longer and more severe fire seasons, interconnected ecosystems like the Wildfire Sentinel will likely become standard operational requirements for global fire and rescue services.

Frequently Asked Questions

What is the Airbus Wildfire Sentinel?
The Wildfire Sentinel is a data-driven digital ecosystem developed by Airbus that interconnects drones, helicopters, fixed-wing aircraft, and ground crews to improve real-time communication and accelerate wildfire response times.

When and where was the system tested?
Airbus conducted a full-scale trial of the system in March 2026 at the Garrigues military camp in Nîmes, southern France.

What communication platform does the Wildfire Sentinel use?
The system relies on the Airbus Agnet collaboration platform, which provides secure and reliable broadband connectivity even when traditional mobile networks fail.

Sources

Photo Credit: Airbus

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Sustainable Aviation

AeroDelft Conducts First Hydrogen Aircraft Taxi Tests in Netherlands

AeroDelft’s student team completed the first hydrogen-powered aircraft taxi tests at Rotterdam The Hague Airport, advancing sustainable aviation.

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This article is based on an official press release from AeroDelft.

In late May 2026, the student-led engineering team AeroDelft achieved a significant milestone in sustainability aviation. According to an official press release from the organization, the team successfully conducted the first-ever taxi tests of a hydrogen-powered aircraft at an operational airport in the Netherlands. The tests took place at Rotterdam The Hague Airport (RTHA) and represent a critical transition from laboratory research to real-world application.

The comprehensive testing phase included hydrogen refueling operations, powertrain evaluations, and active taxi tests using gaseous hydrogen. By executing these procedures in a live commercial airport environment, AeroDelft and its partners gathered essential data on both the aircraft’s technological performance and the operational protocols required to safely handle hydrogen on an active tarmac.

This achievement is the culmination of extensive engineering and preparation. As noted in the team’s announcement, bringing a hydrogen aircraft to an operational airport required rigorous safety analyses, detailed operational planning, and close collaboration among multiple aviation and energy stakeholders.

Advancing Project Phoenix

From Laboratory to Tarmac

AeroDelft, a non-profit foundation run entirely by Delft University of Technology (TU Delft) students, has been developing “Project Phoenix” since 2018. According to supplementary research data, the initiative focuses on converting a Sling 4 airframe into a manned hydrogen-electric aircraft. Industry research highlights that in May 2025, AeroDelft became the first student team globally to test a full liquid hydrogen propulsion system in a lab setting, working alongside the Netherlands Organization for Applied Scientific Research (TNO).

Safety and Operational Planning

Operating an experimental aircraft at a commercial facility demands strict safety measures. According to project data, AeroDelft developed comprehensive risk analyses and an operational taxi test plan. This was achieved in close collaboration with research test pilots Alexander in ‘t Veld and Hans Mulder from TU Delft’s Flight Test Laboratory, ensuring that the live tests at RTHA’s Fieldlab Next Aviation facility met stringent aviation safety standards.

Technical Specifications and Infrastructure

Gaseous vs. Liquid Hydrogen

The recent taxi tests utilized gaseous hydrogen. While AeroDelft’s ultimate objective is to achieve flight using liquid hydrogen, gaseous hydrogen was selected for this phase due to its current technological maturity. Based on technical specifications provided in the research report, the single-seat converted aircraft uses a hydrogen fuel cell that combines hydrogen and oxygen to generate electricity, emitting only water. With a full tank of gaseous hydrogen, the aircraft is projected to have an endurance of approximately 40 minutes.

Transitioning to liquid hydrogen remains the next major technical hurdle. Because liquid hydrogen offers a significantly higher energy density by mass and volume, the team projects that utilizing liquid fuel will extend the aircraft’s flight endurance to approximately two hours. To achieve this, future development will require the integration of a cryogenic storage tank capable of maintaining temperatures at -253 °C, along with a complex distribution system.

The DutcH₂ Aviation Hub

The successful test campaign was facilitated by the DutcH₂ Aviation Hub, a collaborative ecosystem coordinated by the Rotterdam The Hague Innovation Airport (RHIA) Foundation and funded by the City of Rotterdam. The AeroDelft press release explicitly thanked partners including TU Delft Aerospace Engineering, RTHA, RHIA, and Air Products Benelux for their roles in turning months of preparation into a successful live test.

Perspectives on Sustainable Aviation

The transition to zero-emission aviation requires proving that new technologies are viable outside of controlled environments. Isha Moharir, Team Manager at AeroDelft, emphasized the importance of real-world testing in public remarks cited by industry reports:

“We want to demonstrate that flying on hydrogen works and that it’s safe in the air and at the airport… We are making absolutely no concessions on safety.”

Moharir further noted that testing at an operational commercial airport yields invaluable insights into the practical steps needed for sustainable aviation. Similarly, Daan van Dijk, an innovator at Rotterdam The Hague Airport, stated that these tests demonstrate tangible progress. According to research summaries, van Dijk highlighted that testing at an active airport is the exact method by which the aviation industry will learn to safely scale hydrogen-powered flight.

AirPro News analysis

We observe that while much of the aerospace sector’s attention has been focused on the in-flight capabilities of hydrogen aircraft, the logistical realities on the ground present an equally formidable challenge. The AeroDelft taxi tests at Rotterdam The Hague Airport serve as a crucial proof-of-concept for bridging the infrastructure gap. Traditional airports are optimized for kerosene; introducing hydrogen requires entirely new storage facilities, mobile refuelers, and emergency response protocols.

Furthermore, the broader hydrogen aviation race is accelerating. While battery-electric aviation propulsion shows promise for short-haul routes, the prohibitive weight of current battery technology limits its application for commercial passenger aviation. Liquid hydrogen presents a highly competitive alternative for longer ranges, provided that the cryogenic and logistical challenges, which initiatives like Project Phoenix are actively addressing, can be resolved at scale.

Frequently Asked Questions

What is Project Phoenix?
Project Phoenix is an initiative launched in 2018 by AeroDelft, a student-led team from TU Delft, aimed at developing a manned hydrogen-electric aircraft by converting a Sling 4 airframe.

Why did AeroDelft use gaseous hydrogen instead of liquid hydrogen for the taxi tests?
Gaseous hydrogen was used because it is currently a more mature and developed technology, allowing the team to safely test the powertrain and airport integration. The ultimate goal remains transitioning to liquid hydrogen for greater flight endurance.

Where did the taxi tests take place?
The tests were conducted at the Fieldlab Next Aviation facility located at Rotterdam The Hague Airport (RTHA) in the Netherlands.

Sources

Photo Credit: AeroDelft

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Technology & Innovation

EVIO and Molicel Partner to Develop Batteries for Hybrid-Electric Aircraft

EVIO and Molicel collaborate to develop lithium-ion batteries for the EVIO 810 hybrid-electric regional airliner, targeting prototype flight in 2029.

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On May 21, 2026, Montreal-based aerospace Startups EVIO and Taiwanese battery Manufacturers Molicel announced a Memorandum of Agreement (MOA) to jointly develop next-generation, high-energy-density lithium-ion battery cells. According to the official press release, this partnership is specifically tailored to meet the rigorous demands of aerospace applications, marking a significant step forward in the development of hybrid-electric commercial aviation.

The collaboration will center on maturing the energy storage system for the EVIO 810, a clean-sheet, 76-seat hybrid-electric regional airliner currently under development. By combining EVIO’s aircraft architecture with Molicel’s established battery technology, the two companies aim to ensure the aircraft meets strict power, safety, and certification requirements.

For the aviation industry, Partnerships between aerospace original equipment OEMs and specialized battery makers are critical. As we track the sector’s push toward decarbonization, overcoming the historical bottlenecks of battery energy density and weight remains the primary hurdle for Electric-Aviation.

Maturing Energy Storage for the EVIO 810

The newly signed MOA establishes a structured technical pathway for both companies. According to the announcement, the joint engineering teams will focus on validating cell performance and integrating the energy storage requirements specific to the EVIO 810. Molicel’s high-power cell technology is being engineered to handle the intense, high-stress discharge and recharge cycles that hybrid-electric flight demands.

“We’re pleased to announce this agreement with Molicel, whose high-power lithium-ion cell expertise, applied in high-performance aerospace and aviation applications, aligns well with EVIO’s exacting safety and performance standards. This MOA gives us a structured path to generate the data we need to mature an aircraft-ready energy storage solution for the EVIO 810.”
, Michael Derman, CEO of EVIO

The “Strong Hybrid” Approach

To understand the technical requirements of this battery development, it is essential to look at the EVIO 810’s operational profile. The press release details that the aircraft utilizes a “strong hybrid” architecture. Unlike “mild hybrid” concepts that merely use electricity to supplement conventional engines, the EVIO 810 is designed as an all-electric aircraft first, relying on turbine engines strictly as a secondary booster for range extension.

The aircraft is engineered to perform takeoffs and landings entirely on battery power, a feature intended to significantly reduce noise and emissions for communities surrounding regional airports. It is optimized for all-electric operation on short missions, while utilizing its hybrid-electric power system for longer routes of up to 500 nautical miles. EVIO expects the first flight of a production-conforming prototype in 2029, with customer deliveries targeted for the early 2030s.

Industry Pedigree and Market Impact

Both companies bring substantial industry backing to the partnership. EVIO emerged from stealth mode in December 2025 following eight years of research and development. The Canadian startup has already garnered technical support and investment from major aerospace players, including Boeing, Boeing Canada, and RTX’s Pratt & Whitney Canada. Upon its public launch, EVIO announced it had secured conditional purchase agreements and options for 450 aircraft from two unnamed airlines.

Molicel, formally known as E-One Moli Energy Corp., brings over 40 years of experience in manufacturing ultra-high-power lithium-ion battery cells. The company achieved AS9100 aerospace-grade quality certification in December 2024 and is already a recognized supplier in the advanced air mobility sector, providing cells for eVTOL developers such as Archer Aviation and Vertical Aerospace, as well as electric aircraft startup Vaeridion.

“Molicel is proud to support EVIO in pushing the boundaries of regional aviation. Our high-power cell technology is specifically engineered to handle the intense discharge and recharge cycles required for hybrid-electric flight. By combining our cell expertise with EVIO’s innovative 810 architecture, we are ensuring that the next generation of regional aircraft meets the highest standards of power, safety, and mission reliability.”
, Casey Shiue, President of Molicel

AirPro News analysis

We view this partnership as a strong indicator of the growing momentum behind Regional Air Mobility (RAM). Over the past few decades, short-haul regional routes have seen dwindling airline services, largely driven by the high operating costs and fuel burn of traditional turbine aircraft. By targeting these specific operational inefficiencies, companies like EVIO are attempting to make thin, short-haul routes economically viable once again.

Furthermore, with the commercial aviation industry facing mounting international pressure to decarbonize, hybrid-electric regional airliners serve as a vital, near-term stepping stone toward net-zero emissions. This is especially true for regional routes where sustainable aviation fuel (SAF) or hydrogen infrastructure are not yet economically or logistically feasible. Securing a reliable, aerospace-grade battery supply chain through partners like Molicel is a mandatory step for any OEM hoping to bring a hybrid-electric airframe to market in the next decade.

Frequently Asked Questions

What is the EVIO 810?

The EVIO 810 is a 76-seat hybrid-electric regional airliner currently in development by Montreal-based aerospace startup EVIO. It is designed to operate primarily on electric power, using turbine engines as a range extender for flights up to 500 nautical miles.

Who is Molicel?

Molicel (E-One Moli Energy Corp.) is a Taiwan-based manufacturer of ultra-high-power lithium-ion battery cells with over 40 years of industry experience. They hold AS9100 aerospace certification and supply batteries to several prominent electric aviation companies.

When will the EVIO 810 enter service?

According to EVIO’s development timeline, the first flight of a production-conforming prototype is expected in 2029, with initial customer deliveries targeted for the early 2030s.


Sources: EVIO and Molicel via Business Wire

Photo Credit: Molicel

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