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Reliable Robotics Advances ACAS Xu Flight Testing for FAA Certification

Reliable Robotics conducts extensive flight tests of ACAS Xu Detect and Avoid system near Hollister, California, supporting FAA certification efforts.

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This article is based on an official press release from Reliable Robotics.

Introduction to ACAS X Flight Testing

As the aviation industry pushes toward the integration of uncrewed aircraft systems (UAS) into the National Airspace System (NAS), advanced collision avoidance technologies are becoming critical. Reliable Robotics recently announced significant progress in this area, detailing a comprehensive flight test campaign for its Detect and Avoid (DAA) system. According to a company press release, this initiative is part of an ongoing contract with the Federal Aviation Administration (FAA) to provide validation data for certifying DAA systems based on the Airborne Collision Avoidance System X (ACAS X).

The testing focuses on ACAS Xu, a variant specifically designed for autonomous fixed-wing aircraft. By integrating this algorithm with air-to-air radar and other sensors, Reliable Robotics aims to create an FAA-certifiable DAA solution capable of operating under Instrument Flight Rules (IFR) across all airspace classes. This development marks a crucial step in ensuring that uncrewed aircraft can safely share the skies with traditional, piloted traffic.

Advancing ACAS X for Uncrewed Systems

The FAA has been developing the ACAS X family of algorithms to modernize and improve upon the legacy Traffic Alert and Collision Avoidance System II (TCAS II). The new suite includes several versions tailored to different aircraft types: ACAS Xu for fixed-wing UAS, ACAS Xr for rotorcraft, and ACAS Xa as a direct replacement for TCAS II in transport-category aircraft. The primary advantage of ACAS X is its ability to reduce unnecessary alerts, particularly in terminal areas, while enhancing overall safety and separation.

Reliable Robotics is leveraging the ACAS Xu variant as it works toward a Supplemental Type Certificate (STC) to convert the Cessna 208B Caravan into a fully uncrewed aircraft system. In their official statement, the company noted that their DAA solution will provide surveillance against both cooperative and non-cooperative traffic, a vital requirement for safe airspace integration.

Flight Test Campaign Details

Simulating Real-World Encounters

To validate the system, Reliable Robotics has transitioned from Hardware In The Loop (HITL) testing to a rigorous, month-long flight test campaign. The company reports that the campaign involves over 50 scripted encounters in and around the terminal area of the Hollister public airport (KCVH) in California.

During these tests, Reliable’s Cessna 208B (registration N927FE) flies RNAV approaches under the control of an advanced automation system, commanded by a remote pilot located 50 miles away. Simultaneously, an instrumented Cessna 182 acts as an “intruder” aircraft, flying converging paths to create specific encounter geometries. The encounters are meticulously planned to simulate a loss of safe separation while maintaining strict safety margins, particularly near the closest point of approach (CPA).

“Successful completion of each encounter requires meticulous planning, close communication between the remote pilot and intruder pilot, and precise execution,” Reliable Robotics stated in their release.

Testing Minimum Equipage Scenarios

A key component of the flight test campaign is evaluating the DAA system’s performance against aircraft with minimal cooperative equipment. The Cessna 182 intruder is outfitted with the minimum viable equipment set required for compliance with current FAA ADS-B OUT mandates, a configuration common among smaller, older general aviation aircraft.

Because ADS-B OUT relies on GPS data, its integrity must be independently validated. Reliable Robotics explains that Mode C omnidirectional interrogation is insufficient for this task. Instead, their system uses an integrated non-cooperative track source, such as radar, to validate the ADS-B tracks and provide complete positional data. This ensures that accurate collision avoidance alerts can be issued even when encountering minimally equipped traffic.

Regulatory and Financial Backing

The push for advanced collision avoidance technology has strong backing at the federal level. The FAA has been funding research and development for ACAS X since 2008. Furthermore, Reliable Robotics highlighted that the Senate Transportation, Housing and Urban Development, and Related Agencies’ draft appropriations bill for Fiscal Year 2026 allocates $16 million specifically for continued ACAS X development.

This sustained financial support underscores the growing focus on modernizing airspace safety technologies to accommodate new entrants without compromising the safety of existing NAS stakeholders.

AirPro News analysis

We view the successful validation of ACAS Xu through real-world flight testing as a major milestone for the UAS industry. By proving that uncrewed systems can reliably detect and avoid both cooperative and non-cooperative traffic, even those with minimal ADS-B equipage, companies like Reliable Robotics are dismantling one of the most significant technical barriers to routine beyond visual line of sight (BVLOS) operations. We note that the $16 million allocation in the FY 2026 draft appropriations bill further signals that lawmakers view ACAS X not just as an experimental project, but as foundational infrastructure for the future of the National Airspace System.

Frequently Asked Questions

What is ACAS X?
ACAS X (Airborne Collision Avoidance System X) is a family of collision avoidance algorithms developed by the FAA to replace and improve upon legacy TCAS II systems. It includes variants for transport aircraft, rotorcraft, and uncrewed systems.

What aircraft is Reliable Robotics using for these tests?
Reliable Robotics is using a Cessna 208B Caravan (N927FE) equipped with their DAA system, and a Cessna 182 acting as the intruder aircraft.

Where are the flight tests taking place?
The flight tests are being conducted in and around the terminal area of the Hollister public airport (KCVH) in California.

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Photo Credit: Reliable Robotics

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UAV & Drones

Valyra Aerospace Launches Hydrogen-Powered VTOL Drones in Spain

Valyra Aerospace, a UPV spin-off, develops hydrogen-powered VTOL drones with extended endurance for defense and maritime sectors in Spain.

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This article is based on an official press release from Universitat Politècnica de València (UPV).

Valyra Aerospace Emerges as UPV Spin-Off to Pioneer Hydrogen-Powered VTOL Drones

Valyra Aerospace has officially been recognized as a spin-off of the Universitat Politècnica de València (UPV), marking a significant milestone in the Spanish aerospace sector. According to the official university announcement, the company is positioning itself as one of the first in Spain to develop hydrogen-powered Unmanned Aerial Vehicles (UAVs) equipped with Vertical Take-Off and Landing (VTOL) capabilities. This technological approach aims to significantly outperform conventional battery and combustion engine systems by offering cleaner, longer-endurance flight profiles.

The transition to official spin-off status, achieved in early 2026, provides Valyra Aerospace with the institutional backing necessary to approach large governmental and industrial clients. The company is currently preparing to commercialize its first model, targeting critical applications in security, defense, and civilian maritime operations. By focusing on a “100% designed and built in Europe” philosophy, Valyra is aligning its product roadmap with the continent’s broader push for technological and defense sovereignty.

We at AirPro News have reviewed the comprehensive details provided by the UPV innovation ecosystem, which highlight not only the technical specifications of Valyra’s upcoming drone fleet but also the robust academic pipeline that brought the company to life.

From Student Project to Aerospace Innovator

The Origins in Horus UPV

The foundation of Valyra Aerospace traces back to 2018, originating as a student-led initiative named “Horus UPV.” As detailed in the university’s release, this project was incubated within UPV’s Generación Espontánea (Spontaneous Generation) program, an initiative designed to foster student-driven technological innovation. The company is spearheaded by three UPV alumni: Co-CEO Joan Albert Such García and José Domingo Cerdán Torres, both holding Master’s degrees in Aeronautical Engineering, alongside Mario Sepúlveda Sánchez, who holds a Master’s in Automatics and Industrial Informatics.

Academic and Institutional Backing

The evolution from a student concept to a commercially viable enterprise was heavily supported by the university’s academic staff. Two prominent UPV professors serve as main partners in the spin-off: Sergio García-Nieto Rodríguez from the University Institute of Control Systems and Industrial Computing (ai2-UPV), and Luis Miguel García-Cuevas González from the CMT-Clean, Mobility & Thermofluids Institute (CMT-UPV). This collaboration underscores the successful technology transfer from academia to the private sector.

“Valyra is more than a startup or a spin-off; it is already an exemplary company of convergence between the Generación Espontánea programs and company generation. It will be a benchmark and I am sure it will generate many other successful companies.”

, José E. Capilla, Rector of UPV, as quoted in the university press release.

Pioneering Hydrogen-Powered VTOL Technology

The VX Series and Technical Specifications

Valyra’s primary technological differentiator is its integration of hydrogen fuel cells into VTOL platforms. According to the provided specifications, this propulsion method allows their UAVs to achieve extended flight times and reduced emissions, making them highly suitable for sustainable, long-range operations where traditional electric batteries fall short. The VTOL capability eliminates the need for runways, enabling rapid deployment in constrained or harsh environments, such as offshore platforms and moving vessels.

The company’s flagship model is the VX-110, designed for sustainable, long-endurance operations at sea or on land. Additionally, the modular Series VX is tailored for aerospace research and innovation. The university’s announcement notes that the Series VX features a Maximum Take-Off Weight (MTOW) of 20 kg, a 3-meter wingspan, a 4 kg payload capacity, and a cruising speed of 75 km/h.

Target Markets: Defense and Civilian Applications

While the initial design focus leans toward military and governmental use, the modular architecture of Valyra’s UAVs ensures adaptability across various sectors. In the defense and security realms, the drones are targeted for Intelligence, Surveillance, and Reconnaissance (ISR) missions, naval operations, border control, anti-drug trafficking, and maritime rescue. On the civilian and commercial front, the technology is positioned for the surveillance of energy infrastructure, such as offshore wind farms and oil platforms, as well as environmental monitoring and maritime logistics.

Recent Milestones and European Sovereignty

ESA Incubator and Industry Recognition

Valyra Aerospace has rapidly accumulated significant industry validation. Following its participation in the SPIN UPV program, which structured its technology transfer, the company achieved its official spin-off status. Furthermore, on March 31, 2026, Valyra was selected to participate in the second edition of the European Space Agency (ESA) business incubator project at Castellon Airport. This follows earlier recognition in late 2025, when the specialized defense magazine Escudo Digital named Valyra as one of the 10 startups expected to shape the future of security and defense in Spain.

“The aim now is to show our clients that we’re not just selling hot air… In an environment like ours, where you need the support of as many institutions as possible, going from a startup to a spin-off gives you credibility. It gives you that seal of approval that allows you to approach large governmental or industrial clients, collaborators, and suppliers with greater solvency.”

, Joan Albert Such, Co-CEO of Valyra Aerospace, via the UPV announcement.

AirPro News analysis

The emergence of Valyra Aerospace highlights a critical transition in the unmanned aerial systems market: the shift toward hydrogen propulsion to solve the endurance limitations of battery-powered VTOLs. Lithium-ion batteries remain heavy and offer diminishing returns for long-range maritime and ISR missions. By successfully integrating hydrogen fuel cells into a 20 kg MTOW platform, Valyra is addressing a distinct operational gap for European defense and infrastructure monitoring.

Furthermore, the company’s success is a testament to the robust innovation pipeline within the Spanish university system. The UPV’s IDEAS program has reportedly helped create over 1,033 startups since 1992, maintaining a historical survival rate of 66.4%. With UPV breaking its historical record for R&D&I project revenue in 2025 at €119 million, the institutional framework supporting deep-tech hardware startups in Spain appears stronger than ever. Valyra’s emphasis on a European supply chain also perfectly times the market, as EU nations increasingly prioritize domestic sourcing for critical defense and aerospace technologies.

Frequently Asked Questions (FAQ)

What makes Valyra Aerospace drones different from standard commercial drones?

According to the company’s specifications, Valyra drones utilize hydrogen fuel cells rather than standard lithium-ion batteries or combustion engines. This provides significantly longer flight endurance and cleaner operations, combined with Vertical Take-Off and Landing (VTOL) capabilities for runway-independent deployment.

What are the specifications of the Valyra Series VX?

The UPV press release states that the Series VX features a 20 kg Maximum Take-Off Weight (MTOW), a 3-meter wingspan, a 4 kg payload capacity, and a cruising speed of 75 km/h.

What is a university spin-off?

A spin-off is a company founded to commercialize technology or research developed within a university. In this case, Valyra Aerospace transitioned from a student project (“Horus UPV”) into a commercial entity with the official backing and technology transfer support of the Universitat Politècnica de València.


Sources: Universitat Politècnica de València (UPV)

Photo Credit: Universitat Politècnica de València

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UAV & Drones

Open-Source Bamboo Drone Flight Control Software Released by Chinese Researchers

Chinese researchers developed the first open-source flight control system for bamboo drones, tackling vibration issues and promoting sustainable UAVs.

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This article summarizes reporting by the South China Morning Post and journalist Dr. Chao Kong. This article summarizes publicly available elements and public remarks.

World’s First Open-Source Bamboo Drone Flight Control Software Released by Chinese Researchers

A research team from China has successfully developed and released the world’s first open-source flight control system engineered specifically for bamboo-frame drones. According to reporting by the South China Morning Post, this breakthrough overcomes the unique physical and aerodynamic challenges associated with using natural, flexible materials in aviation.

The innovation, spearheaded by researchers at the School of Civil Aviation at Northwestern Polytechnical University, was initially detailed in the academic journal Heilongjiang Science on February 28, 2026, before gaining global attention in early April. By making the software freely available, the developers aim to accelerate the creation of sustainable, low-cost unmanned aerial vehicles (UAVs) that can serve as viable, eco-friendly alternatives to traditional plastic and carbon-fiber models.

For the commercial drone industry, this represents a significant step toward sustainable aviation. As we observe a growing global demand for green technology, the democratization of drone manufacturing could empower developing nations, agricultural sectors, and environmental monitoring groups to deploy highly capable fleets using locally sourced, biodegradable materials.

Engineering the Bamboo Drone

Overcoming Low-Frequency Vibrations

The physics of bamboo present a unique hurdle for aerospace engineers. Traditional UAVs rely on rigid composite materials, whereas bamboo is inherently flexible. According to the South China Morning Post, this flexibility generates distinct low-frequency vibrations during flight, typically measuring between 8 and 20 hertz.

Conventional commercial flight controllers are designed for rigid frames and struggle to process these specific low-frequency vibrations. Historically, this technological bottleneck has prevented the mass industrial adoption of bamboo drones. Existing closed-source controllers, and even many open-source alternatives, are inadequately adapted to the structural properties of natural materials, leading to instability in the air.

Hardware and Software Upgrades

To solve this stability issue, the Northwestern Polytechnical University team engineered a bespoke flight control board. The hardware features an industrial-grade chip paired with a dual inertial measurement unit (IMU) system, as detailed in the Heilongjiang Science publication. This dual-sensor approach provides the necessary redundancy and noise filtering required to manage a flexible airframe.

On the software side, the researchers utilized a refined “extended Kalman filter.” The performance metrics reported by the research team are notable: the new bamboo-optimized system reduces control latency to 8–10 milliseconds, a significant improvement over the 15–20 milliseconds typical of conventional systems.

According to the South China Morning Post, the open-source software “is specifically coded to exploit bamboo’s natural vibration-damping qualities,” significantly enhancing drone stability.

Broader Implications for Sustainability and Industry

Eco-Friendly Aviation

The commercial drone sector currently relies heavily on non-biodegradable plastics, carbon composites, and rare earth metals. Bamboo offers a highly renewable, fast-growing, and biodegradable alternative for drone airframes. By shifting toward natural materials, the industry could drastically reduce the environmental footprint of manufacturing and disposing of commercial UAV fleets.

Furthermore, by releasing the flight control software as an open-source platform, the Chinese team is removing a massive financial and technical barrier. This move has the potential to democratize drone technology globally, allowing various sectors to build low-cost UAVs without relying on expensive, proprietary components.

AirPro News analysis

At AirPro News, we view this development as a fascinating intersection of ancient materials and modern algorithms. However, it is crucial to place this innovation within the current geopolitical landscape. The global drone market is currently experiencing intense international scrutiny regarding Chinese-manufactured UAVs.

Concerns over data privacy and cybersecurity have led several Western nations to reassess their procurement policies regarding Chinese technology. Releasing this bamboo drone software as a free, open-source platform may serve as a strategic maneuver. By fostering global goodwill and encouraging international collaboration, developers might successfully bypass the commercial and geopolitical restrictions frequently placed on proprietary Chinese aerospace technology, ensuring their innovations still shape the global market.

Frequently Asked Questions (FAQ)

Who developed the bamboo drone flight control software?
The system was developed by a research team at the School of Civil Aviation at Northwestern Polytechnical University in China, with findings published in the journal Heilongjiang Science.

Why do bamboo drones need special software?
According to researchers, bamboo is flexible and generates low-frequency vibrations (8 to 20 hertz) during flight. These vibrations confuse standard flight controllers designed for rigid plastic or carbon-fiber drones, requiring specialized algorithms to maintain stability.

How much does the software cost?
The flight control software has been released for free as an open-source platform to encourage global development and adoption.

Sources: South China Morning Post, Heilongjiang Science

Photo Credit: South China Morning Post

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UAV & Drones

Honeywell and Odys Aviation Develop Airborne Counter-UAS Defense Solution

Honeywell Aerospace and Odys Aviation partner to deploy the SAMURAI system on Laila UAV, enhancing airborne defense for critical infrastructure with extended range and endurance.

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This article is based on an official press release from Honeywell Aerospace.

Honeywell Aerospace and Odys Aviation have announced a strategic collaboration to develop and deliver a persistent airborne counter-unmanned aerial system (C-UAS) defense solution. The partnership aims to protect critical infrastructure and strategic assets from rapidly evolving Drones threats.

According to the official press release, the joint effort integrates Honeywell’s Stationary and Mobile UAS Reveal and Intercept (SAMURAI) platform onto Odys Aviation’s long-range Laila unmanned aerial vehicle (UAV). This integration is designed to introduce a new defensive layer that sits between traditional ground-based sensors and high-end missile defense systems.

By deploying this technology, the companies intend to reduce reliance on costly kinetic defenses while extending protection coverage across vast and remote areas. The solution is particularly targeted at distributed energy infrastructure, including refineries, pipelines, and offshore production platforms.

Advancing Airborne Defense Capabilities

The Laila-SAMURAI Integration

The collaboration builds on more than a year of joint development and systems integration work, as stated in the company announcement. The Laila UAV will serve as the first airborne application of the Honeywell SAMURAI system. Built using model-based systems engineering, SAMURAI provides a modular solution compliant with Modular Open Systems Approach standards, which supports long-term sustainment and interoperability.

The press release notes that the Laila drone features a Propulsion system compatible with Jet A, Jet A-1, and JP-8 fuels. The companies report that the aircraft produces enough power to remain in flight for up to eight hours, covering a 450-mile range. Because it eliminates the need for dedicated charging infrastructure, the UAV enables rapid deployment in remote, expeditionary, and offshore environments.

Strategic Importance for Critical Infrastructure

The joint solution supports the broader United States national strategy to strengthen domestic leadership in advanced aviation and accelerate the deployment of American-built drone technologies. Protecting distributed assets requires systems that can operate continuously without frequent downtime.

“SAMURAI delivers critical counter-UAS capabilities with proven reliability, scalability and seamless integration into existing defense architectures. By leveraging Honeywell’s long history in avionics, sensors and defense systems, we are enabling C-UAS capabilities that protect farther, respond faster and operate with minimal downtime.”

Matt Milas, president of Defense and Space at Honeywell Aerospace, highlighted the system’s operational advantages in the official release.

Industry Impact and Future Outlook

Odys Aviation’s Role

Odys Aviation, a dual-use aerospace company based in Long Beach, California, was launched in 2021. Led by engineers and strategists from major aerospace and defense organizations, the company reports having more than $11 billion in signed letters of intent to date. Their focus remains on hybrid-electric vertical take-off and landing (VTOL) aircraft.

“Critical infrastructure and forward-operating locations require persistent protection across large areas and the ability to engage threats at the horizon long before they’re at the doorstep.”

James Dorris, CEO of Odys Aviation, emphasized the changing economics of air defense in the press release, noting that combining SAMURAI with Laila’s endurance introduces a vital new airborne defense layer.

AirPro News analysis

We note that the integration of counter-drone technology onto long-endurance UAVs represents a significant shift in infrastructure protection strategies. As drone threats become more sophisticated and asymmetric, relying solely on ground-based or traditional kinetic defenses is increasingly cost-prohibitive and geographically limiting. By utilizing hybrid-electric VTOL aircraft with multi-fuel compatibility, defense contractors are prioritizing operational flexibility and runway independence. This approach is crucial for expeditionary military forces and remote commercial applications alike, ensuring that defensive perimeters can be pushed further out without requiring massive logistical footprints.

Frequently Asked Questions

What is the Laila-SAMURAI system?

It is a joint counter-drone defense solution that combines Honeywell’s SAMURAI autonomous airborne platform with Odys Aviation’s Laila UAV to protect critical infrastructure.

What is the flight range of the Laila UAV?

According to the companies’ press release, the Laila UAV can fly for up to eight hours and has a 450-mile range.

What type of fuel does the Laila UAV use?

The aircraft’s hybrid propulsion system is compatible with Jet A, Jet A-1, and JP-8 fuels, eliminating the need for dedicated electrical charging infrastructure.

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Photo Credit: Honeywell Aerospace

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