Whisper Aero has successfully completed the first crewed flight tests of its eQ250 electric ducted fans, achieving a Technology Readiness Level greater than 7 and clearing the path for integration into upcoming Military-Aircraft and civil aircraft programs.

The mid-August 2026 test campaign took place at Crossville Memorial Airport (KCSV) in Tennessee. According to official statements released on August 19, 2026, by Whisper Aero and the Tennessee Department of Economic and Community Development, the flights validated the ultra-quiet acoustic signature of the propulsion system in real-world conditions.

Flight test campaign and acoustic performance

The test vehicle, designated the Whisper Powered Swift, is a modified Aériane Swift 3 glider with a 46-foot wingspan. Whisper Aero retrofitted the airframe with two 10-inch eQ250 propulsors, each capable of producing up to 85 pounds of static thrust. Power was supplied by five Electric Power Systems EPiC 1.0 battery modules.

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Test pilot Zac Majors conducted three flights totaling more than 130 minutes in the air. The crewed flights followed a phased testing progression that included progressively ballasted glider flights, aircraft integration testing, formal readiness reviews, and more than 1,000 hours of ground-based Propulsion life testing.

Acoustic measurements taken during early morning flights demonstrated the low noise profile of the eQ250 fans. With an ambient noise level of 34 dB(A), the aircraft produced only 52 dB(A) while flying at an altitude of 100 feet.

“Any new technology needs strong proof points. This is a very strong proof point. These propulsors are absolutely as quiet as we said they are.”

Whisper Aero Chief Executive Officer Mark Moore noted that adding the propulsors to a glider allowed the company to demonstrate that the engines at full throttle add virtually no noise to the baseline acoustic signature of the airframe.

Chief Operating Officer Ian Villa detailed the regulatory and safety steps preceding the flights. The company processed the modifications through its AS9100 quality management system and secured a special airworthiness certificate from the Federal Aviation Administration (FAA) before commencing the powered flight phase.

Defense applications and future development

Reaching Technology Readiness Level (TRL) 7 indicates that the eQ250 propulsors have been demonstrated in an operational environment and are ready for deployment on partner aircraft. Whisper Aero is currently involved in multiple defense programs that will utilize this propulsion technology.

In June 2026, the US Defense Innovation Unit (DIU) awarded a Contracts to Mach Industries and Whisper Aero for the Runway Independent Maritime Expeditionary Strike (RIMES) program. The companies are co-developing a hybrid-electric prototype aircraft named Atlas, which is designed to launch from ships lacking large flight decks.

Whisper Aero is also under contract with the US Air Force to develop the Collaborative Logistics Aircraft (CLA). This family of autonomous aircraft is intended for contested logistics operations, with initial testing scheduled for 2027.

The recent flight tests in Tennessee were supported by a $500,000 Transportation Network Growth Opportunity grant awarded to Tennessee Tech University by the Tennessee Department of Economic and Community Development in April 2025. Following the successful flights in Crossville, Whisper Aero plans to conduct further acoustic measurement tests and evaluations with government customers at White Sands Missile Range in New Mexico later this year.

AirPro News analysis

We view the use of a modified glider as a highly effective method for isolating propulsion noise during acoustic testing. By establishing a baseline with the unpowered Aériane Swift 3, Whisper Aero generated clean data proving that the eQ250 fans do not significantly increase the airframe’s overall noise footprint. Achieving TRL 7 is a critical milestone for any aerospace Startups, as it transitions the technology from experimental status to a viable product for integration. The immediate application of these propulsors in the DIU RIMES and USAF CLA programs highlights the strong demand for low-acoustic-signature propulsion in military logistics and expeditionary roles.

Sources: Whisper Aero

Saab AB unveiled a full-scale concept model of a supersonic, low-observable uncrewed combat air system, designated the A3-001, during the Jubilee Air Show at Malmen Air Base in Linköping, Sweden, on August 22, 2026.

The presentation, which coincided with the 100th anniversary of the Swedish Air Force, outlines the manufacturers vision for a high-end autonomous platform designed to operate alongside crewed fighters like the Saab Gripen E. According to a company press release, the A3-001 is intended for high-risk missions in heavily defended airspace, including electronic warfare, suppression of enemy air defenses (SEAD), and precision strikes.

Pathway to the A3-001 concept

While the A3-001 represents a future operational vision targeted for the mid-2030s, Saab is currently developing two uncrewed technology demonstrators, designated A1 and A2, under its Autonomous Collaborative Platform (ACP) roadmap. These initial demonstrators are funded by the Swedish Ministry of Defence.

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Reporting by The War Zone indicates that the A1 demonstrator is expected to make its first flight within approximately 15 months. The A1 will be powered by a General Electric (GE) F414 engine, which is the same powerplant utilized in the Gripen E and F models.

“We are currently in an intensive development phase where, together with Sweden, we are exploring technologies that will lay the foundation for the next generation of combat air systems,” said Peter Nilsson, Head of Business Unit Advanced Programs at Saab AB. “As part of this work, we intend to fly uncrewed demonstrators with fighter-like characteristics before 2030 as we support Sweden in considering their future options.”

Strategic positioning and future combat systems

The A3-001 concept falls under Sweden’s broader Koncept för Framtida Stridsflygplan (KFS), or Concept for Future Combat Aircraft project. The War Zone notes that the A3-001 is positioned as a higher-end, larger, and faster platform compared to the Collaborative Combat Aircraft (CCA) currently under development for the United States Air Forces.

Saab intends for the A3-001 to leverage the company’s existing sensor and command infrastructure. Nilsson stated that the A3 system is a concept for what could follow the demonstrator phase should the Swedish government decide to proceed with development.

“Saab is well positioned to develop the next generation of combat air systems building on Gripen and GlobalEye, combined with our long experience in advanced aerospace systems,” Nilsson said.

AirPro News analysis

We view Saab’s decision to power the near-term A1 demonstrator with the GE F414 engine as a pragmatic approach to reducing developmental risk. By utilizing the same propulsion system as the Gripen E, Saab ensures immediate logistical and maintenance commonality, which is critical for testing manned-unmanned teaming concepts. It is necessary to distinguish between the funded A1 and A2 demonstrators and the A3-001 mock-up showcased on August 22, 2026. The A3-001 remains a company-funded concept illustrating potential future capabilities rather than an active acquisition program. Its realization will depend entirely on future procurement decisions by the Swedish Armed Forces following the data gathered from the A1 and A2 flight test campaigns.

Sources: Saab AB

This article is based on an official press release from Aurora Flight Sciences, supplemented by industry research data.

Aurora Flight Sciences, a Boeing subsidiary, has announced a critical milestone in the development of the X-65 experimental aircraft. According to an official company update, the X-65 fuselage has officially arrived at the company’s Virginia facility, marking the transition from major structural assembly to the final systems integration phase. Our teams at AirPro News have been tracking this development, which represents a significant step forward for the Defense Advanced Research Projects Agency (DARPA) CRANE program.

The CRANE (Control of Revolutionary Aircraft with Novel Effectors) program is designed to test Active Flow Control (AFC) technology. This experimental approach aims to replace traditional mechanical flight control surfaces, such as flaps, rudders, and ailerons, with pressurized jets of air. The successful integration of these systems could fundamentally alter aircraft design paradigms that have been in place since the dawn of aviation.

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While the fuselage undergoes electrical, propulsion, and AFC systems integration in Virginia, Aurora Flight Sciences confirmed that manufacturing of the wing and tail assemblies is advancing concurrently at their facility in Bridgeport, West Virginia. Following a series of program restructurings, the X-65 is currently slated for its first flight in late 2027.

The Shift to Active Flow Control

Since the Wright Brothers’ first flight, aircraft have relied on moving external panels to steer and maintain stability. The X-65 demonstrator seeks to break this century-old paradigm. Based on DARPA program outlines, the aircraft utilizes 14 distinct effectors embedded across its flying surfaces. Instead of relying on mechanical hinges, these effectors emit steady bursts of pressurized air generated by an onboard auxiliary power unit.

How the X-65 Implements AFC

By manipulating the airflow over the aircraft’s surface, these pressurized jets create aerodynamic “speed bumps” that alter the plane’s pitch, roll, and yaw. To minimize risk during initial testing, the X-65 will be equipped with both conventional moving control surfaces and the experimental AFC actuators.

“The X-65 conventional surfaces are like training wheels to help us understand how AFC can be used in place of traditional flaps and rudders.”

This phased testing strategy, as described by former DARPA CRANE Program Manager Dr. Richard Wlezien, ensures a safe baseline. During successive flight tests, the mechanical controls will be selectively locked down until the aircraft is maneuvering entirely via Active Flow Control.

Manufacturing Progress and Revised Timelines

The transition of the fuselage to the Virginia facility represents a tangible shift from theoretical design to physical integration. However, the journey to this stage has required significant program adjustments. Originally scheduled to roll out and fly in 2025, the X-65 timeline was officially revised to a late 2027 first flight target.

Overcoming Supply Chain and Budget Hurdles

Industry research and DARPA statements indicate that the delay was driven by a combination of engineering challenges, supply chain bottlenecks, and rising costs. DARPA CRANE Program Manager Chris Kent noted the realities of the manufacturing environment.

“We were working through several engineering issues as well as honest-to-goodness supply chain issues,” stated Kent regarding the revised timeline.

To keep the program on an executable path, DARPA and Aurora Flight Sciences finalized a “co-investment” agreement in August 2025. Under this restructured framework, Aurora is investing its own capital to cap costs for the U.S. government. According to Department of Defense FY2026 budget estimates, Aurora was initially awarded a $42 million contract in January 2023. DARPA’s spending on the CRANE program was recorded at $38.3 million in FY2024 and $23.9 million in FY2025, with a projected $4 million allocated for FY2026.

Aircraft Specifications and Future Implications

The uncrewed X-65 is designed to provide flight-test data that is immediately relevant to real-world aircraft design. According to published program specifications, the aircraft features a 30-foot wingspan, a gross weight exceeding 7,000 pounds, and a distinctive, modular diamond-like wing shape. It is capable of reaching speeds up to Mach 0.7 (approximately 463 knots). The modularity of the wings allows sections and AFC effectors to be easily swapped out for future aerodynamic testing.

“The X-65 platform will be an enduring flight test asset, and we’re confident that future aircraft designs… will be able to leverage the underlying technologies,” noted Larry Wirsing, VP of Aircraft Development at Aurora.

AirPro News analysis

We view the successful implementation of Active Flow Control as a potential watershed moment for both military and commercial aviation. By eliminating heavy mechanical hinges, hydraulic actuators, and moving parts, manufacturers can significantly reduce an aircraft’s overall weight and mechanical complexity. This naturally leads to lower maintenance costs and improved fuel efficiency.

Furthermore, from a defense perspective, the tactical advantages are substantial. Maneuvering an aircraft without moving control surfaces means the outer mold line of the aircraft remains entirely static during flight. We assess that this capability could drastically reduce an aircraft’s radar cross-section, offering major advancements in stealth technology and survivability for next-generation fighter jets and unmanned aerial systems.

Frequently Asked Questions

What is the X-65?

The X-65 is an experimental, uncrewed aircraft developed by Aurora Flight Sciences for DARPA’s CRANE program. It is designed to test Active Flow Control (AFC) technology.

What is Active Flow Control (AFC)?

AFC is a technology that replaces traditional moving flight control surfaces (like flaps and rudders) with pressurized jets of air to steer and maneuver the aircraft.

When will the X-65 fly?

Following program restructurings and supply chain delays, the X-65 is currently targeted for its first flight in late 2027.

Sources

• Aurora Flight Sciences