DARPA X-65 Experimental Drone Reaches Wing Installation Milestone, Active Flow Control Technology Targets First Flight in 2026

Aurora Flight Sciences has announced that the X-65 experimental aircraft—the centerpiece of DARPA's revolutionary flight control research program—has formally completed wing installation. The milestone marks a significant step forward for an experimental drone that uses high-pressure airflow instead of conventional control surfaces to execute flight maneuvers, a technology that could have far-reaching implications for both military and civilian aircraft design, particularly stealth platforms.

Background: The CRANE Program

The X-65 is the product of DARPA's Control of Revolutionary Aircraft with Novel Effectors (CRANE) program, which was formally launched in 2020. DARPA subsequently selected Aurora Flight Sciences—a Boeing subsidiary—to advance the design and development effort on its own. Aurora entered the program's latest phase in 2024, with a current goal of achieving first flight in 2026. The CRANE program has experienced several delays and cost increases over the years.

Wings Arrive, Integration Underway

Aurora Flight Sciences posted on its official X (formerly Twitter) account: "The wings have arrived—the next major milestone for X-65! The wings were built at our West Virginia facility; the delta design enables Active Flow Control testing across multiple sweep angles. Integration is now underway in Virginia as we push toward the first flight goal for @DARPA's CRANE program."

In November 2025, Aurora also announced progress on the construction of the fuselage mid-section. Prior to that, the company completed wind tunnel testing of a scaled model and conducted digital simulation modeling across various phases of the CRANE program.

X-65's Distinctive Design

The X-65 features a Co-Planar Joined Wing (CJW) configuration, in which two sets of wings connect at their tips to form triangular profiles on either side of the fuselage, with small tip extensions that bring the total wingspan to 30 feet (approximately 9.1 meters). The fuselage incorporates twin vertical tails, an inlet beneath the nose, and a single exhaust nozzle. The X-65's gross weight is approximately 7,000 pounds (approximately 3,175 kg).

Core Technology: Active Flow Control (AFC)

The X-65's most distinctive feature is its array of Active Flow Control (AFC) effectors, which achieve roll, pitch, and yaw through jets of high-pressure air—fundamentally departing from the conventional fixed-wing approach of physically deflecting control surfaces.

According to an Aurora press release from last year: "The AFC system supplies pressurized air to 14 AFC effectors distributed across all flying surfaces. The delta wing design enables testing at multiple sweep angles, and the modular design allows outer wing panels and AFC effectors to be swapped out for future testing of alternative AFC configurations."

A 2024 DARPA press release noted: "The X-65 will be equipped with two sets of control actuators—conventional flaps and control surfaces, as well as AFC effectors embedded in all lifting surfaces. This approach both reduces risk and maximizes the program's ability to study control effectiveness. Conventional control surface performance will serve as a baseline, with subsequent tests progressively locking out the moving surfaces so AFC effectors can take over."

Dr. Richard Wlezien, former DARPA CRANE program manager, stated: "The X-65's conventional control surfaces are like training wheels, helping us understand how AFC can replace traditional flaps and control surfaces. We will deploy sensors to monitor the performance comparison between AFC effectors and conventional control mechanisms—data that will deepen our understanding of how AFC could revolutionize both military and commercial aircraft in the future."

He added: "We've built the X-65 as a modular platform—wing panels and AFC effectors can be readily swapped—allowing it to serve as a long-term test asset for DARPA and other organizations well beyond the conclusion of the CRANE program."

Potential Advantages of AFC Technology

Eliminating conventional moving control surfaces offers several potential benefits:

• Improved aerodynamic efficiency: A cleaner design with enhanced performance, particularly at altitude
• Weight reduction: Elimination of the actuators and linkages required to drive control surfaces
• Enhanced maneuverability: A lighter, cleaner airframe can improve agility, especially for unmanned platforms
• Reduced failure rates: Fewer moving parts translates to greater reliability, improved safety, and lower maintenance requirements
• Improved stealth performance: For stealth aircraft designers, the seams and joints created by conventional control surfaces have long posed an unavoidable radar cross-section (RCS) problem; AFC technology has the potential to fundamentally address this limitation

Program Delays and Funding Status

As noted, the CRANE program has experienced multiple delays. The original first-flight target was 2025, but according to a November 2025 report by Defense News, "the manufacturing cost of the flight-test prototype exceeded expectations," prompting DARPA to "strategically pause" X-65 development and reassess the program. Aurora has confirmed that technical challenges, supply chain issues, and the inherently high-risk nature of a DARPA program have all contributed to the delays.

It is worth noting that AFC technology has been tested before. UK defense firm BAE Systems tested a scaled AFC demonstrator called MAGMA in the 2010s, and the company also submitted a design proposal for the CRANE program.

Pentagon budget documents show that since the program entered Phase 3 in fiscal year 2024, DARPA has received approximately $63 million in funding for the CRANE program. DARPA has not requested additional funding for fiscal year 2027, suggesting the program is expected to conclude before the end of next year.

Outlook

Larry Wirsing, Aurora's Vice President of Aircraft Development, said: "We are pleased to continue our long-term collaboration with DARPA to complete the X-65 and demonstrate active flow control capability in flight. The X-65 platform will serve as an enduring flight test asset, and we are confident that future aircraft design and research missions will make full use of the underlying technology and flight test data."

With the wings now installed, the X-65 experimental drone continues to take shape. Aurora and DARPA are pressing forward together toward the first flight milestone, as this revolutionary airflow control technology moves closer to taking to the skies.

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