U.S. Air Force Tests Pathfinder Subscale Model

• Northrop Grumman is poised to enhance BWB technology by leveraging its extensive expertise in mission systems integration
• JetZero has also made substantial progress at its integrated test facility
• JetZero announced its collaboration with key partners for the flight control systems

JetZero is presently engaged in the development of a subscale Blended-Wing Body (BWB) aircraft demonstrator, referred to as "Pathfinder." Concurrently, Northrop Grumman’s Scaled Composites division is responsible for the fabrication of the full-size aircraft and has already produced various test components to support the overall project.

The United States Air Force is systematically collecting data from flight tests of a subscale variant of its BWB demonstrator. This data is critical for informing the control software and final configuration of the full-scale aircraft. Recent updates provided by a spokesperson from the Air Force indicate that the project remains on schedule for its inaugural flight, which is projected for 2027.

The BWB initiative commenced following the selection of aerospace startup JetZero by the Department of the Air Force on August 16, 2023. Subsequently, JetZero introduced a 12.5% scale model of the future full-size aircraft in April 2024, notable for its wingspan of twenty-three feet, which reflects the innovative design objectives of the project.

The spokesperson noted that "Pathfinder" exhibits flight dynamics analogous to those of the previous BWB subscale project conducted by Boeing Phantom Works with the X-48. This correlation is significant as it builds upon the foundational research and insights achieved in earlier investigations.

BWB aircraft embody a hybridization of flying wing designs, like the B-2 Spirit, combined with conventional fuselage-and-wing configurations. This unique design approach facilitates more efficient use of internal space, enhancing payload capacity while simultaneously reducing aerodynamic drag. Consequently, this configuration enables a noteworthy reduction in fuel consumption, estimated at 30%. The anticipated financial and logistical advantages associated with BWB aircraft are expected to yield considerable benefits for both military operations and civilian air travel, underscoring the strategic importance of this initiative, which is directed by the Air Force Assistant Secretary for Energy, Installations, and Environment.

Under a cost-sharing agreement for the BWB program, the Air Force is set to invest $230 million, complemented by approximately $300 million in commitments from private investors. This partnership exemplifies the collaborative efforts between the public and private sectors in advancing aerospace technology. In addition, the Federal Aviation Administration granted airworthiness certification in March 2024, allowing the 1:8 scale aircraft to commence flight testing—a pivotal milestone in the project's progression.

Although the timeline for test flights was initially slated to begin in 2023, it has been postponed due to ongoing supply chain challenges. According to the revised schedule, fabrication of the full-scale aircraft is anticipated to occur in 2026, with ground testing beginning in April 2027 and the inaugural flight projected for September 2027. The subscale aircraft has completed initial flights at Crow’s Landing in California and is reported to have flight dynamics comparable to those of the X-48 subscale aircraft.

In the context of this project, JetZero is focused on the development of the subscale BWB aircraft, while Northrop Grumman’s Scaled Composites division is dedicated to producing the structural components of the full-size aircraft. As part of this effort, Scaled Composites has initiated the manufacturing of full-scale components for testing purposes, which is critical for validating design hypotheses. Notably, the company has constructed a wing test article intended to refine and validate the structural models for the full-scale aircraft, highlighting an initiative-taking approach to ensuring integrity and performance during the aircraft's operational lifecycle.

JetZero has also made substantial progress at its integrated test facility, enabling systems integration testing to occur well in advance of the full-scale manufacturing process. This capability is essential for ensuring that all systems operate synergistically before entering large-scale production.

The ongoing tests of the Pathfinder subscale demonstrator are essential for refining the flight control laws applicable to the larger demonstration aircraft. Furthermore, these flight tests will facilitate the validation of Computational Fluid Dynamics (CFD) models, and the assessment of performance characteristics related to the aircraft’s outer mould line, which are critical factors for achieving optimal aerodynamic efficiency.

Tom O’Leary, co-founder and CEO of JetZero, articulated that a primary technical challenge in this project is the pressurization of a non-cylindrical fuselage. He observed that traditional tube-shaped aircraft are better able to endure the stress associated with the cyclical expansion and contraction that occurs during flight operations. O’Leary explained that in a conventional tube-and-wing configuration, the loads are distinctly separated, with pressurization loads managed by the tube and bending loads primarily affecting the wings. In contrast, the blended-wing design integrates these loads, necessitating advanced materials technology to effectively manage the unique structural requirements of such an innovative aircraft.

Additionally, on November 4, 2024, JetZero announced its collaboration with key partners for the flight control systems of the full-scale BWB aircraft. Noteworthy participants, including BAE Systems, Moog, Thales, and Woodward, have been identified to provide essential components, such as Active Control Sidesticks, Flight Control Actuators, Pilot Controls, and Flight Control Computers.

Through its partnership with JetZero, Northrop Grumman is poised to enhance BWB technology by leveraging its extensive expertise in mission systems integration and rapid prototyping. This collaboration seeks to expand the boundaries of what is achievable for the Air Force, drawing upon decades of experience in advanced aircraft design, manufacturing, and digital engineering to ensure effective design, development, and long-term operational sustainability of the aircraft.

In conclusion, blended-wing body aircraft offer significant opportunities for addressing challenges anticipated in future military conflicts. The deployment of these aircraft is expected to empower the United States Air Force to develop and implement enhanced capabilities, thereby maximizing operational efficiency, extending mission endurance, and increasing overall capacity for a diverse range of future operations, enriching the landscape of military aviation.