Military Technology
Hermeus Flies Quarterhorse Mk 2.1 Advancing Hypersonic Tests
Hermeus completed the first flight of its Quarterhorse Mk 2.1, validating key systems and progressing toward supersonic capabilities.

This article is based on an official press release from Hermeus and additional industry data.
Hermeus Completes First Flight of Quarterhorse Mk 2.1, Accelerating Hypersonic Roadmap
On March 2, 2026, Atlanta-based aerospace company Hermeus successfully conducted the first flight of its Quarterhorse Mk 2.1 aircraft at Spaceport America in New Mexico. This milestone marks the company’s second debut of a new vehicle type in just nine months, following the flight of the Quarterhorse Mk 1 in May 2025. The event underscores Hermeus’s commitment to a “hardware-rich” development strategy, prioritizing rapid iteration and physical testing over purely simulation-based engineering.
According to the company’s announcement, the mission was a remotely piloted “shakedown” sortie. The aircraft took off from runway 16/34, flew a predetermined pattern to validate stability, control, and subsystems, and executed a successful landing. While this initial flight remained subsonic, it serves as the foundation for a test campaign designed to push the vehicle past Mach 1 in the near future.
Technical Leap: From Mk 1 to Mk 2.1
The Quarterhorse Mk 2.1 represents a significant escalation in capability compared to its predecessor. While the retired Mk 1 was a smaller demonstrator powered by a GE J85 turbojet, the Mk 2.1 is approximately three times larger and four times heavier, roughly the size of an F-16 fighter jet.
Key technical specifications confirmed by Hermeus include:
- Propulsion: Powered by a Pratt & Whitney F100-229 turbofan engine, the same core used in F-15 and F-16 fighters.
- Aerodynamics: Features a delta wing design optimized for higher speeds, replacing the conventional straight wing of the Mk 1.
- Inlet Design: The Mk 2.1 utilizes a simple pitot inlet. The subsequent iteration, Mk 2.2, is slated to integrate a variable-geometry spike inlet and precooler technology required for higher supersonic regimes.
“Speed is the fundamental requirement for our flight systems and for our company. We’re building and flying aircraft on timelines that match the urgency of the world we’re in. Today’s flight kicks off a critical flight test campaign that will ultimately get us to supersonic speeds.”
AJ Piplica, CEO of Hermeus
Strategic Roadmap: The Path to Hypersonic
Hermeus is pursuing a distinct path in the high-speed aviation sector by focusing on air-breathing propulsion rather than rocket power. This approach is essential for developing reusable aircraft capable of operating from standard runways. The Quarterhorse program is structured to incrementally validate the technologies needed for the company’s future flagship vehicles: Darkhorse, a multi-mission hypersonic drone, and Halcyon, a commercial passenger aircraft.
Iterative Development Phases
The company’s roadmap relies on a “Mk” iteration strategy to manage technical risk:
- Mk 1 (Completed 2025): Validated the ability to design, build, and fly a jet from scratch in approximately one year.
- Mk 2 (Current): The Mk 2.1 validates the airframe and F100 engine integration. Future tests with the Mk 2.2 will introduce the complex inlet systems.
- Mk 3 (Future): Will integrate the full “Chimera” turbine-based combined cycle (TBCC) engine, aiming to break the SR-71’s airspeed record of Mach 3.3+.
AirPro News Analysis
The successful flight of the Mk 2.1 places Hermeus in a strong position within the competitive hypersonic landscape of early 2026. While competitors like Stratolaunch have achieved high-Mach test flights using air-launch methods, and Venus Aerospace is advancing rotating detonation rocket engines, Hermeus is carving a niche in autonomous, runway-independent air-breathing systems.
From a defense perspective, the Mk 2 platform offers immediate utility beyond serving as a mere testbed. Industry observers, including reporting by Defense News, suggest that high-speed drones like the Quarterhorse could fill critical gaps in Intelligence, Surveillance, and Reconnaissance (ISR) or serve as realistic high-speed targets for missile defense systems before the fully hypersonic Darkhorse becomes operational.
Frequently Asked Questions
Did the Quarterhorse Mk 2.1 go supersonic on this flight?
No. This initial flight was a subsonic test to validate handling and remote piloting systems. The aircraft is designed to reach speeds up to Mach 1.25 later in its test campaign.
What engine does the Mk 2.1 use?
It uses a Pratt & Whitney F100-229 turbofan, a proven engine found in tactical fighters. It does not yet use the full turbine-based combined cycle (TBCC) engine, which is reserved for later iterations.
What is the difference between Quarterhorse and Darkhorse?
Quarterhorse is a flying testbed designed to validate technology. Darkhorse is the planned multi-mission hypersonic drone intended for national defense applications, targeting speeds of Mach 5.
Sources
Photo Credit: Hermeus
Military Technology
Honeywell Aerospace and Shield AI Complete Autonomous ISR Mission
Honeywell Aerospace and Shield AI completed a two-aircraft autonomous ISR mission near Phoenix after just six weeks of Hivemind platform training.

Honeywell Aerospace and Shield AI have successfully completed two autonomous flight demonstrations, culminating in a coordinated intelligence, surveillance, and reconnaissance (ISR) mission on October 8, 2026, near Phoenix, Arizona.
The milestone, announced in a press release on October 13, 2026, highlights the rapid integration of advanced autonomy using open architecture technologies, with Honeywell engineers achieving their first autonomous flight after just six weeks of training on Shield AI’s Hivemind Enterprise platform.
Rapid autonomy integration and flight milestones
The autonomy development effort began in late April 2026 when Honeywell Aerospace’s team started training on the Hivemind Enterprise platform. By mid-June 2026, the team flew a BFD-SE8 multirotor aircraft autonomously for the first time. This development process was originally estimated to take 54 weeks before the integration of the Hivemind system.
The first official autonomous flight demonstration took place on July 8, 2026, in Plymouth, Minnesota. During this event, the aircraft autonomously executed a planned mission that included dynamic rerouting around a designated no-fly zone.
The program advanced to a multi-aircraft operation on October 8, 2026. Two aircraft running the Hivemind software completed a coordinated ISR mission near Phoenix, Arizona. The aircraft autonomously shared target information and divided mission responsibilities without human intervention.
Tom Schaefer, Vice President of Hivemind Enterprise at Shield AI, highlighted the efficiency of the integration process:
“Honeywell Aerospace engineers flew their first autonomous aircraft within weeks, work their engineering leads estimated would normally take a year. Hivemind Enterprise handled the autonomy basics, so the team could spend its time on its own detection and tracking model. We built Hivemind so partners can work this way.”
The Hivemind platform and open architecture
The Hivemind Enterprise platform packages Shield AI’s development environment with its onboard autonomy software. It provides core functions such as route planning, mission management, and aircraft-to-aircraft communication. The system is designed to enable swarms of drones and aircraft to operate autonomously without GPS, communications, or a human pilot.
The autonomous flights integrated Honeywell Aerospace’s o480 inertial navigation system and Anthem avionics portfolio with the Shield AI software stack.
Todd Giles, Senior Vice President of Engineering and Chief Technology Officer at Honeywell Aerospace, emphasized the broader implications for the industry:
“Open architectures are changing the pace of innovation in aerospace, and this milestone demonstrates how Honeywell Aerospace can rapidly translate advanced autonomy into real-world capability. By combining our expertise in avionics, navigation, sensing and autonomy, we are helping create a scalable foundation for the next generation of autonomous aircraft and mission systems.”
Honeywell Aerospace’s independent trajectory and Shield AI partnership
The collaboration between the two companies was formalized on July 22, 2026, with a Memorandum of Understanding signed at the Farnborough International Airshow. The agreement focuses on developing a trusted autonomy software stack on Shield AI’s Hivemind Software Development Kit.
The autonomous flight milestones follow a major corporate transition for Honeywell Aerospace. On June 29, 2026, the company completed its spin-off from parent company Honeywell International. It now operates as an independent, publicly traded company on the Nasdaq under the ticker symbol HONA. Headquartered in Phoenix, Arizona, the tier-1 aerospace and defense supplier employs over 36,000 people and serves more than 10,000 global customers.
Shield AI, a venture-backed defense technology company based in San Diego, California, has seen increasing adoption of its AI pilots. The Hivemind system has piloted more than 40 different platforms to date, including F-16 fighter jets, Helicopters, and ground vehicles. On October 7, 2026, Shield AI and Kraken Technology Group demonstrated autonomous maritime teaming by integrating Hivemind onto uncrewed surface vessels in Portsmouth, United Kingdom.
AirPro News analysis
The reduction of an autonomy development cycle from an estimated 54 weeks to just six weeks is a material shift in how aerospace primes integrate third-party artificial intelligence. As defense sectors globally push for the rapid deployment of autonomous systems in contested environments, the bottleneck has often been the bespoke integration of flight control and mission management software. By utilizing an open architecture platform that handles baseline autonomy, tier-1 suppliers like Honeywell Aerospace can focus engineering resources on proprietary sensor integration and specific mission capabilities. We view this successful multi-aircraft demonstration as a validation of the open-systems approach, likely accelerating the timeline for fielding collaborative combat aircraft and autonomous ISR swarms.
Photo Credit: Honeywell Aerospace
Military Technology
Whisper Aero eQ250 Completes First Crewed Flight Tests
Whisper Aero reaches TRL 7 with eQ250 electric ducted fans after crewed flights in Tennessee, recording 52 dB(A) at 100 feet.

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.
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
Photo Credit: Whisper Aero
Military Technology
Saab Unveils A3-001 Supersonic Stealth Drone Concept
Saab revealed the A3-001 uncrewed combat air system concept at Malmen Air Base, targeting mid-2030s operations alongside the Gripen E.

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.
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
Photo Credit: Saab AB
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