Archer Aviation’s (NYSE: ACHR) stock closed on July 20 at $5.31, up 19.59% for the day. The rally was driven by Archer and Anduril’s jointly released hybrid-electric, dual-purpose vertical takeoff and landing (VTOL) aircraft platform. Anduril also showcased a defense variant of “Thunder,” positioned as a Category 5 autonomous attack quadrotor.
Joint Release from Archer and Anduril
Based on market data, Archer Aviation (NYSE: ACHR) shares saw an intraday gain as high as 19.8% on July 20, 2026 (Monday) in early trading, and were still up 18.9% as of 12:50 p.m. ET. The joint statement released by Archer and Anduril in Farnborough, UK, marked the first public unveiling of the companies’ jointly developed results, directly driving this round of gains.
Archer founder and CEO Adam Goldstein said in the joint statement: “This mission requires designing from scratch and building from the ground up to meet the needs of modern commercial and defense applications. We partnered with Anduril and took a bold, first-principles approach to develop what we believe is the most advanced vertical takeoff and landing aircraft to date.”
“Thunder” Technical Specifications: Category 5 Autonomous Attack Quadrotor and Dual-Purpose Platform Architecture
Based on the joint statement released by Anduril and Archer on July 20, the main technical specifications for the Thunder platform are as follows:
Positioning: Category 5 autonomous attack quadrotor, one of the largest and most capable aircraft in the U.S. Department of Defense’s unmanned aircraft systems (UAS) in the medium-sized class
Series hybrid-electric propulsion system: Enables significant range and endurance, and optimizes power output across various flight conditions
Dual tiltrotors: Maintains efficiency in different flight states by changing rotor speed, reducing the power required for cruise and fuel consumption, while minimizing acoustic signatures
No runway operations required: Combines VTOL with efficient wing-borne cruise to enable operations in harsh environments
Modular heavy payloads: Supports multiple commercial and defense mission configurations
Thunder has completed multiple test flights using full-scale replacement aircraft, and its official first flight is planned for 2027.
Commercial Applications and Follow-Up Timeline: First Commercial Customers Announced This Week; First Flight Planned for 2027
According to Archer’s official statement on July 20, the company plans to announce later this week the first commercial partners for the dual-purpose VTOL platform.
Shane Arnott, senior vice president at Anduril, said in the statement: “Applying the best technical innovations from the commercial electric VTOL (eVTOL) market to the defense domain is the core of the combat value ‘Thunder’ creates for customers.
The new dual-purpose platform we are building together with Archer truly represents a leap in maneuverability.” Thunder’s first-flight schedule is set as an official target for 2027; the specific names of commercial customers and contract details will be subject to Archer’s subsequent official announcements.
FAQ
How much did Archer Aviation (ACHR) stock rise on Monday?
Based on market data, ACHR shares rose as high as 19.8% in early trading on Monday, July 20, 2026; as of 12:50 p.m. ET, the stock was still up 18.9%.
What are the core technical features of the VTOL platform jointly released by Archer and Anduril?
According to the joint statement from Archer and Anduril on July 20, the platform features a series hybrid-electric propulsion system and dual tiltrotors, enabling operations in harsh locations without needing runway facilities, combining VTOL with wing-borne cruise; the defense version of “Thunder” is a Category 5 autonomous attack quadrotor.
When is the planned first flight of “Thunder”?
Per the joint statement from Archer and Anduril, Thunder’s first flight is planned for 2027. It has already completed multiple test flights using full-scale replacement aircraft; the specific progress will follow official announcements.
