Hermeus
Building High-Mach Aircraft and a New U.S. F100 Production Source
The product
Hermeus designs, builds, and flies uncrewed high-speed aircraft and propulsion systems. Its roadmap progresses through Quarterhorse test aircraft toward an operational Mission Plane and the reusable hypersonic Darkhorse; Ramjet-X adds an expendable high-Mach test vehicle launched from Quarterhorse. Under a September 2026 production license from Pratt & Whitney, Hermeus is also preparing to manufacture F100-PW-229 fighter engines.
The thesis
The U.S. military needs more frequent and affordable access to realistic supersonic and hypersonic flight environments, while the defense industrial base also needs additional capacity for proven fighter propulsion. Hermeus now pairs rapid aircraft iteration with a licensed pathway to become a new qualified domestic source for an engine used by F-15 and F-16 fleets.
How it runs
Hermeus vertically integrates airframe design, propulsion integration, manufacturing, flight testing, and deployed operations across a rapid sequence of purpose-built aircraft. It uses reusable Quarterhorse aircraft as both technology demonstrators and flight-test infrastructure, is developing Ramjet-X as an expendable test article, and will manufacture F100-PW-229 engines under Pratt & Whitney quality, safety, and site-activation standards.
How it earns
Near-term revenue comes from defense development and flight-test contracts, led by a DIU program whose ceiling increased to $219 million for high-Mach flight and payload-release demonstrations. Ramjet-X is intended to add Flight Test as a Service revenue. The F100 license creates a prospective fighter-engine manufacturing revenue line, but neither production orders nor contract value were disclosed with the licensing announcement; the $219 million DIU figure is a contract ceiling, not recognized revenue.
Why it wins
Hermeus combines fast hardware iteration, in-house flight operations, proprietary precooling and TBCC integration, and reusable-carrier test economics. The Pratt & Whitney license adds the right to manufacture the combat-proven F100-PW-229 and positions Hermeus as a vertically integrated airframer with in-house production capability for Quarterhorse's core engine, subject to qualification and site activation.
Evidence ledger
- website · 2026-04-27
Hermeus identifies as a reindustrialization company.
https://www.hermeus.com - first-party · 2026-09-22
Hermeus describes the DIU award as a contract ceiling of $219 million for 2026-2027 high-Mach flight and payload-release demonstrations; a ceiling is not treated as recognized revenue.
https://www.hermeus.com/article/hermeus-scales-diu-contract-to-219m-to-demonstrate-high-mach-flight-for-department-of-war - company_flight_update · 2026-09-12
Quarterhorse Mk 2.1 reached Mach 1.21 in May 2026; Hermeus said Mk 2.2 was already in build and test, with Mk 2.3 to follow.
https://hermeus.com/article/hermeus-achieves-its-first-unmanned-supersonic-flight - first-party · 2026-09-22
Hermeus is developing Ramjet-X as an expendable vehicle launched from reusable Quarterhorse and plans to offer high-Mach Flight Test as a Service, with integrated testing planned for 2027.
https://hermeus.com/article/hermeus-unveils-ramjet-x - company_product_page · 2026-09-12
Hermeus publishes an iterative aircraft roadmap through Mission Plane and Darkhorse and says it owns airframe, propulsion, subsystem, manufacturing, and flight-operations capabilities.
https://hermeus.com/aircraft - company_leadership_announcement · 2026-09-12
Zach Shore became CEO effective June 1, 2026, while founder AJ Piplica transitioned to executive chairman; Hermeus also cited a $350 million Series C and more than $500 million in total private capital.
https://www.hermeus.com/article/hermeus-announces-executive-leadership-transition-zach-shore-named-ceo-aj-piplica-remains-executive-chairman - company_financing_announcement · 2026-09-12
Hermeus said its $350 million Series C would scale the Quarterhorse fleet, expand prototyping in Southern California, and prepare Atlanta for production and scale.
https://hermeus.com/article/350m-to-build-the-fastest-aircraft-in-the-world-for-the-american-warfighter - first-party · 2026-09-22
Pratt & Whitney authorized Hermeus to manufacture F100-PW-229 engines as a new qualified production source; Hermeus must meet Pratt & Whitney quality, safety, and site-activation standards. The release disclosed no order quantity, contract value, or revenue.
https://www.rtx.com/news/news-center/2026/09/15/hermeus-to-manufacture-pratt-whitneys-f100-pw-229-engine-under-new-production - first-party · 2026-09-22
Hermeus said the license expands domestic engine capacity and brings in-house propulsion manufacturing capability needed to scale Quarterhorse.
https://www.hermeus.com/article/pw-f100-licensing
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