# Hermeus aerospace technology and manufacturing developments > Live situation record from CLSTR: https://clstr.news/situations/hermeus-aerospace-technology-and-manufacturing-developments > Updated: 2026-09-15T12:46:33.000Z. Sources: 7. Developments: 2. Aerospace startup Hermeus has introduced several developments regarding its high-speed flight technologies and manufacturing capabilities. The company unveiled Ramjet-X, an expendable ramjet-powered vehicle intended to reduce costs for high-Mach airbreathing flight testing. Designed to be air-launched from the Quarterhorse uncrewed aircraft at Mach 3, Ramjet-X is expected to reach altitudes of 100,000 feet and cruise near Mach 4. Hermeus intends to market this as ‘high-Mach Flight Test as a Service’ for customers testing sensors, autonomy, and propulsion. In a separate expansion of its operations, Hermeus signed a production license agreement with Pratt & Whitney to manufacture the F100-PW-229 fighter jet engine. This engine, used in F-15 and F-16 aircraft, will power the Quarterhorse family of unmanned aircraft. This move aims to bolster the United States defense industrial base by providing an additional production source. Hermeus is also developing a proprietary ‘Chimera’ engine that combines a precooled F100 engine with a ramjet. ## Timeline ### 2026-09-15: Hermeus to manufacture Pratt & Whitney F100 fighter engines Hermeus has secured a licensing agreement with Pratt & Whitney to manufacture F100-PW-229 fighter engines to support its hypersonic Quarterhorse unmanned aircraft program. 2 sources. https://clstr.news/cluster/hermeus-to-manufacture-pratt-whitney-f100-fighter-engines ### 2026-09-09: Hermeus unveils Ramjet-X for low-cost high-Mach flight testing Hermeus unveiled Ramjet-X, an expendable vehicle designed to be air-launched from a Quarterhorse aircraft to provide low-cost, high-Mach flight testing services. 5 sources. https://clstr.news/cluster/hermeus-unveils-ramjet-x-for-low-cost-high-mach-flight-testing --- Cite as: Hermeus aerospace technology and manufacturing developments. CLSTR, https://clstr.news/situations/hermeus-aerospace-technology-and-manufacturing-developments