Reusable Hypersonic Test Vehicles

Hermeus is developing reusable hypersonic aircraft capable of Mach 5+ speeds using a turbine-based combined cycle (TBCC) engine that transitions from jet engine mode to ramjet mode as speed increases. The Quarterhorse autonomous vehicle serves as a testbed for the engine and thermal protection technologies. The company has over $60 million in Air Force contracts and aims to eventually build Halcyon, a Mach 5 passenger aircraft.

Reusable hypersonic vehicles address a fundamental limitation of hypersonic missile programs: each missile is single-use and costs millions of dollars. A reusable platform can fly repeatedly, providing persistent hypersonic capability for intelligence, surveillance, and reconnaissance (ISR), rapid logistics, and potentially strike missions at a fraction of the per-mission cost.

The dual-use potential is significant: the same technology that enables military ISR at Mach 5 could eventually enable point-to-point passenger travel in 90 minutes anywhere on Earth. Hermeus, based in Atlanta, represents the startup approach to hypersonic technology development — moving faster than traditional defense primes by accepting higher risk and iterating rapidly.