Engines
Hermeus Begins Engine Testing for Quarterhorse Mk 2
Quarterhorse Mk 2 will fly at Mach 2.5 ahead of the Mach 4 Mk 3 Prototype
Hermeus preecooler testing with Pratt & Whitney F100 engine
Hermeus called the launch of precooler testing on the Pratt & Whitney F100 the first major propulsion milestone for what will be its second Quarterhorse flying prototype, Mk 2.

Hermeus continues its march toward hypersonic development with the testing of its precooler technology on the Pratt & Whitney F100. The precooler lowers the temperature of incoming air, enabling an increase in the maximum speed of the turbine engine. Hermeus called the launch of such testing the first major propulsion milestone for what will be its second Quarterhorse flying prototype, Mk 2.

The company rolled out Quarterhorse Mk 1 in March with plans to begin flight trials later this year to test high-speed takeoff and landing at Edwards Air Force Base. That aircraft, an uncrewed, remotely piloted demonstrator, uses the GE J85 for its engine base.

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