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.

In this article