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Hermeus has started taxi tests for its Quarterhorse Mk. 2.1 supersonic flight demonstrator at Spaceport America, New Mexico. The aircraft, remotely piloted and powered by a Pratt & Whitney F100-229 engine, is designed for high supersonic speeds and will be used by Kratos Defense for the U.S.

Navy's MACH-TB program. The testing phase includes validating ground handling, braking, and systems integration. Future flight tests will provide insights for the Mk. 3 version, which will utilize a complete TBCC propulsion system. Extensive flight tests are expected, surpassing those of the previous Mk. 1 demonstrator.