Hermeus licensed to manufacture Pratt & Whitney F100 fighter engine

Pratt & Whitney, a business unit of RTX (NYSE: RTX), and Hermeus have signed a Production License Agreement authorizing Hermeus to manufacture the F100-PW-229 engine, a propulsion system used in U.S. Air Force F-15 and F-16 fighter jets.

Under the agreement, Hermeus will produce the engines using its rapid-build production model while adhering to Pratt & Whitney's standards for quality, safety, and site activation. The deal creates a new qualified domestic production source for the F100 engine.

The F100 engine currently powers Hermeus' Quarterhorse aircraft, which completed a supersonic flight earlier this year. Hermeus describes the Quarterhorse as the first privately developed unmanned supersonic jet. The F100 engine has accumulated more than 32 million flight hours across more than five decades of service.

Jessica Villardi, vice president of Fighter & Mobility Programs at Pratt & Whitney, said the partnership is aimed at expanding U.S. production capacity to meet growing customer demand.

Zach Shore, CEO of Hermeus, said the agreement makes Hermeus "the first vertically integrated airframer with the in-house propulsion capability required to scale Quarterhorse."

The announcement was made according to a press release dated Sept. 15, 2026.

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