The US Air Force Join The Race For Supersonic Passenger Flight

Hermeus, a Georgia-based start-up, has picked up a US$1.5 million contract from the United States Air Force (USAF) to work on a hypersonic aircraft. The USAF reckons there’s potentially room for this type of plane in its VIP fleet.

The US Air Force Join The Race For Supersonic Passenger Flight
Hermeus has been awarded $1.5 by the USAF to work on hypersonic aircraft. Photo: Hermeus News Room

The idea of future US Presidents scooting around the countryside in hypersonic planes might give some pause for thought. On the flip side, the sooner they arrive, the sooner they depart.

A Georgia-based start-up that’s moving fast

Hermeus describes itself as a venture-backed company. It has a long-term vision of transforming the global human transportation network with Mach 5 aircraft. It won this contract after it successfully tested a Mach 5 combined-cycle engine prototype in February 2020.

The start-up built and tested the engine in just nine months. That’s impressive, but a scroll through the Hermeus leadership team and board of advisors shows some serious aviation and aeronautical engineering muscle.

Hermeus picked up the contract through AFWERX, the USAF innovation incubator. AFWERX was set up in 2017 by the Secretary of the Air Force. Its website describes AFWERX the following:

“…a community of Air Force innovators who strive to connect Airmen to solutions across the force: whether that be funding, collaborating with industry, or simply receiving guidance on a project.

The firm will team up with the Air Force’s Presidential and Executive Airlift Directorate, which is based at Wright-Patterson Air Force Base in Ohio. Hermeus says the money is to fund a rapid assessment of modifications to Hermeus Mach 5 aircraft. The aircraft will support the Presidential and Executive Airlift fleet.

The Hermeus Mach 5 combined-cycle engine prototype. Photo: Hermeus News Room

“Early integration of unique Air Force requirements for high-speed mobility and evaluation of interfaces between high-speed aircraft and existing communications, airport, and air traffic control infrastructure lays the groundwork for a seamless transition to service,” Hermeus said in a statement.

“Additionally, Hermeus will prepare test plans to reduce the technical risk associated with these modifications to support Air Force requirements.”

Combined-cycle engine catches the eye of USAF

It’s the combined-cycle engine that appears to have caught the eye of the USAF. These types of engines work by combining standard jet turbines with the aero thermodynamic duct ramjet style engines. Hermeus says its successful test earlier this year served as risk reduction for its turbine-based combined cycle engine architecture. The test also illustrated its ability to deliver on time and within budget.

The idea is for the aircraft to take off and land like a regular plane but hit hypersonic speeds midflight. Other than the engine, no real modifications are needed for the plane.

“Using our pre-cooler technology, we’ve taken an off-the-shelf gas turbine engine and operated it at flight speed conditions faster than the famed SR-71.  In addition, we’ve pushed the ramjet mode to Mach 4-5 conditions, demonstrating full-range hypersonic air-breathing propulsion capability,” said a Hermeus spokesperson.

The USAF is looking for innovation and a return on its investment. Photo: Hermeus News Room

USAF chasing innovation and return on investment

“Leaps in capability are vital as we work to complicate the calculus of our adversaries.” That’s according to Brigadier General Ryan Britton, the Program Executive Officer for Presidential and Executive Airlift at the USAF.

“By leveraging commercial investment to drive new technologies into the Air Force, we are able to maximize our payback on Department of Defense investments.”

While there is a lot of work going on in the hypersonic and supersonic field, Boom Supersonic and Virgin Galactic are two contenders that spring to mind; most are incredibly capital intensive. Hermeus demonstrates that innovation need not always be cost-prohibitive, that from the smallest amounts of funding, big things can grow.

What are your thoughts about this project? Let us know what you think in the comment section.