A secret Mach 5 test could completely change air travel forever: are you ready to cross the Pacific in two hours?

On November 26, 2003, aviation reached the end of an era. That was the day the Concorde, the Franco-British supersonic jet built by British Aircraft Corporation and Aérospatiale, officially ended 27 years of commercial flights. Poor profitability and a fatal crash in 2000 were two of the factors that accelerated its downfall.

Since then, several projects have attempted to revive commercial supersonic travel – flights capable of reaching speeds impossible for conventional aircraft while dramatically cutting transatlantic travel times. Among the most notable are NASA’s X-59 and Boom Supersonic’s Overture.

How fast is Mach 5?

But now a new contender has emerged, developed far more quietly. Without promising launch dates or making bold public claims, Japan’s Aerospace Exploration Agency (JAXA) has carried out a hypersonic engine test that goes beyond anything currently seen in the aerospace industry. The test took place at JAXA’s Kakuda Space Center in Miyagi, where engineers conducted the country’s first Mach 5 combustion test using an experimental hypersonic aircraft.

That figure – Mach 5, or roughly 3,790 mph – far exceeds the targets set by Boom Supersonic, whose Overture aims for Mach 1.7, about 1,200 mph. At those speeds, a flight between Tokyo and New York, nearly 6,840 miles apart, could theoretically take just one hour and 45 minutes. While some companies are trying to revive the past, others are attempting to push aviation into entirely new territory.

What exactly did JAXA test?

The Japanese engineers recreated a simulated Mach 5 flight environment inside JAXA’s ramjet engine testing facilities using a compact experimental aircraft. During the test, the vehicle endured temperatures close to 1,800 degrees Fahrenheit across its fuselage – an extreme thermal load capable of destroying the structures used in today’s aircraft.

But the trial went beyond simply igniting the hydrogen-powered engine. Researchers also analyzed the aircraft’s overall performance under hypersonic conditions, evaluating thermal insulation, exhaust gas temperature distribution and the behavior of aerodynamic control surfaces under extreme heat.

According to the results released so far, the test was considered a success. The thermal protection system managed to keep the aircraft close to normal operating temperatures despite the harsh conditions. That remains one of the greatest engineering challenges in hypersonic flight, since modern aircraft rely heavily on highly sensitive onboard electronic systems for flight control and engine operation.

During the test, engineers also studied the environmental impact of the hydrogen ramjet’s exhaust gases. The goal was not only to reach the target speed, but also to gather data on the sustainability of hydrogen-based hypersonic propulsion.

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