Andy Green sets new 406.3mph speed record for hydrogen-powered vehicles

British racing driver Andy Green added another entry to his decades-long land speed record career on Tuesday, reaching 406.320 mph in a car powered by two hydrogen internal combustion engines with a combined 1,600 horsepower — a new speed record for that specific vehicle category.

Green is best known in land speed record circles for a feat few drivers will ever match: in 1997, driving the jet-powered Thrust SSC, he became the first person to break the sound barrier on land, setting the outright world land speed record at 763 mph, a mark that still stands today. Tuesday's run doesn't come close to that figure, but it wasn't meant to — it targeted a distinct category specific to vehicles powered by hydrogen.

The car Green drove used two hydrogen internal combustion engines rather than a hydrogen fuel cell setup. That distinction matters: fuel cell vehicles convert hydrogen into electricity to power an electric motor, while hydrogen internal combustion engines burn the gas directly in a modified version of a conventional combustion engine, producing mechanical power in a way that more closely resembles a traditional petrol or diesel engine — including, notably, a comparable exhaust note, since the combustion process still involves controlled explosions inside cylinders, just with hydrogen as the fuel instead of fossil fuel.

That makes hydrogen combustion an unusual middle path in the push to decarbonize high-performance vehicles. Unlike battery-electric setups, which eliminate combustion entirely, hydrogen internal combustion engines retain much of the mechanical character and engineering approach of a traditional engine, while producing largely water vapor rather than carbon emissions — an appeal for motorsport engineers and manufacturers looking to cut emissions without abandoning combustion-based technology altogether.

Land speed record attempts of this kind take place on purpose-built or naturally flat courses long enough and smooth enough to allow a vehicle to safely reach and sustain extreme velocity, typically requiring miles of unobstructed straight-line distance for both acceleration and the controlled deceleration needed to bring a car down from several hundred miles per hour without incident.

Engineering a vehicle to run at these speeds on hydrogen combustion power presents its own set of challenges distinct from a standard high-speed record attempt. Hydrogen has a very different energy density and combustion behavior compared with conventional fuel, requiring specialized storage systems to keep the gas safely contained under pressure, along with an engine design tuned to handle hydrogen's faster flame speed and different ignition characteristics at sustained high engine loads.

Green's run adds to a broader pattern across motorsport of record attempts diversifying beyond traditional fossil-fuel vehicles. Electric land speed record cars, hydrogen fuel cell vehicles and now hydrogen combustion setups have all seen dedicated record attempts in recent years, mirroring a wider shift in the mainstream automotive industry toward alternative propulsion technologies, even as outright land speed records, still dominated by jet and rocket-powered vehicles, remain a separate pursuit.

Because land speed records are tracked by category, a run like Green's on Tuesday doesn't compete directly against jet-powered vehicles or other propulsion types — it's measured against previous records set specifically within the hydrogen-powered vehicle class, a structure that lets engineers push the boundaries of a particular technology without needing to match the raw output of fundamentally different propulsion systems.

For teams working on hydrogen-powered speed record vehicles, runs like this one often serve a dual purpose: setting a new benchmark within the category while also demonstrating, in a very public and measurable way, that hydrogen combustion technology can be pushed to extreme performance levels — a proof point that can carry weight both within motorsport and in broader conversations about hydrogen's viability as a high-performance alternative fuel.

For Green, the run adds another chapter to a career already defined by land speed record pursuits stretching back nearly three decades. Whatever comes next for hydrogen-powered speed attempts, Tuesday's 406.320 mph run stands as a marker of how far the technology has been pushed at the extreme end of motorsport engineering.