A 155mm artillery shell left the barrel of a standard NATO howitzer, climbed into open air, and then did something no artillery round has done before: its liquid-fueled ramjet engine lit up, accelerating the projectile to Mach 3.5 and carrying it to a reported range of 150 kilometers. That is roughly four times the reach of conventional shells fired from the same gun, with no modifications to the weapon itself.
Tiberius Aerospace, a defense company with operations in the United States and United Kingdom, announced the successful test in spring 2026, calling it a world first for liquid-fueled ramjet ignition from a fielded 155mm howitzer. The claim, first reported by EDR Magazine, has since been covered by multiple defense outlets, though no independent government or NATO body has publicly confirmed the results.
How the round works
The firing sequence starts conventionally. A standard propellant charge launches the projectile from the howitzer tube the same way any 155mm shell leaves the gun. Once airborne and moving fast enough for sufficient air intake, the ramjet engine ignites.
Unlike a rocket, a ramjet breathes external air to burn its fuel, so it carries no heavy onboard oxidizer. That weight savings translates directly into longer range. The liquid fuel, as opposed to the solid fuel used in most rocket-assisted artillery rounds, theoretically allows throttle control during flight, opening the door to speed and trajectory adjustments that could improve both efficiency and accuracy over long distances.
If the stated performance holds up, the implications are significant. Standard 155mm high-explosive rounds typically reach 22 to 30 kilometers. Even extended-range munitions like the GPS-guided Excalibur or base-bleed shells top out around 40 to 60 kilometers. A round that reliably reaches 150 kilometers at Mach 3.5, roughly 2,685 miles per hour, would put howitzers in a range class currently occupied by tactical missiles and cruise munitions, as Interesting Engineering noted in its coverage.
Why platform compatibility matters
Tiberius Aerospace has emphasized that the round requires zero modifications to existing howitzers. If true, that is arguably as important as the range figure itself.
NATO armies collectively field thousands of 155mm guns: the American M777 and M109 Paladin, Germany’s PzH 2000, France’s CAESAR, and many others. A drop-in munition that multiplies their effective range would sidestep the years-long procurement cycles and billions in spending that new weapon systems demand. Security Journal UK reported that the test round was fired from a NATO-standard platform with no structural changes, reinforcing the company’s plug-and-play pitch.
That pitch resonates at a moment when NATO members are under pressure to expand their deep-strike capabilities quickly. The U.S. Army’s Extended Range Cannon Artillery (ERCA) program, which aimed to push 155mm range beyond 70 kilometers using a purpose-built gun and specialized ammunition, was effectively shelved in 2023 after running into cost overruns and technical problems. A munition-only solution that works with guns already in service would avoid many of the obstacles that sank ERCA.
What has not been proven yet
The gap between a successful demonstration and a combat-ready munition is wide, and Tiberius Aerospace’s test sits firmly on the demonstration side of that divide.
The company has not released detailed test data: no altitude profiles, no accuracy metrics, no information about terminal guidance, and no disclosure of how many rounds were fired. The 150-kilometer range and Mach 3.5 speed figures appear in every article covering the test, but whether those numbers were measured during this specific firing or represent projected performance for a future production round remains unclear.
Survivability under gun-launch conditions is a serious engineering challenge. A 155mm shell experiences acceleration forces commonly estimated at 15,000 Gs or more when fired. A liquid-fuel system must keep its fuel sealed, its combustion components intact, and its ignition mechanism functional after that violent launch, and then do so reliably across thousands of rounds in field conditions involving temperature extremes, humidity, vibration, and rough handling during transport and storage. None of the available reporting addresses how the fuel system performs under those stresses.
Guidance is another open question. At 150 kilometers, even tiny errors at launch compound into large miss distances at the target. The company’s public statements do not specify whether the test round carried GPS, inertial navigation, a terminal seeker, or any guidance at all. For a round intended to deliver precision fire at extreme range, guidance is not optional; it is the difference between a useful weapon and an expensive area-denial tool.
Cost per round is unknown. Tiberius Aerospace claims the technology will be cheaper than cruise missiles or loitering munitions, but has published no unit cost estimate. Liquid-fueled ramjet shells involve specialized materials, precision manufacturing, and fuel-management systems that are unlikely to be inexpensive. Whether the round can compete on price with existing extended-range options like Excalibur or simpler rocket-assisted projectiles will shape its adoption prospects.
The competitive landscape
Tiberius Aerospace is not working in a vacuum. Norway’s Nammo has been developing a solid-fuel ramjet 155mm round and has conducted its own test firings, pursuing a design philosophy that trades the throttle flexibility of liquid fuel for the mechanical simplicity and ruggedness of a solid propellant. Solid-fuel ramjets avoid the fuel-sealing and storage challenges that liquid systems face, though they sacrifice some ability to adjust speed and trajectory in flight.
Other extended-range artillery efforts include Boeing and Nammo’s Ramjet 155 program, various glide-shell concepts under development in Europe, and South Korea’s work on extended-range munitions for its K9 howitzer fleet. The broader trend is clear: multiple NATO-aligned nations and companies are racing to push 155mm artillery well beyond its traditional range envelope, driven by lessons from the war in Ukraine, where artillery range and ammunition supply have been decisive factors.
Where Tiberius Aerospace’s liquid-fuel approach fits in this crowded field, and whether it offers a decisive advantage over solid-fuel alternatives, will depend on test data that has not yet been made public.
Benchmarks that will separate demonstration from fielded capability
The reported test is credible as a technical milestone. Multiple defense outlets have relayed the same core description, and the underlying physics of a liquid-fueled ramjet fired from a gun tube, while extremely challenging to engineer, are well understood. But the marquee numbers should be treated as provisional until backed by independent measurement.
The indicators that will separate a promising demo from a real capability shift are straightforward: public acknowledgment of successful trials by a government test organization or NATO body; repeatable performance at full range across multiple firings; demonstrated guidance accuracy at extended distances; and a cost profile that defense ministries can actually afford at scale. Until those benchmarks are met, Tiberius Aerospace’s ramjet round is best understood as an ambitious proof of concept in a field where ambition is common and proven results are rare.
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*This article was researched with the help of AI, with human editors creating the final content.
