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A World First in Hydrogen Storage
Hydrogen is the cleanest fuel there is. The hard part has always been storing it. Stellar has solved that.
Stellar holds hydrogen inside solid metal, the way a sponge holds water. No high pressure tanks, nothing frozen, nothing to boil away. It is the fuel system inside Stellar Jet, which refuels in 10 minutes.
Hydrogen Aviation
Both Stellar Jet aircraft carry their hydrogen in solid metal hydride, never as a liquid and never frozen.
Safe, compact fuel is what makes a hydrogen aircraft practical. Stellar Jet takes off and lands vertically, cruises like a jet and refuels in 10 minutes, with zero emissions in operation.
Refuelling Made Simple
Proven
The real cartridge, with a cutaway of the alloy inside
A World First
Hydrogen is the cleanest fuel there is. The hard part has always been storing it. Stellar has solved that.
Today most hydrogen is either squeezed into heavy tanks at up to 700 times atmospheric pressure, or chilled into a liquid colder than minus 250°C. Both are expensive, complex and hard to handle.
Stellar stores hydrogen a different way: inside a solid metal, the way a sponge holds water. It fills at low pressure, gives the hydrogen back with gentle warmth, and there is nothing to freeze and nothing to boil away.
It is the technology behind Stellar Jet. Flight testing is scheduled for late 2026, with the exact window confirmed once ground testing completes.
Hydrogen Aviation
Both Stellar Jet aircraft carry their hydrogen in solid metal hydride, never as a liquid and never frozen. Safe, compact fuel is what makes a hydrogen aircraft practical, and Stellar Jet refuels in 10 minutes.
Boss n Queen is the global sales distributor for Stellar Jet, the hydrogen powered aircraft that takes off and lands vertically and cruises like a jet, with zero emissions in operation.
Refuelling
A conventional hydrogen station needs ultra high pressure compressors and storage banks. Stellar's tank fills at low pressure, so the equipment is far simpler and far cheaper to build.
Pair it with on site green hydrogen and the fuel is made, stored and used in the same place.
See the complete green hydrogen cycleApplications
Anywhere clean power is needed and refuelling should be simple. Cartridges combine into packs sized to the job, from a single unit to a complete fuel system.
The Prototype
The Technical Detail
The current standard
Cryogenic
Stellar
How It Works
Hydrogen is fed into the cartridge at low pressure, around 15 to 50 bar, and absorbed straight into the metal alloy. A cooling loop carries away the heat that absorption creates.
Once absorbed, the hydrogen sits inside the crystal structure of the alloy. There is no large volume of free gas under high pressure and nothing to keep frozen.
Gentle heat, roughly 20 to 80°C, releases the hydrogen on demand. In a fuel cell system the waste heat already produced does that job.
The released hydrogen feeds a fuel cell, which turns it into electricity. The only by-product is water.
Cartridges combine into packs sized to the job, from a single unit to a complete fuel system.
Where the Testing Stands
Validated at the Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences. Samples absorbed hydrogen at just 15 bar and 20 to 50°C, with stable performance over repeated cycles.
Five cartridges each ran a 100 W fuel cell for 53 minutes, with no external heating, no leakage and no pressure instability.
A major European automaker tested a cartridge on its own bench: 8 percent hydrogen by weight at only 30 bar, in under 30 minutes, below 60°C.
A redesigned cylinder with dedicated connections and internal cooling, then a larger unit holding around 200 grams of hydrogen and a full demonstrator.