German Engineers Packed Hydrogen Into Hollow Tractor Wheels. Now the Machines Run All Day Without Heavy Batteries

[Caribbeans]

The cavity inside a tractor wheel just became the most valuable space on the machine.

German Engineers Packed Hydrogen Into Hollow Tractor Wheels. Now the Machines Run All Day Without Heavy Batteries

indiandefencereview.com | Evelyn Hart | May 8, 2026

A tractor wheel does one job: it holds up the machine and turns. German engineers have just given it a second job, hiding hydrogen fuel inside it.

The concept, reported by Fuel Cells Works, turns the empty cavity inside heavy-duty tractor wheels into high-pressure storage vessels. Moving fuel into space that otherwise does nothing frees up the rest of the tractor while packing in more hydrogen than current designs allow.

The developers at Hörmann Vehicle Engineering state the target plainly: a hydrogen-powered tractor that works a full day without refueling, matching the endurance of diesel. Volkmar Vogel, Senior Vice President, and Stefan Prager, Project Manager and Head of Commercial Vehicles at Hörmann, are developing the design under the RAHD funding project, backed by the Sächsische Aufbaubank and the European Union.



Why Hydrogen Tractors Run Out Too Soon

The problem is volume, not weight. Hydrogen carries far less energy per liter than diesel, even when squeezed to 700 bar. A tractor that plows for ten hours simply cannot hold enough fuel in the usual spots...more
https://indiandefencereview.com/hydrogen-tractor-wheel-tank-storage/

Related:
German green hydrogen transport mandates set to become law
https://www.gasworld.com/story/german-green-hydrogen-transport-mandates-set-to-become-law/2249091.article/

[Roy Rolling]

1. Great imagination

I hope it works, clever idea. I worry, though, of flying tractors floating like the Hindenburg with all that lighter than air hydrogen gas. 😉