In October 2025, Israeli startup Aquarius Engines achieved major milestones in the deployment of its ultra-lightweight, 10-kilogram (22 lb) hydrogen engine. This radical single-piston linear engine operates without fuel cells or a crankshaft, utilizing a simplified 20-piece assembly to deliver an efficient, low-cost alternative to fossil fuels. The Aquarius engine features a unique two-sided free-piston design where a single central rod moves back and forth on a two-stroke cycle. This linear mot
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Israeli startup Aquarius Engines has developed an ultra-lightweight 10-kilogram hydrogen engine that runs directly on hydrogen, without fuel cells or complex systems. This breakthrough offers a low-cost, scalable alternative to fossil fuels for power generation and mobility. • The engine operates using hydrogen combustion, producing only water vapor as exhaust. • Weighing just 10 kg, it is far lighter than conventional engines or fuel-cell systems. • The design uses very few moving parts, reduci
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