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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