How It Works: The 1-Stroke | Free Piston Engines | That Defy Physics (2026)

In this video, we will analyze absolutely every unique internal combustion engine development introduced in recent years, from the spherical Hüttlin and coaxial designs to more advanced one-stroke engines like InnEngine's e-Rex, which has already secured agreements with Horse Powertrain and Airbus, and I will tell you what the further development of each of these designs has been, revealing that while some promising prototypes like the Coaxial Engine have faded, others such as the Aquarius engine, Liquid Piston rotor, and Cosworth's gas turbine have been quietly absorbed into classified military contracts, leaving only the InnEngine on the verge of serial production—so watch as we uncover which of these internal combustion engines are already in serial production and which are secretly shaping the future!

00:00 Today on the show
00:27 Problems of modern ICE
01:27 Spherical Engine
02:42 Co-axial Engine
03:38 1-Stroke Engine
06:30 Gas turbine engine for automobiles
07:22 3 free-piston ICE
09:14 Space rotary internal combustion engine
11:31 The rotary engine that went into small-scale production
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