LiquidPiston has developed the X-Engine, a revolutionary rotary engine that challenges the conventional limitations of internal combustion engines. This compact prototype, utilizing the High Efficiency Hybrid Cycle, offers game-changing features such as smaller size, lighter weight, and fuel cell-level efficiency. Unlike the older Wankel rotary engine, the X-Engine addresses issues like incomplete combustion, sealing complications, and inefficient lubrication systems through smart design innovations. The X-Engine's versatility is a standout feature, being able to run on various fuels including diesel, jet fuel, propane, hydrogen, and even high-proof vodka. This adaptability has attracted interest from industries seeking cleaner and more sustainable energy solutions, notably the aerospace and defense sectors. LiquidPiston's X-Engine also introduces the concept of stationary combustion chambers and apex seals, optimizing fuel injection precision, combustion cleanliness, and overall efficiency. This innovation has resulted in a significant reduction in emissions and oil consumption. The X-Engine's flexibility extends to supporting compression or spark ignition based on the fuel and application requirements. The XTS-210, a specific iteration of the X-Engine, is designed for jet and diesel fuels, offering high power output in a compact, lightweight package perfect for hybrid electric systems and portable power generators. In a world where sustainability and adaptability are crucial, LiquidPiston's X-Engine presents a promising alternative to traditional combustion engines, potentially reshaping the future of clean energy.