Diesel-Fueled Engines

When one considers that a multi-MW natural gas or diesel-fueled reciprocating engine is >4 times larger than an equivalent output Linear Engine (and a natural gas turbine engine is >2-times larger) and twice as expensive – it becomes evident that the much-smaller Linear Engine-based U.S. Megawatts Generator will enjoy substantial cost and weight savings compared to these hulking machines:

         GAS TURBINES                 RECIPROCATING ENGINES                LINEAR ENGINES




Gas  Turbines   are   expensive because they require complex turbine blades  and associated sophisticated sub-systems.


A Linear Engine can be built at low cost because it uses off-the-shelf,  standardized and commoditized hydraulic system components (high pressure cylinders, pistons and computer-controlled valves) that are widely available and easy to modify for the Linear Engine’s purposes.


These piston and pipe components scale up very well to much larger and heavier sizes (think maritime and oil industry applications), with the largest MW output sized components getting built at the lowest per-kW cost.

Natural Gas + Compressed Air = New Hybrid Electric Generator Technology 

The Linear Engine has the potential to become one of the most fuel efficient yet powerful high-torque engine generators commercialized because it combines the following patents-pending innovations:



  • a long piston stroke measured in feet, rather than inches (as in recip engines), which offers much larger compressed air volumes and positive displacement and residence time inside the cylinders to completely combust natural gas with the lowest resulting emissions and fuel consumption (while cost-effectively producing >500-5,000 foot-lbs of torque to power kW kilowatt-sized electric generators (for homes and small businesses) and MW megawatt-sized generators (for power plant operators and large businesses).
  • a  novel  Free-Piston  Exhaust  Actuation  method  that solves the dual-piston control, piston-positioning accuracy and piston-landing problems that plagued previous free-piston engine attempts of the past (which the U.S. Megawatts Linear Engine overcomes with precision control and variable compression),gear
  • a novel external air compressor stage that allows significantly  larger volumes of intake air (at on-demand compression ratios) to be compressed and expanded in two-strokes, rather than the four strokes required by gasoline and diesel recip engines (whose short-stroke pistons severely limit the volume of air they can intake before their compression stroke).
  • a novel Sprague-Gear Transmission with perfect 90-degree vector angle power take-off that avoids the more than 50% mechanical efficiency losses suffered by conventional short-stroke reciprocating piston engines (whose heavy camshafts, crankshaft, flywheel and bearings, are eliminated in the Linear Engine).

Having a larger supply of compressed air,  a much lighter, but longer piston stroke and a more efficient means of power takeoff creates a much more powerful and cleaner-burning natural gas engine than any other internal combustion natural gas powered engine on the market today.

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