LiquidPiston's X-Engine is up to 10x smaller and lighter and 30% more efficient than traditional combustion engines.

Invest in the New Engine That's Reinventing Propulsion

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Although internal combustion engines (ICEs) have driven our cars, motorcycles and planes for 150 years, their basic principles haven't changed much since the days of Henry Ford. The future, it seems, belongs to battery-powered electric vehicles. But LiquidPiston thinks we've been looking at the problem all wrong—and to prove it, it has reinvented the engine from the ground up.

LiquidPiston's engine, dubbed the X-Engine, looks tiny next to its traditional counterparts, yet it packs up to 10 times more punch per pound. A 40 to 60 horsepower version, powerful enough to drive a tractor, is also small and light enough to be carried in a backpack. What's more, it even weighs significantly less than electric vehicle (EV) batteries and may consume less fuel than an EV recharge. That's because EV charging stations are often powered by large central power plants that carry electricity over long transmission lines—many of which still use fossil fuels, including coal.

So much for green energy. In fact, the U.S. Energy Information Administration projects that fossil fuels will still supply over 70 percent of energy consumption by 2050.

In short, combustion engines may have a long future ahead of them after all, and that's where LiquidPiston comes in. Here we'll take a closer look at LiquidPiston's technology to see why it has attracted $11 million in funding from the U.S. military and other investors.

An Emissions Emergency

Most of today's ICEs continue to rely on models developed back in the 1800s. Whether they're powered by gasoline or diesel fuel, and whether they drive a lawn tractor or a jet plane, these engines all work in the same basic way: An internal piston compresses air and fuel into a chamber, igniting that mixture and directing the exhaust out through a valve. This process powers things like the rotation of a shaft to turn a car wheel or even the propeller of a plane.

Although engineers have introduced plenty of incremental improvements to these engines over the past century, they haven't innovated in the area of the thermodynamic cycle. This determines how efficiently the engines convert the energy into useful work output. And because it has gone unchanged, only incremental efficiency improvements have been achieved until now.

We've looked to battery-powered vehicles to provide an escape from these historic engine limitations. But the debate lives on regarding how much and under what conditions EV manufacturing, electricity generation, operation and disposal actually reduce the life cycle emissions compared to gas-powered cars. Still, there are many scenarios for which plug-in hybrids and pure hybrids are more practical and perhaps more economical. But in many cases, a smaller and more efficient engine could be a huge upgrade for hybrid owners.

Enter LiquidPiston, whose engine may well address many of these problems in a single stroke.

A Rotary Revolution

LiquidPiston's X-Engine uses innovative engineering and exploits the natural laws of physics to create a new rotary engine platform that delivers performance advantages over traditional piston internal combustion engines (ICEs). As a mechanical device, the X-Engine is a marvel of elegant design and efficient function: The moving rotor draws air—or an air-fuel mixture, depending on the version of X-Engine—into compartments within the housing. The rotor's rotation forces and compresses the air into one of three sculpted recesses along the housing's inner surface. The compression heats the air, turning the recess into a mini–combustion chamber, where a spark ignites the air-fuel mixture if the engine is operating in spark ignition mode or fuel is injected if the engine is operating in compression ignition mode. This process continues for the other two chambers in sequence.

This High Efficiency Hybrid Cycle (HEHC) is the feat of engineering genius behind the X-Engine's fuel efficiency as an optimized thermodynamic cycle designed to increase the amount of energy contained into useful work output. It enables the X-Engine to produce three combustion events for every rotor revolution, while using 10 times fewer components than a comparable piston engine—making it up to 80 percent smaller and lighter.

By producing more power with less weight and vibration, the X-Engine delivers up to 30 percent greater efficiency than any gasoline or diesel engine in use today—even when running on the exact same fuel. And by cutting down on fuel consumption, the engine's efficient combustion cycle also produces a much smaller carbon footprint than existing ICEs.

The Next Wave of Expansion

In 2021, LiquidPiston demoed its lightweight engine in an unmanned aerial vehicle (UAV), running on jet fuel in a parallel hybrid-electric configuration—an innovation that resulted from a U.S. Army xTechSearch competition and subsequent Small Business Innovation Research (SBIR) award. Meanwhile, the U.S. Army has awarded LiquidPiston contracts for development of a tactical power generator, and the U.S. Air Force has awarded LiquidPiston a Small Business Technology Transfer (STTR) award for the development of a next-generation drone engine.

These U.S. Department of Defense (DOD) contracts total almost $10 million to date—striking progress for a young company tackling a hard science problem. In addition to the DOD, LiquidPiston has received and successfully delivered on four feasibility study contracts with industrial companies for aerospace and power generation applications. To build on these initial successes and complete the development and rigorous industrialization process to bring commercially ready products to market, LiquidPiston has taken the unorthodox approach of offering its company stock to private investors. Last time it did this, in early 2020, its Regulation Crowdfunding campaign was oversubscribed in nine hours flat.

Looking ahead, LiquidPiston's leadership team remains confident in its 15 years of research and development experience, including the know-how and capabilities it has accumulated solving some hard science problems. The company already has 64 patents granted and pending. It sees itself as a key disruptor of the $400 billion annual ICE market. In the future, beyond its current phase of military contracts, which focus on aviation power, portable generators and UAV propulsion, LiquidPiston plans to enter a wide range of industrial and commercial, marine, urban mobility and automotive markets.

Since the X-Engine platform can be scaled from 1 to 1,000 horsepower or more, the technology could theoretically improve the efficiency and carbon neutrality of any ICE application, from industrial-scale transport all the way down to personal appliances. Over the coming years, we may see LiquidPiston engines not only in hybrid electric cars but also in jet aircraft, mopeds, motorbikes and even power tools and gardening equipment.

While it may be difficult to envision a single engine revolutionizing such a vast spectrum of industries, the strangest part is that, across more than a century of development, no one had previously thought to reimagine the internal combustion engine by working through the fundamental physics of the thermodynamic cycle. Like many world-changing inventions, the X-Engine seems simple and obvious in retrospect—and ultimately, it may be that very fact that makes it so compelling to so many potential customers and investors alike.

View LiquidPiston's Offering Circular here: and the risks here:

This RegA+ offering is made available through StartEngine Primary, LLC, member FINRA/SIPC. This investment is speculative, illiquid and involves a high degree of risk, including the possible loss of your entire investment.