LiquidPiston Enters the UAV Arena with a Revolutionary Rotary Engine

On March 6th, LiquidPiston Inc., an advanced internal combustion engine technology company, announced its intention to enter the UAV market with a revolutionary rotary engine aimed at powering medium-sized drones. As part of the company’s push into the UAV market, it presented at the Starburst Accelerator’s Selection Committee in Israel on Wednesday, March 7th. The invitation-only event brings together highly disruptive companies in the aerospace industry every year to present to representatives from global and local aerospace corporations, defense industry officials, venture capitalists and leading university faculty.

LiquidPiston has spent a decade-plus reinventing the rotary engine that Felix Wankel created in 1960 and that Mazda is rumored to be bringing back to life in 2019. In an exclusive interview with Alexander Shkolnik, CEO and Founder of LiquidPiston, we had the opportunity to inquire about the technology in general and the announcement in particular.

Juan: Tell us about LiquidPiston technology.

Alex: LiquidPiston has reimagined combustion engines with a platform that can run on multiple fuels, including diesel, jet fuel, and gasoline, using an optimized thermodynamic cycle and a new rotary engine architecture. This architecture involves only two primary moving parts, a shaft and a rotor, and corrects the major performance, sealing, and lubrication weaknesses of previous rotary engines such as the Wankel. The ‘X’ engine is fuel-efficient enabling greater than 50 percent increases in flight endurance. Furthermore, the architecture significantly reduces engine vibration, noise, and heat output, which minimizes engine impact on ISR equipment and UAV heat, noise and EMI signatures. The lightweight rotary ‘X’ engine is capable of achieving compression ignition in a single stage at a weight of just 1/10th of typical diesel-fueled, piston engines.

Juan: What compelled you to present at the Starburst Accelerator, and why now?

Alex: We’re excited to present at Starburst Accelerator’s Selection Committee conference in Israel and share our disruptive new propulsion solution with leaders in the UAV and broader aerospace industry in an effort to secure funding and present an alternative to the current power systems available to manufacturers. As the UAV space grows into a $50B-plus market by the mid-2020’s, we believe LiquidPiston’s technology will help UAV manufacturers and operators reimagine unmanned flight possibilities.

 Juan: What makes your rotary engine so different from current internal combustion engines?

Alex: Conventional IC engines have an average power output of 15% to 20% of the energy created by the fuel consumed; our rotary engine has an average of 35% to 40% and it’s ten times lighter. The prototype we are working on for the UAV industry involves only two moving parts, a shaft and a rotor, and corrects the major performance, sealing, and lubrication weaknesses of previous rotary engines such as the Wankel. In addition, this architecture significantly reduces engine vibration, noise, and heat output, which minimizes engine impact on intelligence, surveillance, reconnaissance equipment and UAV heat, noise and EMI signatures.

Juan: Are you promoting the idea that these benefits will increase Time in the Air (TITA)?

Alex: Yes, we expect to publicly test our pre-production engine powering a UAV later this year and prove that the configuration will help drone manufacturers and operators improve flight endurance by 50%+.


As the LiquidPiston draws closer to the first pilot of its propulsion solution on a drone this year, we will be following closely the tests and will report accordingly. It will be interesting to see if alternatives such as a rotary engine can help manufacturers stay in the air longer, thus opening the door for new applications and in preparation for legislation authorizing flights BVLOS.

About the Author

Juan received a degree in Geodesy and a master in digital photogrammetry from Universidad Central de Venezuela and a MBA in international Finance from Florida International University. He has over 750 hours of experience in photogrammetry navigation and camera operation in aircraft as varied as WWII B-25, Cessna 310, Lear Jet 25C and Piper Aztec. Juan holds a Commercial, Multi-engine Pilot certificate. Juan has been selling mapping UAV’s in Latin America for four years and is a frequent guest speaker in events where the safety of flying UAV’s and the fact that unmanned and manned aircraft inevitably will share the same airspace, is a relevant topic. He is the CEO of Juan B Plaza Consulting, a services’ firm specializing in UAV and general aviation issues.

3 Responses

  1. Chuck

    I am amazed at the number of companies still attempting to make improvements on the polluting internal combustion engine while the debut of LENR energy is knocking on the door of their laboratories! Why would they continue to funnel billions of dollars into that rathole? As soon as LENR generators are certified and integrated into an EV, that will mark the end of range anxiety in EVs and do so with zero pollution and virtually no fuel costs! And when that happens fossil fuels will be worthless and the transition will occur almost instantaneously due to global pressure to quell pollution!

  2. Kenny

    Chuck… it has twice the efficiency and weighs 10 times less that conventional IC engines and can fun on flex fuel. EVs aren’t the be all end all solution to our environment problem, just a future environmental problem look up lithium ion battery recycling at the present moment only 5% of lithium ion battery get recycled. LENR, Technology Readiness Level (TRL) assessment for Energy production is still at level 4, there is no way in the world its coming anytime soon.

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