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Rotary Piston Engine


A rotary piston combustion engine

Tech Area / Field

  • NNE-BCM/Batteries and Components/Non-Nuclear Energy

3 Approved without Funding

Registration date

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov


  • Universidad de Jaén, Spain, Linares\nNissan Motor Co., Ltd., Japan, Tokyo

Project summary

The work under this Project belongs to the area of propulsion engineering, namely, to rotary piston combustion engines with a planetary rotor.

The objective of the Project is to design, fabricate and test an experimental prototype rotary piston combustion engine for automobiles. The work in this area was initiated in 1971 by the developers and designers of this project.

As of April 2006, there is a package of draft drawings and schematic diagrams of the engine, a video with simulation of its operation (web-site: STP.WEBHOL.RU), patents and exhibition certificates.

The project manager and leading project participants are sure that tomorrow is with internal-combustion engines, displacement compressors, rotary hydraulic units and pumps. The grounds for this include their simple design, absence of reciprocal motion of engine parts and better weight and size features.

This rotary piston engine design will to a great extent make it possible to solve the following problems of fundamental importance, which are typical of such engines:

  • High and non-uniform heat load of the stator;
  • Low reliability of seals and their increased wear and tear;
  • Low efficiency of fuel burning;
  • Flow-over of the working medium between engine spaces and, as a result, high fuel consumption;
  • Highly toxic exhaust emissions.

The engine design proposed is simpler than the Wankel design, it has a simpler shape of wall surfaces and, consequently, is easier to manufacture and does not require special process equipment.

The shape of combustion chambers of the engine proposed facilitates the process of fuel combustion; that is why the engine is expected to have lower fuel consumption and to be more environmentally safe. Thus, there are no fundamental difficulties in making a diesel modification of the engine.

The design of the sealing in the engine stator is fundamentally important for the development and use of this type of rotary piston combustion engines.

The final result of the project (and its success) will be a reliable start of the designed and fabricated experimental prototype rotary piston engine and its smooth running for 10 to 60 seconds. This project result will confirm the ability of the proposed engine design to function. The engine design will use a simplified feed, lubrication and cooling system. The project does not provide for any measurements of the engine’s power, heat and other parameters. Neither does it provide for design finishing of parts, units and the engine as a whole.


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