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If your application calls for highly efficient power, compression, or pumping in a lightweight device and/or small footprint, RadMax has a solution for you!

RadMax patented technology is a family of smaller, lighter and more energy-efficient prime movers, compressors, pumps, expanders and combined devices designed for Simplicity, Efficiency and Power. RadMax Technologies devices are easily configurable to meet the needs of diverse applications and requirements.

RadMax Rotary Principle
The RadMax rotary principle is unique. As many as 12 straight vanes reciprocate parallel to the axis of rotation through a rotor and compress or expand fluids in the same manner as reciprocating piston devices. The rotating, reciprocating vanes follow the sinusoidal surfaces of stationary cams in the end housings, forming chambers on both sides of the rotor between the rotor, stator walls and vanes. The chamber volume changes as the vane follows along the cam profile during the rotor’s revolution, resulting in alternately compressing and/or expanding fluids at both cam locations, depending upon the device’s application. The desired device configuration is accomplished through the flexible placement of simple intake and exhaust ports in the cam, instead of having to use complicated valve systems.

Because the upper and lower faces of the rotor are 90-degrees out of phase, and the vanes move parallel to the direction of rotation, a RadMax device is always balanced and exhibits nominal vibration. A minimum of energy is lost due to reciprocating motion and accelerations unlike piston devices.

One Technology, Multiple FunctionsBy simply changing the cam profile and/or intake and exhaust porting locations, a RadMax device can be designed as an internal combustion engine, compressor, pump, gas expander, or a combination of these functions.


  • Low parts count with only two unique moving assemblies, the vanes and rotor, resulting in reduced component, assembly and maintenance costs, increased reliability, and reduced noise
  • Device family parts are mirror image parts and are typically interchangeable
  • Rotary motion input and output porting does not require complicated valving systems
  • Easier field maintenance and repair 


  • Continual, smooth rotary motion 
  • Compact, lightweight design
  • Easily scalable; volume capacity grows geometrically
  • Multiple devices in one compact unit
  • Agile technology easily modified for multiple devices, uses and applications
  • Larger expansion to compression ratio capability results in a longer power stroke and greater fuel efficiency


  • Up to 48 power, compression, expansion or pumping actions per revolution 
  • High compression ratio capability makes it adaptable for use with many fuel types