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Rand Cam engine

edited 17 May 2014

there is an investigation paper done by NASA on this engine, I will try to locate it and post it here.
there is also a forum discussion this engine, there are real life calculations on it performance.

for here he is an old news piece about it.


Here is a very small fracture mechanics Circular vane engine .

all ready underdevelopment for the US military , 6 inch by 6 inch by 6 inch 24 detonations per revolution

  • 6 inches dia.
  • 6 inches long
  • 42 hp at 7000 rpm
  • 40lbs.
  • Tested at NAVAIR PSEF Oct. 2003
  • Cylindrical rotor with integrated drive shaft
  • Axial vanes move sinusoidal
  • Cams on each end of the rotor guide the axial vanes
  • Major moving parts: rotor and 12 axial vanes
  • Symmetric design forms 24 combustion chambers


  • More powerful and fuel-efficient than current reciprocating engines, yet less expensive to maintain.


  • Only 2 moving parts, the vanes and the rotor – no pistons, valves, etc. – reducing assembly and maintenance costs.


  • Provides up to 24 power strokes per revolution. The stroke length of a reciprocating engine is approximately 3.5″, and one power stroke is generated for every two revolutions. The RadMax™ Engine has a stroke length of approximately 14″, and its unique design provides 12 power strokes per revolution.
  • Calculated at 30% volume efficiency, compared to Wankel engine’s 10% volume efficiency, compared to piston engine 7-8% volume efficiency.


  • Fully scale-able, the 42 hp diesel engine version is only 6″ in diameter by 6″ long.


  • Ethanol, Natural Gas, Propane, Diesel and even Hydrogen Fuels including mixtures.


  • High firing frequency resulting from 24 combustion per revolution virtually eliminates exhaust and intake noise.

here is the company’s website



Search  words

Complete torque – full torque – continues torque – torque engine. Toroidal engine – Toroidal motor.
Piston less Engine  – Piston less Motor – Cam less Engine – Cam less Motor –


1 Comment

  1. hi!
    i’m doing my science fair project on redesigning the rotary diesel engine and i was wondering if you could help me. any information or tips would be greatly appreciated.

    Comment by jacquelyn Schodlbauer — November 23, 2010 @ 6:28 am

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