http://www.engineair.com.au/airmotor.htm
The Di Pietro Motor (Rotary Air Engine)
"There is no other motor as good as ours, years of research and analysing other motors around the world gave me the confidence and obligation to say so. Obligation in the sense that people have been waiting for ages in relation to efficiency in order to take care of our environmental situation.
100% more efficiency than our competitor is a very serious claim and should not be confused with some kind of publicity stunt were the interest is purely to try and make money out of some ridiculous claim.
The invention has a long list of important improvements over other motors.
The concept has the capability to change the method we use for transportation, apart from the benefits of energy saving in stationary applications.
We have verification of its performance
We have patents issued
It has outstanding efficiency
It has constant high torque
It has low parts count
It has low number of moving parts
It is compact and light
It has virtually no friction
It has virtually no vibration
It has smooth speed control characteristics
Only 1 PSI of pressure is needed to overcame the friction
THAT'S CORRECT ONLY 1 PSI !!