Before presenting the features of this important class of fluid actuators, it seems useful to describe how I originally became involved.

About 1970, I first met John Yarlott & visited his company, Trish Energetics in Harvard, Massachusetts. There, John demonstrated for me his new Ampflex actuators [further described in the links below] as well as several controlled devices which commercially employed them to useful purpose.

Then shortly after this visit, I happened to be sketching the design for a small 3-cylinder radial air motor to be built for demonstration to graduate students in my MIT subject "Dynamics & Control of Rotating Machine Systems". But to my great surprise, instead of pistons & cylinders, I found myself drawing 3 Yarlott actuators connected flexurally to a central distributor hub & disposed 120 degrees apart ! Thus was born the Dynacycle Air Motor & shortly after, the Dynacycle Corporation, which ultimately acquired Trish Energetics.

The rest of this story is best told via the links below.

Yarlott Ampflex

Dynacycle Air Motor

Pneumatic Arthrobots

Dynaflex Actuator

Other Dynacycle Devices

Dynacycle Twistor

Twistor Devices

Tug &Twist Thermodynamics

Hybrid Suspensions &Mountings

Pneumatic Spherical Joints