The engine is constructed of two cylinders, one inner and one outer whose inner surfaces are coated with oriented mobility or contractile proteins. In the presence of ATP the cylinders rotate relative to each other. Speed of relative rotation is controlled by the concentration of ATP or by nesting a series of cylinders inside each other.
Power is controlled by adjusting the length of the cylinders.
One advantage of this technology over other macroscopic motors is that it can be used to supply power to prosthetic implants and medical devices without the drawbacks associated with conventional power sources. Other advantages are that the motor operates at room temperature, fuels can be prepared by growing sugar so the motor does not contribute to carbon dioxide pollution and the waste products are biologically safe.