High-pressure fluid, directed through pressure-balanced port facings to the rotor's axial cylinder bores, force half the pistons to roll down the cam slopes, producing rotation.
As the rotor turns, the remaining pistons roll up the cam slopes, expelling the fluid between them to the low-pressure return ports.
Each of its nine pistons go through four complete cycles per revolution resulting in 36 power strokes. Parabolic-cam contours produce constant, ripple-free torque.
Peter Chalk, Nutron Motor Co. Inc., (F), Box 370, Eliot, ME 03903; (207) 439-5272.