The spherical piston radial action engine by Dale
consists of ball pistons rolling on an eccentric track.
This process actually has the ball pistons moving in and
out of the cylinder in the radial direction with no contact
with the cylindrical walls. This process basically
eliminates all reciprocating forces inside the engine
system. The ball piston engine’s key benefits include a
minimum number of moving parts, high power to weight
ratio, and excellent dynamic balance