A multiple vane kinetic system that produces variation in enclosed volumes between pairs of radial vane sets independent of each other and coaxial with a central axis within a annular casing that encapsulates the vane sets and operates in a sequence where the vane sets function as rotating links of the mechanism for a pellicular period, which is preceeded and succeeded by another period where either vane sets successively alternate between being a fixed link and a rotating link of the mechanism and during the former period the volumes between vanes remain constant as long as the vane sets have equal angular velocities, otherwise varies at rates proportional to differing angular velocities.; The two time periods are controlled by timing devices actuating the vane sets to be coupled and decoupled with a power shaft and the variation in length of the two time periods makes rotor-dynamic variable displacement machine.