Abstract: A propulsion system and pump having inner and outer chambers. The outer chamber is formed by a rigid outer shell and a pair of spaced apart end plate assemblies. The inner chamber is located concentrically within the outer chamber and between the spaced apart end plate assemblies. Each end plate assembly has a drive member. Each drive member has a plurality of arcuate openings extending radially and tangentially outwardly from the center. The outer chamber has at least one outer chamber intake valve located on the one end plate assembly and at least one outer chamber discharge valve located on the other end plate assembly. The inner chamber has at least one inner chamber intake valve located on one end plate assembly and at least one inner chamber exhaust valve located on the other end plate assembly. The inner chamber is formed from a plurality of elongated, overlapping, v-shaped plate members longitudinally aligned between the first and second end plate assemblies.