Rotary piston machine

a,b,c a,b,c a,b,c a,b,c a,b,c a,b,ca,b,c a,b,c a,b,ca,b,c a,b,ca,b,cA rotary piston machine includes an enclosure having a cavity therein with arcuate side walls defining a plurality of arcuate recesses and a piston member rotationally disposed in the cavity . The piston member includes opposite ends and configured to rotationally engage the arcuate side walls and the arcuate recesses such that compression chambers are ultimately formed via the piston member ends and cooperatively engaging two arcuate recesses . The two piston member ends and each including first and second arcuate edges and that sequentially engage cooperating first and second edge portions and of respective arcuate recesses , resulting in two relatively large seals between one end of the piston member and an arcuate recess during rotation of the piston member until forming compression chambers , thereby preventing a fuel-air mixture from "leaking" during the formation of the compression chambers , resulting in maximum power output from the rotary piston machine