outlet 46 the inlet 45 and outlet 46 for a single stage helical flow compressor turbine would normally be relatively displaced approximately thirty 30 degrees an alignment or locator hole 47 is provided in each of the stator channel plates 32 and 33 and the stripper plate 26 the inlet 45 is connected to the generally horseshoe shaped stator channel 40 by a converging nozzle passage 41 that converts fluid pressure energy into fluid velocity energy likewise the other end of the generally horseshoe shaped stator channel 40 is connected to the outlet 46 by a diverging diffuser passage 42 that converts fluid velocity energy into fluid pressure energy the depth and cross sectional flow area of fluid flow stator channel 40 are tapered preferably so that the peripheral flow velocity need not vary as fluid pressure and density vary along the fluid flow stator channel when compressing the depth of the fluid flow stator channel 40 decreases from inlet to outlet as the pressure and density increases converging nozzle passage 41 and diverging diffuser passage 42 allow efficient conversion of fluid pressure energy into fluid velocity energy and vice versa in a helical flow compressor turbine fluid enters the inlet port 12 is accelerated as it passes through the converging nozzle passage 41 is split into two 2 flow paths by stripper plate 26 then enters the end of a generally horseshoe shaped fluid flow stator channel axially adjacent to the impeller blades 48 the fluid is then directed radially inward to the root of the impeller blades 48 by a pressure gradient accelerated through and out of the blades 48 by centrifigal force from where it reenters the fluid flow stator.