Method of making a thruster device for solar radiation

A method of manufacturing a Thruster device having frustoconical inner and outer layers, the inner and outer layers each having inner and outer surfaces and opposing entry and exit ends, the entry end of the inner layer having a diameter that is less than a corresponding diameter of both the entry end and the exit end of the outer layer, the method comprising:

• forming a spiral flow passage in at least one of the inner and outer layers;
• positioning the exit end of the inner layer proximate the entry end of the outer layer to define a diameter gap therebetween along a plane perpendicular to a central axis;
• advancing the inner layer along the central axis such that the diameter gap decreases;
• nesting the inner layer within the outer layer such that the spiral flow passage is defined therebetween;
• and
• attaching an outlet to at least one of the inner and outer layers such that said outlet is in fluid communication with said spiral flow passage.