In 2001, Shawyer founded "Satellite Propulsion Research Ltd", in order to work on the EmDrive, a drive that he claimed used a resonant cavity to produce thrust without propellant.
Shawyer founded "Satellite Propulsion Research Ltd", a drive that he claimed used a resonant cavity. This was in 2001. This was to produce thrust without propellant. This was to work on the EmDrive.