Thrust from Microwaves - The Relativity Drive

Roger Shawyer has developed an engine with no moving parts that he believes can replace rockets. The device is an engine that generates thrust purely from electromagnetic radiation — microwaves to be precise — by exploiting the strange properties of relativity. It has no moving parts, and releases no exhaust or noxious emissions. Potentially, it could pack the punch of a rocket in a box the size of a suitcase.