BROOMFIELD, Colo.--(BUSINESS WIRE)--Escape Dynamics, Inc. announced successful tests of their thruster powered by beamed high power microwave energy, with performance greatly surpassing the limit of chemical combustion rockets. Specific Impulse (or Isp) is a measure of rocket or jet engine efficiency, much like miles-per-gallon for cars. While chemical rockets top out at around 460s Isp, static thrust tests conducted in the company’s lab in Colorado using helium demonstrated an Isp above 500s.