A functioning impulse drive has been invented by Dennis J. Plews. He named the device Star Drive Propulsion. It uses rapid, successive impulses of force to generate controllable thrust. Currently under development, numerical simulations of a prototype design suggest that this impulse StarDrive Propulsion Â¿ system has the capability, when powered by a sufficiently potent energy source, to accelerate spacecraft to near light speed velocity. The proof of concept version, information about how the first impulse drive device generates thrust and test videos showing it working can be seen at Scientific AmericanÂ¿s World Changing Ideas Video Contest web site, http://www.scivee.tv/node/17540.