A launch lug affixed the model in such a way that it comes off the model as it clears the launch rod or rail. Pop 'n Go Ignition: A technique whereby a powdered chemical accelerant is poured over an igniter placed in the nozzle to insure ignition. Typical accelerants include Black Powder, Photographer's Flash Powder etc. So called because of the distinctive "pop" that occurs when the mixture is ignited. Can be dangerous if too much powder is used since this can potentially damage the nozzle and thereby cause a catastrophic motor failure (CATO).