MAM Fieseler V1 Flying Bomb engine run.

The Military Aviation Museum in Pungo, Virginia has just test run a modern replica of the Argus As 014 pulse-jet engine used on a WWII-era Fiesler Fi-103 guided missile, perhaps better known as the V-1 ‘Doodlebug’ or ‘Buzz Bomb’. The V-1, as most of you will know, was one of Hitler’s “Vengeance Weapons” with which the Third Reich attempted to exact revenge upon Allied civilians. 

The distinctive sound of the engine did indeed cause serious alarm to anyone who heard it during the war, but it was the sudden silence that followed the engine shutting down that was worthy of true terror, as it meant that the weapon, with its 850 kilogram, high explosive Amatol warhead, was about to strike in the immediate area. It didn’t care who, or what, was in its path. This was the dawn of the drones…

http://www.warbirdsnews.com/warbirds-news/v-1-pulse-jet-engine-runs-military-aviation-museum.html