Quote Originally Posted by AccutaneT View Post
Sorry, what you mean?
The V-1 rocket was used by Germany to hit targets in England during WWII. It was of little strategic value as it turned out, but was an effective weapon of terror. Using a pulse jet engine, the V-1 used a simple autopilot, gyrocompass, and gyroscope to head for a target. A unique wind-driven odometer was used to arm the warhead after the rocket had traveled the correct distance, which additionally shut off the pulse jet and locked the controls in a steep dive. People could hear the rocket coming, and when the engine quit, they would know it was going to hit soon. When you listen to the audio file at the link, you can hear the pulse jet "buzzing" and then the sudden stop as the warhead is armed, followed by a few seconds of silence and then the explosion.