1944 the first V1 bomb “Doodle bug” landed on London, codenamed Kirschkern (cherry stone). The name doodlebug or buzz bomb was a phrase that described the sound of the rocket in flight. The V1 was powered by Argus pulsejet engine, this unit pulsed 50 times per second making the distinctive and chilling sound to those who heard it.
When the engine stopped the flying bomb would then descend to earth and explode. It was the silence after the motor cut out that would send people to run for cover in the vicinity.
The flying bomb weighed 2 tonnes with a 2,000lb warhead.