V1 sound comes from the pulse jet engine that runs with a "batch mode" cycle, ie there's a valve at the front that opens and closes at something like 30 Hz. Th

V1 sound comes from the pulse jet engine that runs with a "batch mode" cycle, ie there's a valve at the front that opens and closes at something like 30 Hz. The Stuka had the scare sound siren and it had a much higher pitch.