... To concur with Goudie I too as a boy can still recall the sound of
German bombers overhead at night as we sheltered under the stairs during the London and Croydon Blitz - Having an ominous and distinctive sound
as if vibrating that we were given to understand was due to the Luftwaffe
flying with desyncronised engines - although I dont think many of us were aware at that time that this was in order to confuse the British system of sound locating.
...