Hear, hear.
In the pulse jet engine the combustion pushes a considerable amount of the fuel/air mix (the charge) out the rear of the engine before it has had a chance to burn (thus the trail of flame seen on the V-1 flying bomb).
I'd wondered about that, as I was sure my young eyes were seeing a fairly steady 'cigar shaped' light in the sky.
Got thrown under the bed one night when the pulsing noise stopped.