A pulse jet is a not a pulse detonation engine
A pulse jet as used in the V-1 is not a pulse detonation engine. The fuel/air mixture in the pulse-jet deflagrates ie the combustion is controlled by a flame front, as opposed to the PDE where the mixture detonates due to the passage of a shock wave.
Pedantry?
Deflagration is sitting in front of a warm toasty fire in your front room, detonation brings the house down around your ears.


