 FACT: V1 bombs were powered by a pulse jet. These have no compressor  to force air through the combustion chamber and therefore can only  work if the bomb is already in motion. This is why the V1s had the  catapult launch to force air into the engine. In two scenes showing  the piloted V1s, the engine is started and shown to be running  for several seconds when the bomb is stationary. For a pulse jet,  this would be impossible without outside assistance.