Lots of variables, of course--but...............MJD wrote: Probably safer than starting a large pulsejet up close, esp. on gasoline.
A decent pulsejet tops out at less than 2.5 atmospheres.
I'm concvinced that moderate pressures are one of the pluses, that make pulsejets a reasonably safe hobby.
Of course there's always a way to make it more dangerous than it should be!!
Acoustic Propulsion Concepts
".......some day soon we'll be flying airplanes powered by pulsejets."