Pulse jets are cool, I built a few in my youth in hopes of using one in a R.C. plane. Small scale didn't use shutters but more of a reed valve and ran on gasoline. No fuel pump so you had to pressurize the fuel tank to 25psi.
The first one used a spray can as the combustion chamber. A model"T" buzz coil and a blast of compressed air through the intake was all it took to get started. It is still to this day the loudest thing I have ever heard!! It had everybody in the neighborhood looking. Clamped in a vise in my dad's garage, 4 foot blue flame out the back it was cool until the combustion chamber started to melt and fuel started spraying out over the work bench. Boy was dad mad that day!!!