Can a pulse jet engine be built with a resonant frequency of 17 hz?
I found an analysis of the German “Buzz Bomb” pulsejet engine, which compares the engine to an organ pipe. The oscillations will be 1/4 wavelength, and the following equation applies f = aStar / (4*L) where f is the frequency, aStar is the speed of sound through the medium, and L is the length of the pipe. Note that the medium is air/fuel mixture in the process of combustion, not just regular air at room temperature. Using 1120 ft/sec as the speed of sound, the tube should be about 16.5 feet long.