In the early 1970s and under this name, advanced valveless pulse jets were designed for high and low speeds.

“Messerschmitt pulsejet”

From Appendix 6: During the 1950’s there was an engine for a vehicle designed by Dr. Billy Messerschmitt (the P-511), very curious because to be a land vehicle it was a radial according to the aeronautical style.

“Radial for the Me.P-511, 5 cylinders"