This Is a prototype of an pulse jet I have created, and is designed to last at least a minute of use, and the actual finished model would be aluminum, and have servo to control fuel flow (propane), but this is just a proof of concept.

This model needs 4 M5x0.8 x 100mm hexagon socket head bolts, 4 hexagon thin nut M5x0.8, 1 M4x0.7 x 6mm hexagon socket head bolt, 1 thin nut M4x0.7, 1 RC N3 glowplug, and a blowtorch with a 16mm nozzle (out diameter)