A Methanol Jam Jar Pulsejet Turns a Simple Jar into a Tiny Engine 🔥🫙 What looks like an ordinary glass jar is actually a miniature jet engine in action. By using methanol fuel, this DIY pulsejet demonstrates how combustion and pressure waves can produce thrust — the same core principle behind early jet engines. Pulsejets work without moving parts. Fuel ignites, rapidly expands, and creates repeated pressure pulses that generate thrust. It’s loud, simple, and surprisingly powerful for such a ba