The pulse jet is a powerful furnace. While it will not smelt the ordinary recipes, it will melt obsidian into glass that is immune to TNT, melt scrap metal and tools back into ingots, and make steel more efficiently than a standard furnace. It will get VERY hot and ignite nearby flammable materials - keeping it cooled with water is a necessity. While there is no minimum power requirement, the jet requires high shaft speeds. The pulse jet consumes jet fuel to operate, and a rather large amount of it. This machine receives power from below.
(Needs item picture and a sample setup picture)