Very similar to the larger Furnace helm, this helm propels a vessel by drawing on the power of magical items placed within it's fuel opening. Items placed within are burned (literally) by the fire within, and there dweamor is sucked into the helm to give it power. The size and shape of the furnace is such that only items no greater than 18" on a side can fit within. The item must fit entirely within to begin burning (a thick leather glove is used to protect the hand while adding fuel). Each 100 xp of value provides 12 hours of power. Minor Furnace Helms can helm ships of up to 20 tons in size. They commonly come in two varieties: lifeboat version-SR1, can attain spelljamming speeds, relatively cheap. Fighter version-SR4 but can not attain spelljamming speeds.
These helms are used extensively within spheres (they explode in the philogiston, of course) to power fighters, lifeboats, harbor ferries, ect. Most are fueled by scrolls with continual light or some other common spell inscribed upon them. In my game I even allow them to be fueled for an hour or so if a piece of wood or paper with a Magic Mouth, Continual light, or even Nystul's Magic Aura spell has been cast (as oppossed to inscribed) on them.
Cost: 20,000 gp (SR1); 50,000 gp (SR4)
