My foundry friend has a hand injury, so I offered to run his furnace and pour some 356 aluminium for him. He runs a propane gas fired furnace with a 25 sized silicon carbide crucible and uses a one man pouring shank. The crucible takes a full ingot to fill, the stack beside the furnace are ingots sawn into three pieces to give some indication of size. I poured four crucibles over 5 hours, there was a lot of initial setup of the sand moulds and then waiting for the aluminium to cool before setting up the next batch for pouring. The furnace once it's hot will melt a full A25 crucible in 12 minutes, I noticed that even with it hot but not running, it could melt 1/3rd of an ingot with residual heat alone. By the second pot, I could feel my upper back muscles starting to complain. Anyway it was a great way to help out a friend and get some aluminium casting experience, I had a 100% success rate with no bad castings even on the thin sections. My chrome leather welding apron had a 30cm/1' extension fitted on the bottom so that the leather reached the top of my boots and I wore welder's spats over my leather boots. Judging by the burn marks on the lower apron from aluminium splatter, the extension was well worth it and even protected the leather welder's spats from burns. The long apron didn't get in the way at all, you have to crouch and hunch over at the same time to be able to trip on it with your boots.