This is the first time I have fired up the forge.
Propane torch will flame out when I fully close lid, it operates fine with the lid in the open position or not quite fully lowered i.e. 1/8" or more gap.
Propane Tip 0.6mm diameter.
Have tried different propane pressures from 7lb to 30lb per square inch and with and without force air from 3 speed 12" desk fan with a 2 gallon bucket used as temp funnel to force the air into the torch.
The forge is made from a large propane bottle. The refractory (3000F) walls ) 2 &1/2" thick.
Forge chamber 12" deep and 9 & 1/2" in diameter.
The hole in the lid is 4" diameter