Giant stage fire tornado
Who wouldn't like a three metre column of spinning fire in their science show?
This is a large stage version of a fire tornado that is designed to impress in a large venue. It is about 2.8m high and the spinning column of flame can come out another metre above that (Make sure the ceiling is high enough!).
It is made of welded aluminium and steel with a large base for stability, and the two halves of the tube slide inside one another for transport.
The burner doesn't spin with the tube so that the fuel doesn't get spun out of the sides.
Also:
Demonstration
Commission