Propane-fueled burners provide this to lift balloons; politicians make their own
... hunting down propane tankers, and savoring the exhilaration that 
... with their chase crews, although Mr. Tetreault said his own crew chief is ... 
hand to give tethered rides to children in a balloon bearing the logo... [DOC] [TLE] The Hot Air Balloon Burner - eballoon.org [PAR] It is what propels the hot air up into the envelope to make the balloon move ...