The burner and fuel system
Hot Air Balloons are powered by liquid propane sprayed out of the nozzles of the "Burner" at high pressure and ignited by a gas pilot light. This intense flame is directed up into the bottom opening of the Envelope or "mouth". There are no fuel pumps on board so the normal tank pressure is enhanced by running the liquid through pre-heat coils at the top of the burner then down to the nozzles at the base of the burner. Modern burners can put out upwards of 40 million BTU's.
High pressure hoses and fittings carry the fuel from the tanks to the burner. These tanks are specially built out of aluminum or stainless steel and most Baskets carry two to six units.
All fuel system components are checked for leaks by the pilot before each flight and must be inspected by an FAA repair station along with the rest of the system every year or every 100 Hrs. of operation.
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