Most the balloon rises through the hot air propane burner installed in the mouth. The envelope or cover, is made of synthetic fabric treated with polyurethane to minimize leakage. Cover hangs a basket or basket, which carries the pilot and passengers.
Inflation has two phases. First extends balloon on the ground and slid into the cold air with a large fan. Then, with a propane burner hot air is blown partially inflated envelope. straightening hot air balloon , who remain tied to the ground until the pilot is ready for takeoff.
Once in the air, it can make it up by operating the burners and adding more hot air. To lower you only need to wait for the air to cool or open a valve at the top, which free hot air. The balloons are just flying fuel to stay a few hours, usually less than 600 meters high, therefore, the aeronaut and the ground crew that follows it must find a safe place to land, one in which there are no cables electrical and that is away from busy streets.
Other balloons are helium or hydrogen. Unlike hot air, they can remain suspended for several days.
balloons can not go, move at the mercy of the winds. However, an experienced balloonist can control the device by varying its altitude, until you find a current to drive in the desired direction.
Source:
http://www.planetacurioso.com/2009/07/31/% C2% BFcomo-run-the-balloons-balloons /
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