Steve Fossett, who in 2002 manned the first succesful solo round-the-world balloon flight. The balloon was called the "Solo Spirit" and is described this way:
"The Solo Spirit balloon uses a combination of helium and hot air to fly, a design known as a Roziere balloon. The balloon envelope is 140 feet tall and 60 feet wide. It contains 550,000 cubic feet of helium plus 100,000 cubic feet of hot air."

Oh- and here's the link to the details of the "Solo Spirit."
http://solospirit.wustl.edu/flight.html

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