Rozière balloon
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The advantage of a Rozière is that it allows some control of buoyancy with much less use of fuel than a typical hot air balloon. This reduction in fuel consumption has allowed Rozière balloons and their crew to achieve very long flight times, up to several days or even weeks.
The first Rozière was built for an attempt at crossing the English Channel on 15 June 1785. But when the flame used to keep the air hot ignited the flammable hydrogen, the aircraft exploded, killing both de Rozier and his companion, Pierre Romain.
Today, Rozière designs use non-flammable helium rather than hydrogen. Their primarily application is for extremely long duration flights such as the first successful non-stop round the world balloon flights.
On February 27, 1999, while they were trying to circumnavigate the world by balloon, Colin Prescot and Andy Elson set a new endurance record after flying in a Rozière combined helium and hot air balloon for 233 hours and 55 minutes. Then on March 21st of that year, Bertrand Piccard and Brian Jones became the first to circumnavigate the Earth, also in a Rozière, in a flight lasting 477 hours, 47 minutes. Their records for time and distance remain unbeaten in any kind of balloon. On July 4, 2002, after five previous attempts, Steve Fossett became the first to achieve a round the world solo flight, while also topping his own solo endurance record, also in a Rozière.
