Rozière

A Rozière balloon (or simply Rozière) is a type of hybrid balloon that has separate chambers for a non-heated lifting gas (such as hydrogen or helium) as well as for a heated lifting gas (as used in a hot air balloon or Montgolfière). The design was created by Jean-François Pilâtre de Rozier (1754..1785).

The advantage of a Rozière balloon type is that it allows some control of buoyancy with much less use of fuel than a typical hot air balloon. This reduction of fuel consumption has allowed Rozière balloons and their crew to achieve very long flight times, as much as several days or even weeks.

The first Rozière was built for an attempt at crossing the English Channel on 15 June 1785. The balloon suddenly deflated (without the envelope catching fire) and crashed near Wimereux in the Pas-de-Calais, killing Rozier himself who was riding the balloon.

Presently, Rozière designs use non-flammable helium rather than hydrogen. Their primary application is for extremely long duration flights.

The first successful Atlantic crossing was made 31 August to 2 September 1986, Newfoundland to the Netherlands, by Brink, Brink & Hageman in the balloon Dutch Viking.

During February 1992, the first east-to-west Atlantic crossing was achieved by Feliu & Green.

Four Cameron-R77s made Atlantic crossings, west to east, during September 1992. One was co-piloted by Bertrand Piccard.

Australian adventurer Richard Smith and his co-pilot John Wallington made the first balloon voyage across Australia, in another Cameron-R77 Rozière, Australian Geographic Flyer, on 18 June 1993.

Steve Fossett made the first successful Pacific crossing during February 1995.

On 27 February 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 (the Cable & Wireless balloon) for 233 hours and 55 minutes. Then on 21 March of that year, Bertrand Piccard and Brian Jones became the first to circumnavigate the Earth, in a Rozière known as the Breitling Orbiter 3, in a flight lasting 477 hours, 47 minutes.

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Wikipedia