Rozière balloon 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, 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 and Hageman in the balloon "Dutch Viking". During February 1992, the first east-to-west Atlantic crossing was achieved by
Hot air balloon indicators would be useless) and direction. The combined mass of an average system can be calculated as follows: using a density of 0.9486 kg/m³ for dry air heated to 210 °F (99 °C). Increasing the air temperature inside the envelope makes it less dense than the surrounding (ambient) air. The balloon floats because of the buoyant force exerted on it. This force is the same force that acts on objects when they are in water and is described by Archimedes' principle. The amount of lift (or buoyancy) provided by a hot air balloon depends primarily upon the difference between the