Roziere balloon

A Roziere balloon is a mixed helium / hot air balloon. It takes its name from the person who invented the principle which consists of simultaneously using the properties of hot air and the properties of gas "lighter than air" gas: François Pilatre de Rozier, who designed and produced the first model in 1784.

This aerostat has an envelope inflated with helium that can be dilated using of a cone of hot air created by using a burner. The advantage of the Roziere balloon is its low energy use compared to a classic hot air balloon, because all that is needed is to maintain the optimum dilation of the helium pocket.