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The air inside the balloon is heated by greenhouse effect and the black screens pick up the energy that has gone through the transparent polyester film.

For manned solar free flight, Dominic Michaelis chose to build a balloon with a double envelope : Dominic Michaelis commissioned Cameron Balloons in Bristol to make for him : - a black balloon 3000 cubic meter (104'000 cubic foot) built of polyester (Dacron®), - a transparent balloon 4000 cubic meter (140'000 cubic foot) made of double layer transparent (Melinex®). The transparent outer skin consists of two transparent films with, inserted between them, a layer of glue coated reinforcing…

hot air balloon styled after UP (underlying balloon print + real balloons tacked on the outside)