Solar balloon

As solar balloon is called a balloon with darker casing, which is filled with normal ambient air. The darker the shell, the better it absorbs the energy of the sun rays that hit it (absorption ) and heat up thereby. By convection from the shell are a part of the heat to the air in the balloon inside, which thereby also heats up. Because heated air is less dense than cold air, is formed in this way, a lift, which can fly the balloon. A solar balloon is thus a hot air balloon, which is not heated with fire, but with solar heat. In order for the solar balloon is practically a flying solar collector. Solar balloons float silently with the air because they have no power other than the sun. Since they do not require fuel, they can fly in good weather much longer than regular hot air balloons, whose enormous heating gas consumption forces them already after 1-2 hours to land. Compared with normal solar balloons hot air balloons develop but less lift at the same balloon volume, so must be built larger for the same load capacity. Typically, solar balloons are made ​​of black plastic film can be made ​​during normal hot air balloons made ​​of thermally and mechanically belastbarerer balloon silk. The most obvious disadvantage is the dependence of the solar balloon of sunny weather. In addition, pure solar balloon for passenger transport are not suitable because they would quickly lose and fall already with clouds to lift. Due to this upcoming fall wind they would lose more float and sink faster, because as the sun heats up the balloon, every breath of wind cools it off. Solar balloons are therefore extremely sensitive to wind. Nevertheless, larger solar balloons were realized in the past that have also promoted people. Largest ever solar balloon was used by the Romanian Space Agency ARCA with the intention to lift rockets to launch relief in the stratosphere. Unfortunately, virtually all the larger solar balloon individual projects of enthusiastic recreational hobbyists, groups of pupils or students. To buy, there has been only very small solar balloon as children's toys.

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