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Do 30 dni za vračilo
Balloons of all classes, while in equilibrium or moving vertically, are discussed fully for the information of pilots; in addition the subject is treated mathematically for students at aeronautical schools. At the time of the original publication the author was Professor of Aeronautical Engineering at Massachusetts Institute of Technology; Secretary of the Sub-Committee on Aerodynamics of the National Advisory Committee for Aeronautics; and Member of the Society of Automotive Engineers.