superpressure balloon

aircraft

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balloon flight

  • Albuquerque International Balloon Fiesta
    In balloon flight: Superpressure balloons

    Polyester film at a tensile strength of 1,400 kg per square cm (20,000 pounds per square inch)—compared with polyethylene at a tensile strength of about 40 kg per square cm (600 pounds per square inch)—finally made it possible to produce superpressure balloons, which…

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