Game-changing balloon technology enables near-global flight
(PHYSorg.com Space & Earth)

After over 20 years of tests and development, NASA`s Balloon Program team is on the cusp of expanding the envelope in high-altitude, heavylift ballooning with its super pressure balloon (SPB) technology. SMD technology investments that enabled development of SPB, the first totally new balloon design in more than 60 years, include improved film and evolution in the balloon design and fabrication. The pumpkin-shaped, football stadium-size balloon is made from 22-acres of polyethylene film-a material that is similar to a sandwich bag, but is stronger and more durable. The SPB is capable of ascending to a nearly constant float altitude of about 35 km for flights lasting up to 100 days, given the right stratospheric conditions. Flying at mid-latitudes, the balloon must be able to endure the pressure changes that result from the heating and cooling of the day-night cycle. NASA expects the SPB to be capable of circumnavigating the globe once every one to three weeks, depending on wind speeds in the stratosphere.