The Perlan Project's Grob G-520
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A repurposed high-altitude spy plane is launching gliders in Grand Forks, ND this week.
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Grob G 520, a turboprop altitude research and reconnaissance aircraft of the German manufacturer Grob Aircraft. In September 2018 a Grob G 520 was used as a tow plane for the record
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The Perlan Project's Grob G-520
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