Arlington Sisu 1A at the Steven F. Udvar-Hazy Center

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Leonard Niemi's Sisu is the most successful American competition sailplane ever flown. The Arlington Sisu 1A is on display at the Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center.


Eric Long

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Smithsonian's National Air and Space Museum


Smithsonian Institution

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