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.

Photographer:

Eric Long

ID#:

2005-24789a

Source:

Smithsonian's National Air and Space Museum

Copyright:

Smithsonian Institution

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