Sisu 1A

The Sisu 1A is a competition sailplane built in the United States in the late 1950s and early 1960s.

Niemi formed the Arlington Aircraft Company for this purpose.

The Sisu 1A quickly proved itself as the most competitive American sailplane ever developed, winning the 1962, 1965, and 1967 U.S. National Soaring Championships.

On July 31, 1964, a Sisu 1a piloted by Alvin H. Parker became the first sailplane ever to fly farther than 1000 km.

[2] Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[3]General characteristics Performance

Electronic copy of the original invitation (front) to attend the dedication of the Sisu 1A to the Smithsonian in 1968.
Electronic copy of the original invitation (back) to attend the dedication of the Sisu 1A to the Smithsonian in 1968.
Sisu 1A three view drawing
Bill Ivan prepares his Sisu 1A for competition at the 30th National Soaring Championships at Harris Hill, NY in July, 1963.