Ultralight Aircraft National Air and Space Museum

The concept of gliders propelled by small engines emerged in the 1920s, but didn't rise in popularity until the 1970s. 

Piper PA-18 Super Cub (1950) in Steven F. Udvar-Hazy Center of

2009アメリカ滞在記

Great aviation museums—Northeastern US - AOPA

List of aircraft in the Smithsonian Institution - Wikipedia

National Air and Space Museum, Smithsonian Institution - Today in

AVI Aircraft Archives

Piper J-3 Cub, National Air and Space Museum Steven F. Udv…

航空宇宙博物館・別館 くーま、DCを行く。8日目 : くーまくーま・旅のはなし

Modern Aviation - Deutsches Museum

Piper J-3C-65-8 > National Museum of the United States Air Force

航空宇宙博物館・別館 くーま、DCを行く。8日目 : くーまくーま・旅のはなし

Pterodactyl Ascender - Wikipedia

Aeronca L-3B Grasshopper > National Museum of the United States

What Made This First Homebuilt Airplane So Dangerous?