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. 

Big Radials Grumman JRF-6 Goose - NC 702A - Smithsonian National

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

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

Steven F. Udvar-Hazy Center National Air and Space Museum

Great aviation museums—Northeastern US - AOPA

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

2007 ICP Savannah Ultralight Aircraft (WITHDRAWN) - AvPay

Smithsonian Air & Space Museum, The Steven F. Udvar-Hazy Ce…

The AC-35 Autogiro could fold back the rotors and switch engine

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

Powerhouse Collection - 'STOLaero' aircraft designed and made by

Resurgam II ultralight aircraft; H25068.1 - Queensland Museum

The Mitchell U-2 Superwing Showed How Versatile an Ultralight Can