History: How NASA tested aircraft prototypes before there were wind tunnels. 1921 [1536 x 1126]

https://i.redd.it/vxvk82fpywsx.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/58qeev/how_nasa_tested_aircraft_prototypes_before_there/?utm_source=ifttt