NASA’s Armstrong Flight Research Center is currently in the process of uploading hundreds of extremely rare films to YouTube. The center has uploaded roughly 300 of the planned 500 films that it will continue to put up over the coming months. They have everything from 1950s experimental aircraft like the X-3 Stiletto to 1960s Lunar Landing Research Vehicle tests to videos of the time that they intentionally crashed a Boeing 720 in 1984.
Here are just a view samples:
Watch a hypersonic plane go 7,000 miles per hour and more in over 500 videos of experimental aircraft pushing the limits.
This 29-second video taken in the 1970's shows a C-5A aircraft undergoing a wing vortices test at NASA's Langley Research Center, Hampton, VA.
In this 2001 video, a X-40A Space Maneuver Vehicle is hauled up by helicopter to 15,000 feet and dropped, free-falling in a graceful, autonomously controlled 75-second descent. This one comes complete with video from a camera aboard the vehicle as it falls.
A lot more videos you will find here
https://www.youtube.com/user/DrydenTV/videos
https://www.nasa.gov/centers/armstrong/videos/index.html
wow