Reblogged from scanzen
A technician prepares to unlatch the door built into the guide vanes of the 16-Foot Transonic Wind Tunnel at NASA Langley Research Center, Hampton, Virginia.
The tunnel, one of dozens of research facilities at Langley, was built in 1939 and renovated in 1990. Operating transonically or across the speed of sound, the air in the test section travels from about 150 to 1,000 miles per hour. The tunnel is called the “16-Foot” because its test section is approximately 16 feet in diameter. The guide vanes, which form an ellipse 58-feet high and 82-feet wide, cut across each cylindrical tube at a 45 degree angle.
Photo: Bill Taub/NASA