F-117 on ice at McKinley Climatic Laboratory #avgeek
GE testing jet engines against ice in Canada
The Bell D-188A (unofficial military designations XF-109/XF3L) was a proposed eight-engine Mach 2-capable vertical take-off and landing (VTOL) tiltjet fighter that never proceeded past the mock-up stage.
via alternathistory and bassman5911
As close as you will ever be to a nuclear explosion
or at least as close as i hope to get
Fluorescent oil sprayed onto a model in the NASA Langley 14 by 22-Foot Subsonic Wind Tunnel glows under ultraviolet light. Airflow over the model pulls the initially even coat of oil into patterns dependent on the air’s path. The air accelerates around the curved leading edge of the model, curling up into a strong lifting vortex similar to that seen on a delta wing. At the joint where the wings separate from the body those lifting vortices appear to form strong recirculation zones, as evidenced by the spiral patterns in the oil. Dark patches, like those downstream of the engines could be caused by an uneven application of oil or by areas of turbulent flow, which has larger shear stress at the wall than laminar flow and thus applies more force to move the oil away. Be sure to check out NASA’s page for high-resolution versions of the photo. (Photo credit: NASA Langley/Preston Martin; via PopSci)
An Apollo Launch Escape System test vehicle being prepared for launch, 1963.
Such tests are still performed today, such as this 2010 Orion LES test.