Jan 8 1947

From The Space Library

First experimental operation of model slotted-throat wind tunnel. Langley Laboratory's Ray H. Wright, working theoretically, and Vernon G. Ward, working experimentally with a parasite tunnel attached to the Langley 16-foot high-speed tunnel, collaborated In an effort that resulted in establishment of transonic flow with the use of longitudinal slots in the walls of the throat of a conventional subsonic tunnel. Known as the slotted-throat technique, first major installation was made in the Langley 8-foot subsonic high-speed tunnel in December 1949, a breakthrough in wind tunnel technique.