Editing Transonic (section)

=== Discovering transonic airflow===
Issues with aircraft flight relating to speed first appeared during the [[Supersonic speed|supersonic]] era in 1941.<ref name=":35">{{Cite web|title=Mach 1: Assaulting the Barrier|url=https://www.airspacemag.com/history-of-flight/mach-1-assaulting-the-barrier-22647052/|access-date=14 March 2021|website=Air & Space Magazine|language=en}}</ref> Ralph Virden, a test pilot, crashed in a fatal plane accident.<ref name=":23">{{Cite book|last=Vincenti |first= Walter G.|url=http://worldcat.org/oclc/1027014606|title=Engineering theory in the making: Aerodynamic calculation "breaks the sound barrier."|date=1997|oclc=1027014606}}</ref> He lost control of the plane when a shock wave caused by supersonic airflow developed over the wing, causing it to stall.<ref name=":23" /> Virden flew well below the speed of sound at Mach 0.675, which brought forth the idea of different airflows forming around the plane.<ref name=":35" /> In the 40s, [[Kelly Johnson (engineer)|Kelly Johnson]] became one of the first engineers to investigate the effect of compressibility on aircraft.<ref name=":35" /> However, contemporary [[wind tunnel]]s did not have the capability to create wind speeds close to Mach 1 to test the effects of transonic speeds.<ref name=":23" /> Not long after, the term "transonic" was defined to mean "across the speed of sound" and was invented by [[National Advisory Committee for Aeronautics | NACA]] director [[Hugh Latimer Dryden|Hugh Dryden]] and [[Theodore von Kármán]] of the California Institute of Technology.<ref name=":35" />