The Republic F84F Thunderjet fighter-bomber used by the United States Air Force was one of several high speed aircraft involved in flight research at the NACA Ames Aeronautical Laboratory (now, Ames Research Center) at Moffett Field, California. Instruments inside the aircraft record large quantities of data on its aerodynamic performance as it is flown by a NACA scientist-pilot through a carefully planned research program. Later this data will be anyalyzed and interpreted by NACA scientists and reports based on their findings will provide valuable information for designers of future aircraft. NACA (now, NASA) is the independent federal government agency responsible for research into the problems associated with flight.