Vought O3U-1 "Corsair" in Full-Scale Tunnel (FST). This photograph was taken in September 1931 after the balance had been enclosed. This aircraft was also used earlier during the summer for preliminary tests in the FST and as the subject of some of the first publicity photographs taken of FST operations. NACA engineers checked the lift and drag characteristics of several aircraft with the results of earlier flight tests. Smith DeFrance concluded NACA TR No. 459, "The agreement that has been obtained between the flight and full-scale tunnel results, together with the consistent manner in which measurements can be repeated when check tests are made, has demonstrated the accuracy and value of the equipment for aeronautical research." (p. 298)
