24-Inch High Speed Tunnel (24-Inch HST). Foundation for the tunnel. Construction was authorized in 1933 and was built using funds from the Federal Public Works Administration (PWA). The initial cost was $12,600. Eastman Jacobs, John Stack, Ira Abbott, W.F. Lindsey and Kenneth Ward participated in the design of this new tunnel which could investigate airfoils and fuselages at twice the Reynolds numbers of the 11-inch HST. Published in NACA TR No. 646, "The Compressibility Burble and the Effect of Compressibility on Pressures and Forces Acting on an Airfoil," by John Stack, W.F. Lindsey, and Robert E. Littell, 1939; James R. Hansen, Engineer in Charge, NASA SP-4305, p. 452.
