The 3-cm-by-4-cm shock tunnel,
3x4STN, is a SHOCK TUNNEL which is modified the 3-cm-by-4-cm shock tube, 3x4ST, by installing
a supersonic nozzle. The 3x4STN is able to generate supersonic
flow field around models of supersonic transport, launch vehicles, and planet proves at the test section. The 3x4STN is used for validation of numerical results, optical flow visualization and
fundamental research on short-duration-flow measurement techniques.