**3. Conclusion**

A compressed air plant, providing 1.5 lb/sec of dry air at 100 to 115 psig and having a stor‐ age capacity of 1000 cubic feet, has been engineered and built. The system has been operat‐ ing satisfactorily apart from an oil mist problem for which corrective measures are being investigated.

A supersonic blowdown wind tunnel, using air from the compressed air plant and exhaust‐ ing to atmosphere, has also been built to simple, conventional design principles. Nozzle blocks for Mach 3 and parallel duct supersonic diffuser has been installed. Although stagna‐ tion pressure control is manual, the tunnel is designed for operation by only one man. Run time varies from 20 to 60 seconds and test section Reynolds numbers of about 106 per inch may be obtained.

These facilities along with subsonic wind tunnel facilities form the basis of aerodynamic, re‐ search and development works at the University of New South Wales [31-89]
