Since 1956 ARA has provided wind tunnel data of the highest quality by developing and utilising highly efficient, world-class techniques for our global civil and military aerospace customer base.The ARA Transonic Wind Tunnel (TWT) is a closed circuit, continuous flow tunnel with the following operational features;Test section: 2.74m wide x 2.44m high (9ft x 8ft).Four porous walls 22% maximum porosity.Mach number: 0 to 1.4Stagnation pressure: 0.8 to 1.2 atmospheres (standard operation is 1 atmosphere)Reynolds number: 3.5 to 16.7 million/m (dependent upon Mach number)