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The German-Dutch Wind Tunnel DNW, a joint venture of NLR and its German sister organization DLR, is the most sophisticated installation in Europe for aerodynamic and aeroacoustic research in the low-speed regime. The independent Foundation DNW, in which NLR and DLR equally participate, is responsible for the operation, maintenance and further development of this large low-speed wind tunnel (interchangeable test sections of up to 9,5 m x 9,5 cross section). DNW is being used in several aircraft and helicopter development programmes, and for testing full-scale motor vehicles. Its capabilities for aeroacoustic testing are excellent, and are utilized extensively, in particular for helicopter noise studies.