The ONERA S1MA windtunnel has been in commercial operation forthe last 55years. The drive system, in particularthe fan blades were becominga maintenance nightmare which had tobe addressed.
A briefdescription ofthe ONERA F4 hot-shot facilityis given, together with details ofits operation. The manyco-operative programmes that the F4 wind tunnel has been involved in are outlined.
An extensive acoustic wind tunnel test campaign was conducted between March and September 2003 in the frame of the European research project ROSAS to assess experimentally the noise shielding effec
