D5. 5: Report on test data for single-curvature deformable specimen

In this report the data of the high-speed ditching tests performed at the CNR-INM (Institute of Marine Engineering) former CNR-INSEAN, on single curvature, deformable specimens are presented. The report provides details on the specimen shapes and internal structure, the design and the instrumentation. The specimen designed was agreed with Airbus Defence and Space and mimics the internal structure of the aircraft. A total of four specimen were built and tested, two of them with a skin of uniform thickness of 1.6 mm and two with the skin thickness reduced by milling to 1.2 mm in the empty spaces between stringers and frames. The specimens with skin of uniform thickness were tested at 6 degrees pitch, V/U=0.0333, at a horizontal velocity U?48 m/s displaying a satisfactory repeatability of the data. Hence, the first specimen with the milled skin was tested still at 6 degrees pitch whereas the second specimen was tested at 10 degrees. In the latter case a large crack occurred on the skin soon after the impact and the large water ingress broke the cables and only a limited number of channel data is available. The purpose of the high-speed ditching tests on the single curvature deformable specimens is to provide a quite realistic dataset which can be used for the validation and development of the computational methods and to assess their ability to reproduce the correct fluid-structure interaction phenomena during ditching.