The objective of this project is to experimentally investigate the interaction of the RDC with the transition duct. This region is important for the preparation of the flow before entering the turbine. Therefore, the experimental aspects of this work will explore three main objectives: (i) develop and test a candidate film cooling liner in conjunction with DC09, (ii) test the integration of a transition duct in conjunction with the projects of WP4, and (iii) test an ejector geometry in conjunction with DC07 and DC08. The specific geometries will be decided in discussion with the relevant partners. The testing procedure common to these three objectives is to investigate the effect of the transition duct on the state of the gas at the end of the duct as well as to investigate the impact of the duct upstream on the detonation wave. The project will utilize high frequency pressure measurements, total pressure measurements, direct imaging, and PIV and schlieren imaging where appropriate to quantify the reduction in fluctuation intensity through this region while also considering the losses. In addition to exploring the flow field in the transition duct and the dependency of the interaction of this region on the detonation wave, the project will also provide experimental data for validation of the corresponding numerical studies.