ODIN will raise the level of understanding of the behaviour of novel close-coupled 3D UHBR engines at off-design conditions from TRL 2, where the basic concepts are understood and demonstrated, to TRL 4, where the details of the precise flow physics have been experimentally validated in laboratory settings, alongside high-fidelity PART B. I of the Partner(s) Application/Proposal for IA/RIA/CSA (Technical Section) – ODIN 9 computations (Figure 1). This will be achieved through a targeted programme of work focusing on external cowl separations, engine nozzle suppression, jet-noise interaction and overall installed nacelle geometries, all through a range of complex and challenging flight regimes. Crucially, ODIN results will also feed directly in to the planning of the Rolls-Royce UltraFan® Flight Test Demonstrator at TRL 6. One key output of WP5 is the sensor location to be used on the FTD for assessing aircraft noise levels; and the results of WPs 2, 3 & 4 will inform the FTD mission expectations and aircraft performance calculations.