The axisymmetric flow field around a ducted rotor is thoroughly analysed by means of a nonlinear and semi-analytical model which\nis able to deal with some crucial aspects of shrouded systems like the interaction between the rotor and the duct, and the slipstream\ncontraction and rotation. Not disregarding the more advanced CFD based methods, the proposed procedure is characterised by\na very low computational cost that makes it very appealing as analysis tool in the preliminary steps of a design procedure of\nhierarchical type. The work focuses on the analysis of the effects of the camber and thickness of the duct cross section onto the\nperformance of the device. It has been found that an augmentation of both camber and thickness of the duct leads to an increase\nof the propulsive ideal efficiency
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