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The influence of a propeller on the aerodynamic performance of an MAV is investigated using an unstructured
overset grid technique. The flow regime of a fixed-wing MAV powered by a propeller contains both incompressible
regions due to the low flight speed, as well as compressible flow areas near the propeller-tip region. In order to simulate
all speed flow efficiently, a dual-time preconditioning method is employed in the present study. The methodology in this
paper is verified as providing a reliable numerical simulation tool for all flow regimes, in the additional presence of
moving boundaries, which is treated with an overset grid approach.