This thesis aims to describe the development of a flight simulation model for a multi-purpose helicopter. The model is developed in the Matlab/Simulink environment and also has the target to be integrated into a real-time flight simulator such as the ReDSim of the ZAV Centre for Aviation at ZHAW, Zurich University of Applied Sciences, in Winterthur, Switzerland, a research and development flight simulator employed for both educational and industrial applications. The study mainly focuses on developing a model for the helicopter tail rotor with its shrouded configuration. Nevertheless, a model for the aerodynamic surfaces and the main rotor wake has also been developed.