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The objective of this project was to validate a flight dynamics model for the K100 UAV. This objective was achieved by determining the major aerodynamic coefficients of the K100 UAV and producing hardware for collecting flight data. The wind tunnel testing was performed in a low speed wind tunnel using the K70 so accuracy was slightly compromised. However, the results were sufficient to show that for the unusually shaped K100 UAV, the aerodynamics coefficients determined by software packages (Datcom and Tornado) do not accurately represent the actual values. The experimental drag coefficients are higher than those predicted by the software model and this has a large affect on the accuracy of the flight dynamic model. The sensor hardware developed during this project worked well during flight tests and allowed the collection of flight data which were used to assess the accuracy of the flight dynamics model. These sensors may be useful in other applications, such as aids for UAV navigation. The sources of instrumentation error were identified. The serious vibration generated by the K100 engines caused false AOA readings, particularly at low speeds. This could be overcome by improving the probe mounting location and method or using an electrically powered UAV. The validation of the current software FDM has shown that it has two main limitations. It is unable to use some of the experimental aerodynamics coefficients because they produced unstable flight response. It was also unable to use the collected wind data because rapid changes caused the FDM to crash. Resolving these problems would improve the FDM, which otherwise represents the UAV flight reasonably well. The aims of the model validation were met and a complete validation process for a flight dynamics model was presented. The current FDM has been assessed using this method and possible sources of inaccuracies identified. The presented validation process based on inflight test and onboard instrumentation makes a significant step towards completing an accurate flight simulation system for auto-pilot development and design verification of UAVs.