Abstract
This paper presents the optimal model for model based control of small-scale unmanned helicopter. We designed a multi-input/multi-output model of small-scale helicopter which refer Mettler's model, and we identified this model by frequency domain identification. Frequency domain and time domain validation results have shown that identified model can describe actual dynamics of helicopter, and we derive simple SISO model based on this MIMO model, so we prove experimentally that this SISO model is optimal model for model based control of small-scale unmanned helicopter.