A hexacopter aircraft is a class of helicopter, more specifically of multirotors. The hexacopter has several characteristics (mechanically simple, vertical takeoff and landing, hovering capacities, agile) that give it several operational advantages over other types of aircraft. But its beneficts come at a cost: the hexacopter has a highly nonlinear dynamics, coupled and underactuated which makes it impossible to operate without a feedback controller action.
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Moussid et al. (2015) studied this question.
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