The project involves the design, model development, and control of solar-powered small-scale remote-controlled helicopter systems/air vehicles with potential civilian applications, such as law enforcement and traffic management. Appropriate modelling and control methodologies need to be investigated to address the nonlinearity of the system. Possible control techniques to be adopted include fuzzy logic-based control and nonlinear model predictive control. We have already developed a solar quadrotor dubbed 'solarcopter' to fly with solar energy.