The application of modern unmanned helicopters in the agricultural sector has been more effective than traditional agriculture. However, the helicopter design process still faces many difficulties. Designing unmanned helicopter rotor blades requires considering complex aeroelasticity phenomena. Aeroelasticity phenomena arise when structural deformations cause changes in aerodynamic forces because the aircraft structure is not completely rigid. Fluid–Structure Interaction computational models are excellent tools for studying this phenomenon. This computational model allows for the calculation of interactions that occur when additional aerodynamic forces act on the airfoil. These interactions cause increasing structural deformation, which can gradually decrease until equilibrium is reached, or increase to the point of destruction when resonance occurs. The paper uses the FSI calculation method in Ansys software. The calculation process presented in this paper is a complete process, including design, calculation, error analysis, and analysis of achieved results. These results were confirmed to match actual aircraft models and were used to improve future designs. Using these analyzes before manufacturing the actual airfoil will greatly reduce the cost and time of testing.