Vibrations play a crucial role in the design of helicopter structures where, in many cases, due to the complexity of the systems, dynamic interactions and excitations can only be determined in flight tests causing structural changes in the late development phase. Often, especially for unconventional designs for which practical experience is limited, such as eVTOLS, structural dynamic simulations can only make inaccurate predictions. Therefore, one possible solution to minimize the risk in design is being conservative increasing the global damping of the helicopter structure, for which natural fibers offer a promising approach. The project consists on the hybridization with carbon-flax fibers of helicopter parts.