10. Conclusion

The design and development of a propeller is a complex activity, involving a large number of complementary disciplines. The choice of an architecture or functional concept is always the fruit of reflection aimed at satisfying a multitude of often contradictory imperatives. This is where the helicier's expertise comes into play, as he is able to propose the optimum solution (figure 45 , p. 26).

Moreover, technological developments over the last few years have shown that we are increasingly moving towards integrated systems that consider the overall optimization of the entire propulsion system (engine + propeller); already, the conceptual difference between a very high bypass ratio turbofan engine on the one hand, and a turboprop engine on the other, is diminishing....