sentences:  Modern jet engines such as the Rolls Royce Trent 900 and the Engine Alliance GP7000, which both power the Airbus A380, are examples of wide-chord fan engines.The geometry of a jet engine blade is essentially that of an airfoil and as such, there is no single optimum design.As with most mechanical components, the blade is a compromise in trying to achieve as large a blade area as possible within the practical constraints