Have you noticed that they have a curved shape?

With the development of aircraft engines, power units increase in size, and along with them, the shape of the fan blades changes. From flat plates, they have evolved over time into three-dimensional curved shapes.

Striving for increased efficiency, developers improved the aerodynamics of the blades and reduced their number: new engines have fewer blades than previous models. For example, the outer contour of the GE90 engine on the Boeing 777-300ER consists of 22 curved blades, while the earlier RR Trent 892 model on the Boeing 777-300 has 26. And the PD-14 engine of the domestic MC-21 airliner has 18 blades ✈️