Airfoil rotor hub system having intentional frequency mistuning

A turbine engine comprising:

• an airfoil rotor hub system comprising:
• a rotor hub having a variable radius around a circumference of the rotor hub such that a surface of the rotor hub has a variable shape around the circumference of the rotor hub, the rotor hub being a single structure;
• and
• a plurality of airfoils connected to the rotor hub, a first airfoil in the plurality of airfoils having a first base connected to the surface of the rotor hub and a first tip extending therefrom by a first span, the first base of the first airfoil is connected to the surface of the rotor hub at a first radius, and a second airfoil in the plurality of airfoils having a second base connected to the surface of the rotor hub and a second tip extending therefrom by a second span, the second base of the second air foil is connected to the surface of the rotor hub at a second radius,
• wherein the first radius is different from the second radius, and the first span of the first airfoil is different from the second span of the second airfoil so as to mistune a frequency of the first airfoil and the second airfoil to reduce or substantially eliminate flutter in the plurality of airfoils.