Airfoil having a spline fillet

An airfoil for a gas turbine engine, comprising:

• an airfoil body extending in a spanwise direction from an inner end to an outer end and extending in a chordwise direction from a leading edge to a trailing edge, the airfoil body having a pressure side and an opposed suction side;
• a platform located at the inner end and/or the outer end of the airfoil body, the platform extending transversally to the airfoil body;
• and
• a fillet at a junction between the airfoil body and the platform, the fillet having a radius distribution at a given chordwise location, the radius distribution of the fillet varying from the platform to the airfoil body in the spanwise direction, the radius distribution defining
• a local minimum, the radius of the fillet at the given chordwise location increasing from the local minimum along the spanwise direction toward both of the airfoil and the platform, and
• a local maximum offset from the local minimum along the spanwise direction, the radius decreasing from the local maximum along the spanwise direction toward both of the airfoil and the platform.