Turbine engine with composite airfoils

A turbine engine comprising:

• a fan;
• and
• a turbomachine defining an engine centerline and comprising a compressor section, a combustion section, and a turbine section in serial flow order;
• a composite fan casing surrounding the fan in a circumferential direction about the engine centerline and comprising at least one integral composite flange extending radially outward from a surface of the composite fan casing and at least partially extending in the circumferential direction;
• the fan comprising a set of composite airfoils circumferentially arranged about the engine centerline, an airfoil of the set of composite airfoils comprising:
• a composite body extending chordwise between a body leading edge and a body trailing edge;
• and
• a leading edge protector having a protector leading edge different from, and receiving at least a portion of, the body leading edge,
• wherein a leading length (LL) extends chordwise from the protector leading edge to an end of the leading edge protector, and a chord length (CL) extends chordwise from the protector leading edge to the body trailing edge;
• and
• wherein the LL is related to the CL by an airfoil protection factor
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• and the APF is greater than or equal to 0.1 and less than or equal to 0.3 (0.1≤APF≤0.3).