Hollow fan blade for gas turbine engine

A hollow fan blade comprising:

• a first substrate having a root edge and an opposite tip spaced radially outward from the root edge, the substrate further including a leading edge opposite a trailing edge, the leading edge spaced chordwise from the trailing edge;
• and
• a second substrate;
• and
• a plurality of curved cavities between the first and second substrates, each of the plurality of curved cavities terminating in a first closed end adjacent the leading edge and terminating in a second closed end adjacent the trailing edge.

A hollow fan blade comprising:

• a first substrate having a root edge and an opposite tip spaced radially outward from the root edge, the substrate further including a leading edge opposite a trailing edge, the leading edge spaced chordwise from the trailing edge;
• and
• a second substrate;
• and
• a plurality of curved cavities between the first and second substrates, each of the plurality of curved cavities terminating in a first closed end adjacent at least one of the root edge, the tip, the leading edge and the trailing edge, a plurality of curved ribs defined between the plurality of curved cavities, wherein the plurality of ribs extend substantially parallel and substantially radially in a region adjacent the root edge, wherein the plurality of ribs includes a first subset and a second subset of ribs, wherein the first subset of ribs curves toward the leading edge and wherein the second subset of ribs curves toward the trailing edge.

A gas turbine engine comprising:

• a compressor compressing air;
• a combustion section combusting fuel with the compressed air from the compressor;
• a turbine including a plurality of turbine blades rotatably driven by the combustion of the fuel in the combustion section;
• and
• a fan including a plurality of fan blades, the fan and the compressor rotatably driven by the turbine, wherein each of the plurality of fan blades includes a detail half including a substrate having a root edge and an opposite tip spaced radially outward from the root edge, the substrate further including a leading edge opposite a trailing edge, the leading edge spaced chordwise from the trailing edge, each detail half further including a plurality of curved ribs formed on the substrate.