Cmc airfoil with wishbone shaped fiber layup structure forming portion of platform and root

An airfoil comprising:

• a ceramic matrix composite (CMC) airfoil wall defining a platform, a root extending radially from the platform, and an airfoil section extending radially from the platform opposite the root, the CMC airfoil wall including first and second wishbone-shaped fiber layup structures,
• each of the first and second wishbone-shaped fiber layup structures including:
• first and second arms that merge into a single leg,
• the first and second arms being comprised of a network of fiber tows,
• the single leg including fiber tows from each of the first and second arms that are interwoven in the single leg, the single leg forming a portion of the root, and
• the first and second arms extending in opposite directions from the single leg and forming a portion of the platform, wherein
• the first arm of the first wishbone-shaped fiber layup structure extending axially forwardly from the single leg of the first wishbone-shaped fiber layup structure, and the first arm of the second wishbone-shaped fiber layup structure extends axially aftly from the single leg of the second wishbone-shaped fiber layup structure,
• the second arm of the first wishbone-shaped fiber layup structure extends axially aftly from the single leg of the first wishbone-shaped fiber layup structure, and the second arm of the second wishbone-shaped fiber layup structure extends axially forwardly from the single leg of the second wishbone-shaped fiber layup structure, and
• a tip of the second arm of the first wishbone-shaped fiber layup structure is adjacent a tip of the second arm of the second wishbone-shaped fiber layup structure to define a gap therebetween.

A gas turbine engine comprising:

• a compressor section;
• a combustor in fluid communication with the compressor section;
• and
• a turbine section in fluid communication with the combustor, the turbine section having an airfoil including:
• a ceramic matrix composite (CMC) airfoil wall defining a platform, a root extending radially from the platform, and an airfoil section extending radially from the platform opposite the root, the root having a fir-tree profile, the CMC airfoil wall including first and second wishbone-shaped fiber layup structures,
• each of the first and second wishbone-shaped fiber layup structures including:
• first and second arms that merge into a single leg,
• the first and second arms being comprised of a network of fiber tows,
• the single leg including fiber tows from each of the first and second arms that are interwoven in the single leg, the single leg forming a portion of the root, and
• the first and second arms extending in opposite directions from the single leg and forming a portion of the platform, the first arm of the first wishbone-shaped fiber layup structure extending axially forwardly from the single leg of the first wishbone-shaped fiber layup structure, the first arm of the second wishbone-shaped fiber layup structure extending axially aftly from the single leg of the second wishbone-shaped fiber layup structure, the second arm of the first wishbone-shaped fiber layup structure extending axially aftly from the single leg of the first wishbone-shaped fiber layup structure, and the second arm of the second wishbone-shaped fiber layup structure extending axially forwardly from the single leg of the second wishbone-shaped fiber layup structure, and a tip of the second arm of the first wishbone-shaped fiber layup structure is adjacent a tip of the second arm of the second wishbone-shaped fiber layup structure to define a gap therebetween.