Fan platform with stiffening feature

A method of making a fan blade platform, comprising:

• laying up a first layer and a second layer on a first mandrel to form a first lobe;
• laying up a third layer and a fourth layer on a second mandrel to form a second lobe;
• wrapping a fifth layer around the first lobe, the second lobe, and;
• a first circular member and a second circular member;
• wherein the first lobe contacts the second lobe;
• and
• molding the first lobe, the second lobe, the first and second circular members, and the fifth layer integrally;
• wherein the first lobe, the second lobe, and the fifth layer form structures of the fan blade platform comprising:
• an outer wall, a first sidewall extending from the outer wall to the first circular member and to the second circular member spaced from the first circular member;
• and
• a second sidewall extending from the outer wall to the first circular member and to the second circular member;
• and
• a stiffening member extending from the first circular member and the second circular member to the outer wall, the stiffening member formed integrally with the first circular member, the second circular member, and the outer wall;
• wherein the stiffening member comprises:
• a first arm and a second arm extending from the first circular member toward the outer wall, the first and second arms defining a first opening in the stiffening member,
• a third arm and a fourth arm extending from the second circular member toward the outer wall, the third and fourth arms defining a second opening in the stiffening member and
• a third opening disposed between the first and second arms and the third and fourth arms, the third opening extending axially between the first circular member and the second circular member.