Patent ID: 9657577
Date: 2017-05-23
CPC Classifications: B23P,B64C,F01D,F04D,F05D,Y02T

Claim:
1. An airfoil comprising: an airfoil body comprising: an outer cover extending over the first internal cavity, the first rib, and the second internal cavity; and an inner cover bonded to the outer cover and the body, the inner cover comprising a first coupling element extending along the first internal cavity in cooperative engagement with the first rib; wherein the inner cover extends into the first internal cavity and away from the outer cover in a first portion; wherein the inner cover extends over the first rib and adjacent to the outer cover in a second portion; and wherein the inner cover extends into the second internal cavity and away from the outer cover in a third portion; and wherein the inner cover further comprises a corrugated stiffener spaced from the first rib along the first internal cavity.