| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce shearing stress caused by torsional deformation to improve strength by reducing torsional rigidity of a lead lag and feathering part of a flex beam, and to enhance safety and reliability of a flight control system for pitch change. <P>SOLUTION: In the flex beam 1 equipped with a flapping part 3 and the lead lag and feathering part 5, the lead lag and feathering part 5 is provided by integrally jointing a first composite material extending in the beam length direction and having a plurality of fiber orientations and a second composite material extending in the beam length direction and having the same fiber orientation as this extending direction. The cross section of the lead lag and feathering part 5 in the direction perpendicular to the beam length direction is shaped as two approximate Ys connected (approximate X shape). By arranging given concave parts on branch parts 40, 50 and bent parts 60, 70 of the lead lag and feathering part 5, the torsional rigidity is set to be low. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
