Abstract: A flexible duct for fluidly communicating between first and second components includes a first duct section with an intake end and an exhaust end. A first joint pivotally couples the intake end to the first component for pivotal movement about a first axis. The flexible duct also includes a second duct section with a first end and a second end. The first end is pivotally coupled to the exhaust end by a second joint, and a third joint pivotally couples the second end to the second component. The second joint is pivotable about a second axis that is generally parallel to the first axis, and the third joint is pivotable about a third axis that is generally perpendicular to the first and second axes.

Abstract: An inter-rotor bearing assembly includes a first annular member having a circumferential inner surface and a second annular member having a circumferential outer surface. The outer surface is concentric to and disposed radially inward of the inner surface and a bearing is disposed between the surfaces. The bearing has an outer race fixedly attached to the first annular member along the inner surface, an inner race fixedly attached to the second annular member along the outer surface, and rolling elements disposed between the races. A low density high circumferential strength support ring is fixedly attached to the first annular member disposed concentrically outside of the inner race and is preferably made of a titanium matrix composite. The rolling elements may be cylindrical rollers having cylindrical rolling surfaces. The support ring may be fixedly attached around or integral with the first annular member.