(57) A rotor blade (14) is provided having a hollow airfoil (22) and a root (20). The
hollow airfoil (22) has a cavity defined by a suction side wall (38), a pressure side
wall (36), a leading edge (32), a trailing edge (34), a base (28), and a tip (30).
An internal passage configuration (40) is disposed within the cavity. The configuration
includes a first radial passage (48), a second radial passage (50), and a rib (53)
disposed between and separating the first radial passage (48) and second radial passage
(50). A plurality of crossover apertures (52) are disposed within the rib (53). A
portion of the plurality of crossover apertures (52) are oblong having a length (70)
extending through the rib (53), and a height (74) and a width (72). The height (74)
of each oblong aperture (52) is greater than the width (72). In some embodiments,
the oblong crossover apertures (52) are aligned heightwise along the rib (53). The
root (20) includes a conduit (42) that is operable to permit airflow through the root
(20) and into the first radial passage (48).
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