Abstract: A coolable airfoil 10 for rotary machines is disclosed. The airfoil has a passage 54 extending spanwisely through the leading edge region 26 of the blade. The first passage has a plurality of trip strips 66s, 66p canted toward the approaching flow and angled with respect to the wall in the leading edge region to turbulently increase the amount of cooling flowed to the forward most portion of the passage in the leading edge region. In one embodiment, a hole 72 in fluid communication with a turning passage 64 in the tip region of the blade downstream of the first passage is in fluid communication with the trailing edge of the blade.

Abstract: A feather seal construction that interlocks a pair of feather seal elements that fit into intersecting slots. Each interlocking element is restrained axially but permits relative limited rotary motion. One of the elements is recessed with diametrically opposed slots forming an "H" shaped member and the other is apertured at one end which is then slotted, bent to allow it to fit into the diametrical slots and then joined in the original position. An extruding end adjacent one face of the interlocking element seals in an axial direction giving both radial and axial sealing characteristics.

Abstract: A feather seal construction that interlocks a pair of feather seal elements that fit into intersecting slots. Each interlocking element is restrained axially but permits relative limited rotary motion. One of the elements is recessed with diametrically opposed slots forming an "H" shaped member and the other is apertured at one end which is then slotted, bent to allow it to fit into the diametrical slots and then joined in the original position. An extruding end adjacent one face of the interlocking element seals in an axial direction giving both radial and axial sealing characteristics.

Abstract: Apparatus for dampening rotor blade vibratory energy in a rotary machine is disclosed. Concepts employing blade to blade damping are discussed.In one detailed form, a damper (52) is disposed to seat against the undersides of adjacent blade platform sections (20) and a seal (42) is spaced sufficiently close to the damper so as to be deflected against the damper under centrifugal loads to augment dampening of the rotor blades by the damper.