Abstract: A process for obtaining a substantially pure enantiomer of an aryl-substituted aliphatic carboxylic acid is described. The process combines an aryl substituted aliphatic carboxylic acid, a base and water in an inert solvent to make a hydrated salt of the said acid. The process leads to enhanced yield of an enantiomerically enriched hydrated salt of the carboxylic acid.

Abstract: A secondary oil system for a flight propulsion gas turbine engine becomes operative only when engine fuel pressure is normal and engine primary oil pressure is abnormally low. The secondary oil system includes an air circuit having a mist circuit portion, a pilot operated air valve which normally blocks the air circuit, and a pilot valve responsive to fuel pressure and primary oil pressure to actuate the air valve. When the air circuit is unblocked, air flow in the mist circuit portion aspirates oil from a reservoir tank which oil is dispersed as a mist directed at a bearing in the sump.

Abstract: An end seal for root manifolds at the bases of air cooled turbine blades disposed in retention slots in a turbine wheel; the end seal including an annular groove in the upstream face of the wheel having an outboard cylindrical edge outboard of the root manifold, an inboard cylindrical edge inboard of the retention slots and a slot face parallel to the upstream face of the wheel; an imperforate seal ring in the annular groove with a right circular flange adjacent the outboard edge, an annular foot engaging the groove slot face inboard of the retention slots, and a body portion defining an accordion fold in transverse cross section; and seal plate segments on the wheel over the groove.

Abstract: An end seal for cooling air manifolds below the bases of a stage of air cooled turbine blades on a turbine wheel, the end seal including a seal ring having an annular planar portion abutting an end face of the turbine wheel inboard of the air manifolds and a right cylindrical flange perpendicular to the planar portion and underlying a corresponding cylindrical shoulder on the wheel and on the blade bases outboard of the air manifolds, and a plurality of end plates on the wheel having lugs underlying the cylindrical flange. The planar portion is axially clamped to the wheel to define a 360.degree. inboard seal while centrifugal forces developed by the end plates during rotation of the wheel cause the lugs to radially clamp the cylindrical flange against the cylindrical shoulder on the wheel and blade bases to define a 360.degree. outboard seal.

Abstract: A gas turbine engine having variable geometry flow controllers therein for controlling mass flow in accordance with engine operation includes a rotor with a wide variation in thrust forces thereon during different phases of engine operation countered by a variable axial load integrating device having a rotating hydraulic thrust compensating piston mounted forwardly of the rotor in association with a rotor thrust bearing and further including means for generating a centrifugal head in accordance with engine speed by means of rotating oil trapped between the rotating piston and a nonrotating counter piston; depth of rotating oil is automatically regulated by an integral, flow regulator having flow area therethrough varied in accordance with axial position of a thrust bearing carriage that has the variable rotor thrust loading imposed thereon.