Abstract: A method to reset an electromechanical disconnect is provided. The method includes electrically disengaging a pawl holding a first half of a dog clutch, located between a starter-generator and a main engine gear box, in a disengaged position, controllably energizing the starter-generator to produce a selected angle of rotational motion of a starter-generator shaft, wherein the selected angle is equal to 360 degrees divided by a number of teeth on the first half of the dog clutch, and determining when the first half of the dog clutch is engaged with a second half of the dog clutch.

Abstract: A method for manufacturing a rotor shaft is provided. A rod is formed from a metal matrix composite material, the rod having an outer diameter. The rod is heated to attain a stiffness thereof that is greater than about 300 GPa. A machinable sleeve is formed from material having a stiffness that is less than the stiffness of the rod and that is different than the material of the rod, the sleeve having an inner diameter that is equal to or less than the rod outer diameter. The rod is inserted into the sleeve, after the rod is heated.

Abstract: A rotor for use in a high speed electrical machine includes a shaft, a plurality of poles, a plurality of coils, and a rotor crossover that is relatively flexible, and that does not crack under the centrifugal forces and the mechanical and thermal cycles encountered during machine operation, startup, and shutdown. The poles extend radially outwardly from the shaft and are spaced apart from each other to form an interpole region, and the coils are wrapped around the poles. The rotor crossover is coupled between selected ones of the coils, and includes a stranded wire conductor and an insulator.

Abstract: An outflow valve includes a valve closure mechanism that automatically closes the outflow valve in the unlikely event the outflow valve actuator becomes inoperable. The valve closure mechanism includes a pulley, a load plate, a cable, and a spring. The pulley is coupled to a valve element is the outflow valve and is configured to eccentrically rotate therewith. The cable has a first end coupled to the pulley, and a second end coupled to the load plate. The spring is disposed between the valve and the load plate and surrounds a portion of the cable. The spring is configured to supply a bias force, via the load plate and the cable, to the pulley that biases the valve element toward the closed position.