A starter is provided including a housing defining a fluid passageway with an inlet and an outlet. A turbine rotor is supported in the housing and includes blades arranged in the passageway between the inlet and the outlet. The rotor is movable within the passageway at a speed with a fluid exiting the blade toward the outlet. A spoiler is arranged in the passageway between the rotor and the outlet. The spoiler deflects the fluid exiting the blade and reduces the rotor speed. Preferably, the pres...

A magnesium methylate coating useful for insulating electromechanical hardware that comprises a composition of magnesium methylate, methyl alcohol, silica and talc.

A transmission for coupling a variable speed engine to a dynamoelectric machine that has three hydraulic units coupled to a mechanical summer, wherein two of the hydraulic units are varied in displacement to control the speed of the third in order to keep the speed of the dynamoelectric machine constant regardless of engine speed.

A water electrolysis system includes a water electrolysis cell stack having an anode and a cathode. A water storage tank having an outlet is disposed above the cell stack and communicates with an inlet of one of the anode and the cathode of the cell stack for gravity feeding water from the water storage tank to the cell stack. A phase separator is disposed below and in communication with the water storage tank. The phase separator has an inlet for receiving a two phase stream including water and...

Maintenance requirements on a variable pitch propeller control system are minimized by eliminating the need for mechanical elements, such as a flyweight, mechanism in a secondary control for the variable pitch propeller. The system includes a secondary control (40) operating a pitch change mechanism (24) in response to the existence of at least one undesirable propeller condition and includes a target (34), (38) along with a target pickup (32), (36) for sensing the target (34), (38) and providin...

A control for operating an inverter coupled to a switched reluctance machine is responsive to the magnitudes of current flowing in the phase windings of the machines and controls switches in legs of the inverter based upon such magnitude.

Fretting problems between clamped parts as, for example, flanges and aircraft power trains, is substantially eliminated through the use of a shim placed between the clamped flanges and which is rich in polytetrafluoroethylene at its surfaces abutting the flanges and includes an interior matrix of a strength giving fiber such as glass fiber.

A self-actuating thermal disconnect disengages two coaxially aligned shafts if equipment driven by one of the shafts overheats. The disconnect uses the centrifugal force of a molten material as the principal actuation. The disconnect end of a drive shaft has a means for transmitting torque. A disconnect piston having first and second ends is axially movable in a splined cylinder within the driven shaft. In normal operation, a solid mass of fusible material is disposed in the disconnect piston wi...

A thermal management system avoids problems associated with the recirculation of fuel through a fuel tank on an aircraft in a system that includes a fuel reservoir (70), a pump (72) for pumping fuel from the reservoir (70) to a first heat load (74) and then to a check valve (76) to a junction (78). At least one second heat load (80), (82), (84) is connected to the junction (78) and a fuel/fan air heat exchanger (104) having a fan air flow path in heat exchange relation with a fuel flow path havi...

Methods and apparatus are disclosed for providing shutoff, overspeed protection, and directional control of a bypass flow in a fuel delivery system (10) for a combustion engine, such as a gas turbine engine. A valve pack (72) is integrated into a fuel metering unit (12) and provides shutoff and overspeed protection, including verification of the operational integrity of the shutoff and overspeed protection components. A bypass directional control valve (150) is integrated into one embodiment of ...