A ducted fan gas turbine engine comprises a pair of turbines in flow series which are contra-rotating and which drive shafts which in turn drive into an epicyclic gear. The output from the epicyclic gear drives a fan which normally provides forward thrust from the engine. The fan can be made to rotate in the opposite direction to provide reverse thrust by varying the relative speeds of rotation of the two turbines by bleeding working fluid from between them.

Differentially geared reversible fan for ducted fan gas turbine engines

A propfan turbine engine having a reduction gearing for the propfan rotors is provided with a lubricating system of its own for the reduction gearing, the system being arranged axially between the gas turbine and the reduction gearing and formed as an annular assembly surrounding a drive shaft from a gas turbine to the reduction gearing. Cooling air is supplied to the lubricating system as a location which will not interfere with the supply of air to the compressor of the gas turbine.

Propfan turbine engine

A wind turbine generator including a nacelle having reduced size and weight is provided. The wind turbine generator includes a nacelle disposed on a tower. The nacelle includes a main shaft that is connected to a rotor head equipped with blades and that integrally rotates with the rotor head, a gearbox that increases the rotational speed of the main shaft and that outputs the resulting rotational speed, and a generator driven by the output from the gearbox. In the wind turbine generator, a drivetrain extending from the main shaft to the generator via the gearbox is disposed in the rotor head.

Wind turbine generator

A reheat gas and double reheat steam turbine combined cycle is provided in which the outer shell confining the blading of the power turbine and the exhaust portion of the power turbine are cooled with steam extracted from the steam cycle. The coolant steam is extracted from a high pressure steam turbine, used to cool the turbine outer shell, readmitted for expansion in the steam turbine, the lower pressure steam is extracted to cool the exhaust portion of the power turbine and readmitted to the steam turbine and condensed.

Process for steam cooling a power turbine

Blade pitch of variable pitch blades is changed by an actuator having first and second ac machines. The first ac machine is excited with ac power to apply a motoring torque to a control shaft of the actuator, thereby causing blade pitch to change in one direction. The second ac machine is excited with appropriate power to apply a braking torque to the control shaft, thereby causing blade pitch to change in an opposite direction. When the second ac machine is an induction machine, dc excitation will brake the control shaft. When the second ac machine is a synchronous machine, an ac excitation causing a retarding magnetic field will brake the control shaft.

Electromechanical apparatus for varying blade of variable-pitch fan blades

It is known to use the exhaust from internal combustion engines for assisting the propulsion of aircraft by ejection and to operate superchargers and compressors by means of exhaust driven turbines. The present invention has for its object improved means for utilizing by the ejection method...

Periodically actuated jet motor

This invention relates to electrical equipment on aircraft, having self-contained electrical units for association with variable pitch propellers to provide means for varying the pitch of the propeller blades and to generate current for electrical de-icing devices for the blades and spinner

Electrical equipment on aircraft

This invention relates to jet propulsion of craft and more particularly, to a jet propulsion unit for aircraft and the like. This application is a continuation-in-part of my application Serial No. 515,013, filed December 20, 1943. Various types of power means for aircraft employing the jet...

Turbine type jet propulsion

Electrically driven propeller pitch change system

This invention relates to helicopters, the rotors of which are driven by internal combustion engines mounted at the outer ends of the rotor blades and has for its object improved means for carrying the high centrifugal loads which arise as a result of such a mounting. To this end and in accordance...

Forsyth Archibald Graham

Papers

Periodically actuated jet motor

Electrical equipment on aircraft

Turbine type jet propulsion

Electrically driven propeller pitch change system

Power plant for helicopters