Abstract: A tapered-transparent acrylic plate has advertising or the like applied to front or back surfaces. The thick end of the plate has openings to receive illumination sources. Incandescent sub-miniature lamps are mounted to a circuit board and are closely coupled to the openings in the plate. The lamps and tapered plate provide uniform illumination of the advertising. The tapered plate and circuit board are retained in a plastic channel which is secured to a base. The channel has ventilation means for the cool operation of the display. The display is powered by a remote transformer which operates the lamps at a level below the design voltage of the lamps. Operating lifetime is significantly increased.

Abstract: An improvement made to jet-engine thrust reversers and, more particularly, to reversers called tilting-door reversers. The doors are equipped, on their upstream portion, with a flow-deflecting overlay 90 which, in the open-door position, is in a position close to a line PM parallel to the axis of the engine 1, the overlay making with the inner door skin an angle B greater than 90.degree., preferably between 105.degree. and 110.degree.. The invention is more particularly applicable to dual-flow engines.

Abstract: A gas turbine is provided in which heat is removed from compressed air bled from the compressor section, for purposes of cooling in the turbine section, using a first heat exchanger to transfer heat from the cooling air to an intermediate fluid. The heat so removed is then returned to the cycle by transferring it from the intermediate fluid to a fluid to be injected into the combustion section, such as gaseous fuel or water for NOx control, using a second heat exchanger. A third heat exchanger may be used in conjunction with the second heat exchanger to control the temperature of the intermediate fluid and, hence, the temperature of the cooling air.

Abstract: An air liquefier and separator of air constituents for a liquid air engine. Its unique structure captures the ambient air and guides it through guide vanes into a bank of spiral tubes or channels where the air is completely contained while being liquified and separated into its constituents. The spiral tubes or channels provide a compact heat exchanger design with long tube length or channel length for efficient heat transfer and liquefying of the air which is accomplished by a flow of liquid hydrogen flowing either inside a concentric tube inside the air condensing tube or flowing in a tube or channel with a common wall in contact with the air condensing tube or channel. The liquefier can easily be designed to be an integral part of a liquid air jet engine installation.

Abstract: A combined turborocket and ramjet propulsion unit comprises an air intake duct, and an air compressor with two counter-rotating rotor stages disposed downstream of the duct in an annular path formed between an outer casing and a central body which is maintained in position relative to the casing by structural arms. The rotor stages of the compressor are driven by a power turbine driven by combustion gases from a gas generator which burns liquid propellants. The power turbine includes two interleaved counter-rotating modules arraanged within the central body in a position longitudinally between the two compressor stages which they drive, and the gas generator is disposed axially within the central body to the rear of the turbine modules, the generator supplying the combustion gases to the turbine in an upstream direction through a central ejection chamber and an annular reversing chamber which redirects the gases rearwards through the turbine.