Showing papers on "Propulsion published in 1969"

V/stol aircraft

Abstract: A V/STOL aircraft comprises a fuselage having tandem wings which are offset lengthwise and vertically. Identical propulsion units are provided in each wing half. Each power unit comprises a pair of gas generators mounted respectively above and below the wing half and a pair of lift fans mounted within the wing structure on opposite sides of the engines. A valve system diverts the hot gas stream of the engines into a plenum chamber formed integrally with the wing structure. The hot gas streams are then directed from the plenum chamber to a tip turbine which powers the lift fans when vertical thrust is desired in operation of the aircraft. When forward speed of the aircraft is great enough for the aircraft wings to have sufficient lift, the hot gas streams are directed through propulsive nozzles providing a forward thrust component. In cruise, one engine of each power unit could be shut down. Each engine and each lift fan has emergency capacity which is automatically brought into play in the event of a failure of a lift fan or engine, with proper adjustments being made to the other power units to maintain balance and controlled operation of the aircraft in the lift mode.

Application of linear induction motors to high-speed transport systems

Abstract: The linear motor has been chosen as the method of propulsion for the full-scale prototypes of several high-speed transport systems currently being developed. The paper sets out the problems of the electrical design of such systems, showing its interdependence with the mechanical and thermal designs. Attention is then concentrated on the double-sided flat linear, motor with conducting-sheet secondary, which is thought to offer the greatest advantages for long tracks. Considerations of power supply, thrust and speed control and methods of braking are included. It is shown that a steel plate cannot be used as secondary conductor on economic grounds. The particular requirements of vehicles which are suspended on air cushions are considered throughout the paper and a concluding section discusses the possibility of using electromagnetic current collection for such vehicles.

Marine propeller and its mounting

Abstract: IT IS DISCLOSED FOR AN ENGINE DRIVEN OUTBOARD PROPULSION UNIT HAVING PASSAGE MEANS FR CONDUCTING THE EXHAUST GASES FROM THE ENGINE THROUGH SAID UNIT, A PROPELLER SEPARABLE FROM ITS SLIP CLUTCH ASSEMBLY MOUNTING WITH PROVISION IN THE PROPELLER AND/OR ITS MOUNTING FOR RECEIVING THE EXHAUST GASES FROM THE PROPULSION UNIT PASSAGE MEANS AND CONDUCTING SUCH GASES THROUGH THE PROPELLER HUB FOR DISCHARGE REARWARDLY OF THE PROPELLER AT LEAST DURING OPERATION OF THE PROPULSION UNIT IN THE FORWARD DIRECTION.

Outboard propulsion unit exhaust discharge system

Abstract: It is disclosed for an engine driven outboard propulsion unit having a reversible propeller to selectively drive the propulsion unit in forward and reverse directions and passage means for conducting the exhaust gases from the engine through said unit, a pair of underwater discharge openings for said propulsion unit and respectively disposed fore and aft of the propeller to provide for selective exhaust discharge into the outflow of the propeller slipstream regardless of the direction of propulsion unit operation and thereby assure a solid flow of water to the propeller in both forward and reverse directions of operation of the propulsion unit.

Turbo-fan propulsion apparatus and operating method

Abstract: Fan air of turbo-fan engine flows through ducts which pass through wall of lobed thrust nozzle mounted on aft end of the engine so as to receive exhaust gas discharged therefrom, the ducts terminating within the nozzle and being spaced apart circumferentially thereof. Assembly may include a tubular ejector movable from position around nozzle to position downstream therefrom and provided with thrust reversing doors, or a pair of thrust reversing doors movable from position adjacent aft end of housing which surrounds the engine to position downstream from the nozzle.

Underwater propulsion device

Abstract: An underwater propulsion device having a separate housing carrying a propulsion motor and a propeller adapted to be attached to a swimmer''s foot as by a shoe with power units, such as batteries or compressed gas carried by the swimmer and carrying a plurality of annular flotation rings around the periphery of the housing; the housing being hingedly attached to the swimmer''s shoe for allowing the swimmer to walk on the ocean bottom or other surfaces.

Toy vehicle propulsion unit

Abstract: A propulsion unit forming a propulsion station located along a closed-circuit trackway so that, when the propulsion unit has been cocked by the operator, a force will be applied to the toy vehicle to further propel it along the trackway as the toy vehicle traveling along the trackway passes through the propulsion station.

Propulsion nozzle with combined thrust reverser and sound suppressor mechanism

Abstract: A convergent-divergent nozzle for supersonic propulsion is shown. Flaps are pivotally mounted at the throat of the divergent, secondary nozzle and form a part of the secondary nozzle during normal supersonic propulsion. Spaced flaps, on opposite sides of the nozzle, are pivoted inwardly for sound suppression. All of the flaps are pivoted inwardly to block the hot gas stream and direct it forwardly and laterally through blow-in doors to provide reverse thrust. The flaps are controlled by a unique linkage system.

Hydraulic marine propulsion system

Abstract: A HYDRAULIC PROPULSION SYSTEM FEATURING AN INBOARD POWER PLANT AND FLUID PRESSURE-GENERATING SYSTEM AND AN OUTBOARD FLUID DRIVING SYSTEM, THE INBOARD PRESSURE-GENERATING SYSTEM CONSISTING OF REVERSIBLE VARIABLE DISPLACEMENT AXIAL PISTON PUMP, LEVER-OPERATED SERVOSYSTEM, SPEED CONTROL, CHARGE PUMP AND VALVE MANIFOLD UNITS AND THE OUTBOARD FLUID-DRIVING SYSTEM CONSISTING OF A FIXED DISPLACEMENT AXIAL PISTON FLUID MOTOR AND PROPELLER.

Guideway and switching linear motor propelled vehicle

Abstract: A vehicular transportation system including a guideway having lateral walls of ferromagnetic material and linear induction motors on the opposite sides of the vehicle to provide propulsion thrust and selective magnetic attraction to the walls. To negotiate a route fork, the motors on one side are deenergized so the vehicle follows the wall on the other side.

Propulsion systems for manned exploration of the solar system.

Abstract: Propulsion system performance relationship to manned planetary mission capability, discussing anticipated performance of advanced propulsion concepts

Water-jet propulsion

Abstract: An underwater jet propulsion nozzle includes means for injecting air into the jet stream issuing from the nozzle, to give increased thrust when stationary or at low speeds. The nozzle is mounted for swiveling movement on a fixed jet pipe, and the plane of the swivel joint is inclined downwards in the direction of forward motion.

Review and Preliminary Evaluation of Lifting Horizontal-Axis Rotating-Wing Aeronautical Systems (HARWAS)

Abstract: : Among the purely aeronautical applications, near-horizontal axis as well as horizontal axis devices are considered. The former cover the radial-lift propeller or 'self-propelling' wing; the latter cover Magnus effect and related systems; cyclogiro systems and horizontal-axis propeller systems with cyclic pitch. A limited investigation of non-aeronautical applications of HARWAS is also made, which covers wing-rotor type windmills, cyclogiro windmill turbines, Magnus effect ship propulsion and cycloidal ship propulsion. Approximately 1200 references are listed. A series of cross-index tables is also included to provide a quick means for the reader to determine the content and availability of the references. An analysis of the various lift systems pertinent to the HARWAS field is made with a view to potential air vehicle applications. Over 20 original aeronautical applications are identified and evaluated in the light of recent advances in power plants, transmissions and lightweight structural techniques. This analysis points out the extraordinary variety of HARWAS and identifies promising new aeronautical systems. A preliminary performance and design study of two promising HARWAS concepts is also reported. The two concepts are the STOL logistics aircraft using a rotating airfoil flap and the amplified high-pitch cyclogiro for application to the composite aircraft mission.

Method of supplying a propulsion device with fuel

Abstract: A propulsion system for a submarine includes an electric motor driving a propeller supplied with current from a fuel cell battery and a hydrocarbon burning engine. The fuel in the form of a hydroaromatic hydrocarbon or a mixture of such hydrocarbons is stored near the propulsion system. The hydroaromatic hydrocarbon is split to form hydrogen and the corresponding aromatic hydrocarbon. The hydrogen is supplied to the fuel cell and the hydroaromatic hydrocarbon is supplied as fuel to the other propulsion device.

Analytical prediction of thrust deduction for submersibles and surface ships

Abstract: An analytical method which is based on the Lagally steady-motion theorem is presented for the numerical calculation of thrust deduction for body and propeller systems. It is assumed that the influence of a propeller on a hull is mainly potential in origin, whereas the influence of the hull on the propeller is essentially viscous in origin. In the method, a lifting-line representation is used for the propeller, the potential flow due to the hull is obtained from the Douglas-Neumann program, and the real total wake is determined experimentally. Thrust deduction computations for a bare hull and an appended body of revolution, and a low-speed single-screw surface ship are in good agreement with the thrust deduction derived from propulsion tests of these vehicles. The results of a limited study of the effect on thrust deduction of propeller position and propeller radial thrust distribution are given.

Outboard motor isolation system

Abstract: Disclosed herein is a sound and vibration isolation mounting arrangement for an outboard motor having a marine propulsion unit mounted rearwardly of the steering axis of the outboard motor and including a power head, and a lower unit including a drive shaft housing and a gear case. The torque roll axis of the propulsion unit extends approximately vertically through the power head, drive shaft housing and lower unit gear case. The mounting arrangement includes an upper resilient mount connected to the top of the power head and a lower resilient mount positioned on each side of the lower end of the drive shaft housing. The upper and lower mounts have elastic axes which are coaxially arranged with respect to the torque roll axis of the propulsion unit.

Certification Tests of a Hybrid Propulsion System for the Sandpiper Target Missile.

Abstract: : An in-house exploratory development program was accomplished as part of an inter-laboratory team effort to demonstrate the feasibility of hybrid propulsion for the Sandpiper high-performance target missile The objectives of this program were to: (1) conduct off-design tests of a flight type (heavyweight) Hybrid thrust chamber assembly (TCA); (2) conduct flight certification tests on flight weight propulsion systems delivered under a concurrent AFRPL contract; and (3) provide propulsion system field servicing and engineering support during subsequent flight tests of the propulsion system Thirty heavyweight TCA tests were conducted, and TCA component operating characteristics, TCA component durability, effects of metal fuel grain additives on combustion, effects of fuel grain temperature on combustion, effects of IRFNA oxidizer substitution, and TCA altitude performance were evaluated MON- 25 oxidizer and 90% Plexiglas 10% magnesium metal fuel were the propulsion system propellants Eight flight weight propulsion systems were tested over simulated mission duty cycles after being subjected to environmental extremes of temperature (-65 F to 165 F) and humidity

Railway propulsion system

Abstract: A PROPULSION SYSTEM FOR AN INDIVIDUAL CAR OF A RAILWAY TRANSPORTATION SYSTEM COMPRISES A ROTATING DRIVE TUBE EXTENDING LONGITUDINALLY OF AND RESILIENTLY SUPPORTED FROM THE CHASSIS OF THE CARI IN POSITION TO COOPERATE WITH REACTION WHEELS SPACED ALONG THE PATH OF THE CAR AT INTERVALS LESS THAN THE LENGTH OF THE DRIVE TUBE. THE DRIVE TUBE IS DRIVEN AT A GENERALLY CONSTANT SPEED SO THAT THE SPEED OF THE CAR PAST ANY REACTION WHEEL IS DETERMINED BY THE ANGULAR POSITION OF THE REACTION WHEEL RELATIVE TO THE DRIVE TUBE. SOME OF THE REACTION WHEELS ARE JOURNALLED IN PIVOTABLE MOUNTINGS TO BE RESPONSIVE TO EXTERNAL CONTROLS FOR VARYING THE SPEED OF THE CAR PAST THE WHEEL. AUXILIARY POWER MAY BE SUPPLIED DIRECTLY TO A REACTION WHEEL TO SUPPLEMENT THE POWER SUPPLIED THROUGH THE DRIVE TUBE. THE REACTION WHEELS MAY BE USED IN LATERALLY SPACED PAIRS TO CRADLE THE DRIVE TUBE AND THUS GUIDE THE CAR.

Solar electric propulsion system evaluation

Abstract: Solar electric propulsion system performance consisting of thrustors with thrust vector aligning actuators, switching network and flight type power conditioner

Personal propulsion unit

Abstract: A monopropellant propulsion system which is used as an assist unit to augment an astronaut''s jumping ability on the lunar surface. The unit is composed of a tubular framework which fits onto the shoulders of an astronaut and supports a disposable propellant tank adjacent the astronaut''s chest and has thrusters adjacent each side of the astronaut about at the level of the hips. Propellant lines are contained within the tubular framework. Controls are provided for tilting the thrusters toward the front and back as well as for throttling the thrusters. Extensions may be added to the tubular framework to achieve different configurations, such as would be suitable for cargo handling.

Tandem Propeller in Review

Abstract: The tandem propeller system (TPS) for submersible propulsion and control was conceived by the author in 1961. This paper traces its theoretical and experimental development through the most recent tests conducted at Cornell Aeronautical Laboratory. Although the initial configuration was for high-speed nuclear submarines, the emphasis in recent years has been for application to the slower, more maneuverable deep-submergence vehicles. Both configurations are discussed in detail in this paper.

An inflight investigation of air frame effects on propulsion system performance at transonic speeds

Abstract: Airframe flow field effects on propulsion system performance in transonic flight, studying case of underwing aft mounted turbojet engine nacelles

Brake and propulsion controller

Abstract: An improved railway vehicle operator's brake and propulsion controller combining the use of fluidic devices and light-responsive devices with fluid pressure responsive devices for controlling braking as well as propulsion functions of the vehicle, such arrangement thus providing a compact controller requiring less space than present controllers when installed. Operation of the several devices is effected by a manually rotatable shaft having rotary cams arranged thereon for operating certain ones of the devices and which also carries perforated disc members by which light-responsive elements are selectively exposed to or shielded from a light source, depending upon the angular position of the respective disc members to thereby control closing or opening of respective electrical control circuits.

Combined Propulsion Plant for Ships.

Abstract: 1,159,090. Power plant for ships. WARNOWWERFT WARNEMUNDE VEB. May 20, 1968, No.23880/68. Heading F1Q. The plant consists of an internal-combustion engine 1 and a steam turbine 2, having a high pressure stage 2a and a low pressure stage 2b, which acts through gearing 4 upon the propeller shaft. High pressure steam and low pressure steam are generated in the steam boiler 3. An electrical generator 5 is coupled to the steam turbine 2. The drive of the supercharger for supercharging the internal-combustion engine or engines is effected by the steam turbine or turbines.

Fluid propulsion mechanisms

Abstract: Fluid propulsion mechanism, for example, a marine craft propulsion mechanism, a pump or turbine, comprising a drivable impeller for partial immersion in the fluid. The impeller is substantially free of transverse fluid thrust formations and utilizes the friction between the fluid and the impeller for the transference of kinetic energy therebetween. The impeller has formed in a fluid-contacting surface thereof a groove into which fluid can enter, the depth of the groove being equal to or greater than the width thereof.

Plural motor train control with sequential or selective starting for speed control

Abstract: This invention relates to a single or multivehicle propulsion control system having at least two propulsion units. The system is comprised of at least one propulsion unit having a plurality of selectable operating modes and at least one other propulsion unit having a plurality of selectable operating modes. A propulsion control logic unit is operatively coupled respectively to the two just-recited propulsion units. These propulsion units are simultaneously controlled by the propulsion control logic unit to select a predetermined number of combinations of the modes of operation from the propulsion units, the predetermined number of combination modes available exceeding the number of modes available for any one of the propulsion units. The selected combination of modes closely approximates the propelling effort required to maintain the preselected vehicle or vehicles'' speeds free from accelerating and decelerating effects.