Abstract: A completion system comprises a christmas tree (10) mounted on a wellhead housing (11), a tubing hanger (12) landed in the tree or wellhead housing, the wellhead housing (11) being mounted on a casing string (100) and a tubing string (14) being suspended from the tubing hanger within the casing string; wherein, in use, the annulus defined between the tubing (14) and the casing (100) serves as a production bore. A second tubing string (98) is expanded into sealing engagement with the casing string (100) over at least a portion of their lengths. The annulus normally used to provide well service functions is thus eliminated. Well servicing is instead provided via the tubing string (14), which may be coiled tubing.

Abstract: A flow completion system for controlling the flow of fluid from a well bore, the flow completion system comprising a tubing spool which includes a central bore that extends axially therethrough and a production outlet which communicates with the central bore; a tubing hanger which is supported in the central bore and which includes a production bore that extends axially therethrough and a production passageway that communicates between the production bore and the production outlet, the tubing hanger supporting a tubing string which extends into the well bore and defines a tubing annulus surrounding the tubing string; a first closure member which is positioned in the production bore above the production passageway; a first annular seal which is positioned between the tubing hanger and the central bore above the production passageway; wherein the first closure member and the first seal comprise a first pressure-containing barrier between the well bore and a surrounding environment; a second closure member which

Abstract: Disclosed is a method of producing a pressurized stream of substantially inert gas. The method comprises collecting at least a portion of the exhaust gases from an internal combustion engine. The collected exhaust gases are directed into the intake of a compressor which compresses the exhaust gases such that the exhaust gases exit the compressor at a pressure that is above atmospheric pressure. A portion of the compressed exhaust gases are re-circulated back into the intake of the compressor. The re-circulated portion of the compressed exhaust gases are of a sufficient volume to maintain the pressure within the compressor intake above atmospheric pressure and to thereby prevent atmospheric gases from being drawn into the intake of the compressor and into the stream of substantially inert gas.

Abstract: A system for recovering gas trapped within the earth includes a casing (24) sized and configured to be positioned within a borehole in the earth, the casing (24) formed of a material that is transmissive to electromagnetic energy and gas within the earth; an antenna (40) sized and configured to be positioned within the casing (24). The antenna (40) has a distal end and a proximal end and including a radiating element at the distal end of the antenna (40) which, in operation, transmits electromagnetic energy toward a desired area of the earth, and an interior channel for allowing gas to be conveyed from the distal end to the proximal end of the antenna (40).

Abstract: A logging system for use in a wellbore formed in an earth formation is disclosed. The system comprises a tubular conduit (9) extending from surface into the wellbore and containing a body of wellbore fluid, a logging tool string (12) capable of passing from a position within the conduit to a position outside the conduit at a lower end part thereof and capable of being suspended by the conduit in said position outside the conduit, and a pressure pulse device (18) arranged within the conduit in a manner that the pressure pulse device is in data communication with the logging tool. The pressure pulse device is capable of generating pressure pulses in the body of wellbore fluid, said pressure pulses representing data communicated by the logging tool string to the pressure pulse device during logging of earth formation by the logging tool string.

Abstract: Aspects of the invention relate to apparatus and methods for remedial and repair operations downhole. Certain embodiments of apparatus include a lightweight expandable member (22) that can be radially expanded to increased its inner and outer diameters using an inflatable element (34). The lightweight member (22) can be used to repair a fautly safety vavle flapper (12) for example. The invention also relates to lateral tubular adapter apparatus and a method of hanging a lateral from a cased borehole.

Abstract: A gravel packing apparatus comprises multiple joints each having substantially the same construction and each having a perforated outer tubular (150, 152) positioned around a sand control screen (154, 156) including a slurry passageway (190, 194) and a production pathway (188, 192) therebetween. First and second transition members (210, 204) are disposed at opposite ends of each joint. When two such joints are connected together, the second transition member (204) of one joint is proximate the first transition member (210) of the next joint such that a fluid traveling from the slurry passageway (190) of one joint to the slurry passageway (194) of the next joint travels from the exterior to the interior of the second transition member (204) of the one joint and from the interior to the exterior of the first transition member (210) of the next joint.

Abstract: A well completion has an expanded tubing portion and an unexpanded tubing portion. In another embodiment, an expandable tubing is provided and a gravel pack operation is performed. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

Abstract: Methods of uniformly introducing aqueous treating fluids into subterranean producing zones are provided. The methods are basically comprised of the steps of packing perforation tunnels in the producing zone with a particulate solid anhydrous borate material which degrades and dissolves in water over time. A treating fluid is then introduced into the subterranean zone by way of the packed perforation tunnels whereby the treating fluid uniformly flows into the producing zone. The particulate solid anhydrous borate material in the perforation tunnels is allowed to degrade and dissolve in an aqueous fluid in contact therewith so that the aqueous fluid and produced formation fluids freely flow into the well bore.

Abstract: The invention provides a method for the treatment of a hydrocarbon well which method comprises administering down said well polymeric particles having covalently bound to a polymeric component thereof a well treatment chemical or a precursor thereof, said particles containing covalent bonds scissile in an aqueous environment to release or expose said chemical or precursor.

Abstract: A method and apparatus for generating foam cement and placing foam cement in an annulus between a casing and a wellbore. The method includes the steps of displacing cement downwardly in the casing and injecting a gas, preferably nitrogen, into the cement at a predetermined location downhole in the casing. The nitrogen may be injected through a ported sub. The ported sub may be connected in a tubing string that is lowered in the casing. The ported sub has a plurality of ports, which may have nozzles connected therein, that communicate a central opening through the ported sub with an annulus between the ported sub and the casing. The rate at which nitrogen is injected into the cement preferably increases from a leading edge of the cement to a trailing edge of the cement so that a consistent foam cement quality is achieved.

Abstract: Gelatin capsules containing oil field chemicals, preferably weighted with a heavy metal compound, are made more stable under certain conditions by the incorporation of a strong chelating agent. The microcapsules can provide an extended treatment period since many materials that would damage the microcapsules are controlled by the chelating agent.

Abstract: An apparatus for, and method of, lowering items from a drilling rig to a well located below it through the use of a landing string comprised of drill pipe having an enlarged diameter section with a shoulder, in combination with upper and lower holders having wedge members with shoulders that engage and support the drill pipe at the shoulder of the enlarged diameter section, the shoulder of the drill pipe and the shoulders of the wedge members being rotatable with respect to each other.

Abstract: This invention relates to a marine riser tower (112, 114) for use in the production of hydrocarbons from offshore wells. The riser tower (112, 114) includes a plurality of fluid conduits, which may comprise production flow lines (P), gas-lift lines (G), water injection lines (NV) and/or umbilicals (U). The conduits are supported in a single structure, and at least one of said conduits is provided with its own insulation within said structure.

Abstract: A method of preparing and operating a subsea well (23), comprising the steps of: locating a drill-through subsea tree (24) on a subsea wellhead; sealingly connecting a high pressure drilling riser (22) between the tree and a drilling platform at the sea surface; mounting a blow out preventer (16) at the top of the riser (22); drilling the well through the drilling riser and the subsea tree; and establishing a production connection between the tree (24) and a production collection facility at the sea surface through a production riser (52) which is separate from the drilling riser (22).

Abstract: The present invention provides a foam fire-extinguishing agent devoid of environmentally harmful fluorochemical surfactant. The foam fire-extinguishing agent comprises a foamable synthetic surfactant consisting of (a) polyoxyethylene alkyl sulfate ester salt, and (b) at least either one of lauric acid amide propyldimethyl amino betaine acetate and lauric acid amide propylhydroxy sulfobetaine. This foam fire-extinguishing agent may further include at least either one of (c) polyoxyalkylenediamine having both terminal ends substituted with amino alkyl, and derivatives thereof, (d) polyoxyethylene coconut fatty acid monoethanol amide phosphate ester and (e) dodecyl alcohol.

Abstract: Disclosed is an enhanced conformal coating, a process for making the same, and several computer related applications. A commercially available conformal coating is combined with a commercially available blowing agent (sometimes called a “foaming agent”) to create an enhanced conformal coating. The formulation of the enhanced coating is such that it will emit a particular gas when heated to a particular temperature. The enhanced coating is then applied to an object to which pre-damage heat detection is desired. A sensor, located proximate to the object, is then used to detect the emitted gas. Once the gas is detected, actions can be taken to reduce the heat in a manner appropriate for the particular object. Application of the enhanced coating within the computer industry can involve its use with a particular electrical component or a group of electrical components (e.g., a circuit board). For example, the enhanced coating can be applied to one or more circuit boards.

Abstract: A method and a power wrench for detecting the attainment of a target torque level in a screw joint tightening process are provided, wherein an override type torque responsive release clutch is used in the power wrench for defining the target torque level. A microphone is mounted in the power wrench for recording “click” sound(s) developed in the clutch during the release movement of the clutch, and a control unit including a signal identifying device is provided for recognizing the release “click” sound(s) and delivering a stop signal for interrupting the power supply to the motor and/or braking the motor as the clutch is released and the target torque level is achieved.

Abstract: A hammer drill is equipped with a connector shaft, which is rotationally driven by a motor, a spindle that transmits the rotation through a connector shaft, and a percussive impact means that applies a percussive force in the axial direction to a drill bit held by the spindle through performing a reciprocating motion, in the axial direction, relative to a spindle that receives the rotation of the connector shaft through a motion converter mechanism. The hammer drill is provided with a percussive force converter means from the percussive impact means by changing the speed reduction ratio between the motor and the connector shaft. This makes it possible to adjust the percussive force according to the drill bit used.

Abstract: The amount of air dielectric in air core coaxial and twinaxial cables is increased by spacer structures installed between the center conductor and the outer shield which have provision for air voids or pockets running lengthwise. The extra air space provides lower effective dielectric constant for the cable. In one embodiment, a single-element extruded spacer is formed with air cavities or voids that run continuously throughout the length of the spacer. Several spacer “profiles” or cross-sections are disclosed that place less solid dielectric mass in proximity to the center conductor. The result is a greater volume of air dielectric, and hence a lowered cable dielectric constant. In a further embodiment the spacer is a circular cross-sectioned element consisting of a central dielectric strength member surrounded with foamed material. Strength strands such as Kevlar® may be added to the spacer.

Abstract: An electromagnetic wave shield film (1) comprises a transparent base (2), a conductor (4) positioned on the transparent base (2) via an adhesive (3) and having a mesh geometric pattern, and an earth portion (5) arranged around the conductor (4) and including conductive regions (501) which absorb electromagnetic waves, and non-conductive regions (510) which prevent the earth portion (5) from being creased.

Abstract: A NID includes a base and a protective outer cover that is attached to the base for movement between an opened position and a closed position. The base has a channel formed therein, and the outer cover has a corresponding lip that depends outwardly from the outer cover and is received within the channel. The channel and the lip form a watertight seal across the top and along the sides of the NID when the outer cover is closed on the base. With the outer cover in the closed position, a small opening is defined between the lip and the outer edge of the outer cover so that any moisture that accumulates against the outside of the lip drains along the opening towards the bottom of the NID. Accordingly, terminating equipment and wiring connection housed within the NID are protected without the use of an elastic seal or gasket.

Abstract: Provided herein is a junction box in which an electrical conductor may be protected from wet surroundings which comprises an enclosure portion and a cap portion. The enclosure portion has an outer surface, and further includes a plurality of conduit-receiving bosses and a means for anchoring said enclosure portion to the earth. The cap portion includes a hole disposed through its surface, and the enclosure portion and the cap portion each comprise a portion each of a complementary closure means which cooperatively function to sealingly attach the cap portion to the enclosure portion to provide an enclosure/cap construction, wherein said construction further comprises a gasket means for sealing the inner chamber defined by said cap and enclosure from the external surroundings in a waterproof fashion. A junction box according to the invention is especially well suited for subterranean locations.

Abstract: A receptacle for enclosing low-voltage electronic devices and maintaining the integrity of a vapor barrier. The receptacle includes a base, and four side walls. Each side wall is joined to two adjacent side walls to form a perimeter wall. The perimeter wall is joined to the base and extends from it in a generally perpendicular fashion. The perimeter wall and base delineate a generally rectangular enclosure with five closed sides and one open side. A mounting flange is joined to the four side walls and extends from them in a generally perpendicular fashion. The receptacle is positioned within a wall of a building so as to allow at least one flange direct contact with a structural member. The structural members of the wall and the receptacle are both covered with a barrier film. The barrier film is sealingly attached to the flange.

Abstract: A gangable electrical unit for positioning an electrical component beside an electrical outlet box includes a bracket with a wall structure and an adhering element for mounting the wall structure of the bracket on a wall of an electrical outlet box. In one embodiment, the adhering element is positioned on an outward facing wall of the bracket. The invention also relates to a ganged electrical outlet box incorporating the gangable electrical unit.

Abstract: A cross substrate and a method of mounting a semiconductor element are provided in which semiconductor elements can be mounted at a high density. Element side electrodes of a circuit forming surface of a semiconductor element and conductive filaments of a cross substrate are connected in a one-to-one correspondence by solder bumps. Thereafter, sealing is carried out by using a molten epoxy-based resin. In this way, a circuit forming surface side of the semiconductor element is sealed with sealing resin of the cross substrate, with the element side electrodes of the mounted semiconductor element electrically connected to conductive filaments which are wires of a cross substrate.

Abstract: An improved monitoring and control system for a laser in a header assembly of a transmitter optical subassembly (“TOSA”) is disclosed. The monitoring and control system, comprising one or more monitor photodiodes (“MPDs”), is positioned together with the laser on a component submount. The submount in turn is mated with a multi-layer platform (“MLP”) that forms part of the header assembly. The MLP hermetically extends through the header assembly to provide a plurality of electrical interconnects for the laser, MPD(s), and other submount components. In one embodiment, a single MPD is located proximate the laser to receive back facet laser light emission. Measurement of the back facet emission enables the MPD to determine laser intensity. In another embodiment, two MPDs are joined together to receive the back facet laser light emission. Comparison of each MPD's measurement enables the laser's wavelength to be determined and adjusted to optimize its performance.

Abstract: A cable gland assembly for an electric cable having a sheath enclosing at least one conductor core is described, the assembly comprising a body and a barrier sleeve (4) locatable in the body wherein, in use, the at least one core extends through the body and the sleeve (4) and a hardenable compound is disposed in the sleeve (4) filling the sleeve and surrounding the at least one core, wherein the sleeve (4) comprises a resilient or elastic material.

Abstract: The protective electrical outlet device of the present invention is directed to an electrical cover plate, a cover that slides in slots in the cover plate, and a slide plate with male engagement fingers that lock or hold the cover securely in place.

Abstract: The invention relates to an energy transfer system for three-phase current in the average and a high tension range, comprising at least one conductive piece which has at least three cylindrical conductors which are electrically insulated from each other and arranged in a concentric manner. The aim of the invention is to produce an energy transfer system which does not produce magnetic fields in an external area and which has low installation costs. According to the invention, at least one connector part can be connected to the at least one conductive part, in order to link or branch said conductive parts.

Abstract: A wiring harness for connecting electrically between in-vehicle units includes a pitch ribbon cable having a plurality of bridge portions and a connector having a boss and a press-contact portion. Each bridge portion includes first, second and third notches. The third notch is engaged to another boss of the in-vehicle unit in case of assembling the pitch ribbon cable to the in-vehicle unit so that layout of the wiring harness becomes definite. The second notch is engaged to the boss of the connector in case of attaching the pitch ribbon cable to the connector. The first notch is engaged to the press-contact portion of the connector with using the second notch as a positioning reference so that positioning of the pitch ribbon cable becomes definite.

Abstract: A compression connector for securing wires therein is disclosed. The compression connector comprises a first body portion connected to a second body portion, each of the first and second body portions having two pairs of leg portions extending therefrom to form two conductor receiving channels, respectively. The compression connector also has a first pair of slots and a second pair of slots for receiving a cable tie to secure wires therein before crimping. At least one transversely-oriented slot extends between the first pair of slots and the second pair of slots. A method for securing wires within a compression connector is also disclosed.

Abstract: A wire connector for electrically connecting a pair of wires, allows crimping the wires in place and thereafter allows for soldering of the wires. A hollow sleeve, made from heat shrinkable polyolefin with a heat activated adhesive layer, is translucent and tinted and has a tubular-shaped solder member disposed therein. A body member, made from tin plated annealed copper, is disposed within the solder member. The body member has a channel having and a pair of spaced apart hoods the hoods providing a medial opening for visual inspection of the connected wires. A stop member is disposed within the channel. A first wire member is inserted into the channel until it abuts the stop member, while a second wire member, each wire member being either solid or stranded, is inserted into the opposite end of the channel until it abuts the stop member. The first hood and the second hood are each crimped thereby crimping their respective wires.

Abstract: A cable with minimum skew for analog video and minimum crosstalk for data transmission is presented. A UTP cable of the present invention has conductors with nearly identical electrical lengths while providing minimum crosstalk between the conductors in the cable bundle. The electrical lengths of the conductors are sufficiently equal to allow use for analog video networks without undue equalization. In addition, the construction methodology results in a cable with minimum crosstalk thereby providing a cable similar in characteristics with prior art UTP cables used for data networks.

Abstract: A circuit board comprises a board substrate including a substrate layer formed with a pad on an upper surface thereof, and a metal piece soldered on the pad. At least one through-hole including an internal wall formed with a conductive film is provided at a portion corresponding to the pad on the substrate layer. The through-hole is filled with a predetermined filler for closing at least an open mouth of the through-hole at the upper surface of the substrate layer. The pad is connected integrally with the conductive film on the internal wall of the through-hole.

Abstract: The present invention provides a connection structure between a printed circuit board and a flexible circuit board that enables the number of assembly steps including steps using soldering to be reduced and enables detachment of the flexible circuit board to be prevented. Printed-side conductive patterns formed on a printed circuit board is connected with flexible-side conductive patterns formed on a flexible circuit board. The connection structure comprises: two printed-side openings provided in the printed-side conductive patterns of the printed circuit board; two flexible-side openings provided in the flexible circuit board to align with the printed-side openings when the flexible-side conductive patterns are brought into contact with the printed-side conductive patterns; a frame having two leg parts that are inserted through the both openings; and an elastic pressing member interposed between the frame and the flexible circuit board.

Abstract: Providing a method for manufacturing a multilayer wiring board and a touch panel, which does not cause decreasing of yields, reliabilities and productivities even though the materials of each board to be stacked are different, and which manufactures the multilayer wiring board and the touch panel at low cost with high productivities. A multilayer wired board constituting at least part of a electrical circuit board in which a plurality of wired boards are stacked so as to face their wired surfaces each other, wherein: electrical connection parts between the multilayer wired boards are connected through an elastic conductive material part adhered to one of the wired boards; and at least part of a peripheral edge portion of the elastic conductive material part is adhered by a double-sided adhesive material part to seal the plurality of multilayer wired boards.

Abstract: The present invention provides a reamer (100) having at least one journal body (110) and at least one toroidal cutter body (116). The toroidal cutter body (116) has a maximum diameter (MD), an outer perimeter (OP) and a plurality of cutting elements (112, 145, 149) on the cutting surface (118). The toroidal cutter body is rotatably attached to the journal (110). When in the installed position, the axis of rotation (RA) of the at least one toroidal cutter body (116) intersects the longitudinal axis of the drill string at an acute angle.

Abstract: Disclosed is an apparatus for producing a pressurized stream of substantially inert gas. The apparatus includes a compressor having an intake manifold and an output manifold. The intake manifold receives a substantially inert gas stream and the output manifold receives a stream of pressurized gas from the compressor. The apparatus further includes a compressed gas re-circulation conduit connecting the output manifold to the intake manifold such that a portion of the pressurized gas from the compressor is re-circulated from the output manifold back to the intake manifold to maintain the gas pressure within the intake manifold above atmospheric pressure and to prevent atmospheric gases from being drawn into the intake manifold.

Abstract: Coolant hole drills are very costly and by that are times not used as often as they could be. By utilizing a coolant drill head, the material could be cobalt or carbide, the coolant drill costs would be reduced substantially. The problem users encounter with replaceable drill heads is strength and concentricity. Here is a system that maintains both strength and concentricity.

Abstract: The disclosure relates to a process for controlling body weight in which selection of food servings is based on a calculated point value and a range of allotted daily points which is adjusted for weight change. The calculated point value is a function of measured calories, total fat and dietary fiber for serving sizes specified in readily estimatable units. A range or maximum number of points allotted per day may be calculated based on current body weight, caloric reduction to be achieved, physical activity level, and physical activity duration.

Abstract: A system and method that allows one to mark information with a pencil or conductive ink on paper equipped with a RFID type circuit, and have the marked information provided to the RFID circuit, or have the written information cause the RFID circuit to perform some function. The marked entered information may be corrected by erasing the written information with a pencil eraser and writing new information on the paper with a pencil. Information may also be marked into a RFID circuit or have the marked information cause the RFID circuit to perform some function by utilizing a standard ink jet computer printer to print lines on paper equipped with a RFID type circuit, by having the printed lines perform the function of wires. The aforementioned printed information may be modified by having an individual connect different printed wires by drawing a penciled line between the wires or by punching holes in the printed lines.

Abstract: An aircraft handler (10) for use with an undercarriage of an aircraft, the handler being self-propelled and comprising a generally “U” shaped body (11) having arms (12 & 13) linked by a bridge (14) at one end thereof with a pair of drive wheels (16 & 17) located one at the free end of each arm, with at least one wheel(15) located adjacent the bridge(14). A pair of clamping jaws (51) are mounted on the body (11) between the drive wheels (16 & 17) and the bridge (14)and jaws (51) have a lower profile than the arms (12 & 17). The drive wheel (16 & 17) are driven by DC electric motors powered by batteries stored in the arms.

Abstract: A vehicle is installed with an integral transaxle apparatus constructed so that a single housing contains left and right axles, a driving hydrostatic transmission (HST) having a variable displacement first hydraulic pump and a first hydraulic motor fluidly connected with each other, a steering HST having a variable displacement second hydraulic pump and a variable displacement second hydraulic motor fluidly connected with each other, and a differential unit differentially connecting the axles with each other so as to be driven regularly or reversely by the output of the driving HST and to differentially drive the axles while receiving the output of the steering HST, wherein the first hydraulic pump receives power of a prime mover and has a first movable swash plate, and the second hydraulic pump receives power of the prime mover independently of the first hydraulic pump and has a second movable swash plate.

Abstract: A legged mobile robot leg structure is provided in which a lower leg part (24) is connected to the lower end of an upper leg part (23) through a knee joint (27), a foot part (25) having a six-axis force sensor (60) is connected to the lower end of the lower leg part (24) through an ankle joint (28), and the ankle joint (28) supports the foot part (25) so that the foot part (25) can pitch around a lateral axis (Ly) and roll around a fore-and-aft axis (Lx) relative to the lower leg part (24). A pitch motor (34) for making the foot part (25) pitch around the lateral axis (Ly) is supported on the lower leg part (24) at a position above the ankle joint (28), and a roll motor (35) for making the foot part (25) roll around the fore-and-aft axis (Lx) is supported on the lower leg part (24) at a position above the ankle joint (28).

Abstract: A wheelchair having two driven wheels (40) and at least one castor (1) which is mounted in a rotatable manner in a fork (2) which can be pivoted about a vertical axis (H), the fork (2) being connected to a steering linkage (3, 3′, 30), is distinguished in that the connection between the fork (2) and the steering linkage (3, 3′, 30) is releasable.

Abstract: A motor driven vehicle includes an electric motor that drives wheels through a power source and an electric motor control unit that drives the electric motor. When a voltage of the power source is a predetermined value or greater, the electric motor control unit controls the electric motor such that rotational speed-torque characteristics that the electric motor has are maintained when the voltage of the power source is at the predetermined value.

Abstract: A hybrid power source includes first and second energy inputs such as an electric motor (14) and an internal combustion engine (20). A power source strategy is implemented in which a cost function is constructed associated with various power distribution options to allows improved distribution of power. For a specific cost (z=constant), the total amount of energy is obtained by integrating during a normalised driving cycle the generating power against time. Thereby a look-up table energy/cost is created.

Abstract: An electrical scooter includes a chassis having front and rear ends to which front and rear wheels are mounted. A seat is mounted on the chassis for supporting a rider thereon. A steering shaft is rotatably mounted to the front end of the chassis in an upright manner and has a lower end attached to the front wheel for swiveling the front wheel. A control device is mounted to an upper end of the steering shaft. An electrical motor is mounted to one side of the front wheel and coupled to the front wheel for driving the front wheel under the control of the control device. Since the motor is mounted to one side of the front wheel, the weight of the motor induces a torque to the steering shaft and thus yawing the front wheel and making directional offset of the scooter in the moving thereof. An offset compensating device is provided to overcome the directional offset of the electrical scooter.

Abstract: Three aspects are disclosed of an airstream control system for a hovercraft that includes a platform and a lift gas chamber beneath the platform. Firstly, the system includes an impeller for receiving air at an inlet and discharging pressurized air at an outlet as an airstream. The impeller is positioned above an orifice of the lift gas chamber. The impeller is supported along a first axis transverse to the airstream and about which the impeller is rotatable by a first axis frame that is rotatable about a pair of first axis supports fixed to the platform. The impeller is further supported along a second axis transverse to the airstream and about which the impeller is rotatable by a second axis frame that is attached to the first axis frame and that comprises a first arm supporting a first point of the impeller and extending upstream of the impeller.