Abstract: A system and related methods for providing stall recovery guidance symbology via a head-up display (HUD) or similar avionics display element detects stall or near-stall conditions and provides symbology to guide the pilot through recovering from the stall by prioritizing pitch correction and disengagement of the autopilot system. Pitch correction symbology guides the pilot toward reducing the aircraft angle of attack and establishing level flight, while thrust recovery symbology helps the pilot control the application of thrust to avoid prolonging or reinstituting the stall. The system modifies the stall recovery symbology in response to detected changes in pitch, angle of attack, or airspeed. Once level flight has been established and stall conditions are no longer present, the system may transition out of stall recovery mode to regular inflight symbology.

Abstract: A differential pressure-induced airflow based approach is used to measure Angle-Of-Attack (AOA) or Angle-Of-Sideslip (AOS) for an aircraft. Ports on opposing sides of an aircraft fuselage are coupled by an airway incorporating a mass airflow sensor. As the relative wind's angle of incidence changes direction with respect to the aircraft's longitudinal axis or wing chord, a differential pressure is created. The differential pressure induces an airflow between the ports whose magnitude is measured by a mass airflow sensor. The resulting airflow is a function of the respective AOA or AOS. The measured airflow and air data computer supplied parameters of airspeed (or dynamic pressure) and altitude (or static pressure) are utilized by an algorithm that reduces the data into angular AOA or AOS measurements.

Abstract: An indicator device captured between couplers of ends of firehose sections that point to the source of the firehose and to safety. The preferred embodiment includes gasket-like annular body which fits over the male threads of the male coupler and is captured between annular ends of the abutting male and female coupler bodies. Direction pointing fingers, integral with the annular body, point backward toward the hose section to which the male coupler is attached and are angularly oriented to fit between longitudinal lugs of the male coupler.

Abstract: A bowthruster is operated by a control unit with wind direction based on a detection signal from vane-anemometer. A bow in a hull attitude is slightly adjusted so as to direct a bow of the hull to windward. At the same time, a propulsion unit is operated by control unit in accordance with wind strength based on a detection signal from vane-anemometer. A hull position is slightly adjusted such that the hull is moved based on a distance carried away by wind. Rocking of the hull is reduced by always directing the bow to windward and also the hull is stayed at a constant point located directly over shoal of fish or gathering place for fish so as to enable the pleasant fishing. Accordingly, because of good control response and fine ship position adjustment, the hull is positioned quickly in a fishery and then maintained at a predetermined point in the fishery.

Abstract: A wind direction indicator is disclosed having a rotatable wind vane 1 and a support 10 for connection to the mast of a yacht. The vane 1 is connected to the support 10 by means of a gimbal mechanism 6-9 and a stabilizing weight 4 is connected to the gimbal mechanism diametrically opposite the vane 1.

Abstract: Masthead device for sailboats that indicates apparent wind direction composed of a rotating wind vane and a protractor arm encompassing multiple reference marks. These marks can be adjusted with greater compass accuracy to allow several settings in each quadrant creating a series of reference points enabling one to more accurately determine the apparent wind angle from a center point, and thus optimize sail trim, heading and boat speed.

Abstract: There is provided a device useful for adjusting the main sail of a sailboat said device being equipped with apparent wind indicating means and color coded means for indicating desirable position for the boom of said main sail; said device being used alone or in combination with the main sail control sheet having color coded portions or with actual boom position indicating means having color coded sections; said color coded portions and color coded sections coinciding with the color coded desirable boom position indicating means.

Abstract: Disclosed is a method of visualizing laminar to turbulent boundary layer transition, shock location, and laminar separation bubbles around a test surface. A liquid crystal coating is formulated using an unencapsulated liquid crystal operable in a temperature bandwidth compatible with the temperature environment around the test surface. The liquid crystal coating is applied to the test surface, which is preferably pre-treated by painting with a flat black paint to achieve a deep matte coating, after which the surface is subjected to a liquid or gas flow. Color change in the liquid crystal coating is produced in response to differences in relative shear stress within the boundary layer around the test surface.

Abstract: A wind indicator for a sailboat has a wind vane on a vertical shaft which is mechanically coupled with a horizontal shaft turning a pointer. The wind angle relative to the boat is indicated by the pointer on a circular dial. Two windward pointing indicators are mounted from the mast. A reaching wind indicator is mounted at the stern.

Abstract: The subject indicator is a lightweight conical or cone-like member attached to a test surface at its apex by a flexure pivot. The indicators are useful, in a range of sizes, for providing visual indication of the direction and state of fluid flow past the attachment point of each indicator. The flexures may be made of string, cord or the like or, for higher temperature applications, one or more links of chain. The indicators are stable in action and do not whip.

Abstract: A miniature wind sock assembly adapted to be coiled and inserted into a small plastic display container. The wind sock is supported on a spring mast in turn fixed to a spring base bracket that is designed to be attached either to standard bicycle handlebars or to standard adjustable headband hats.

Abstract: A plexiglass or similar plastic windvane that has beveled peripheral edges or is otherwise provided with surface markings from which light rays impinging thereon exit from the plexiglass causing illumination of the edges or markings, whereby the windvane is effectively used at night or under conditions of diminished visibility to designate wind direction.

Abstract: Presented is a method and means for monitoring the angle of attack of an airfoil and displaying the monitored angle of attack as a visual reference to the pilot.

Abstract: An airflow direction indicator in accordance with the invention is intended for sailboards, in which the front portion of the sail includes a tunnel which is slipped onto the mast and is rotatable relative thereto when varying the sheeting and curvature of the sail. In accordance with the invention, the indicator is supported by a fitting to be attached to the forward portion of the tunnel, this fitting carrying a mounting shaft forming an acute angle to the longitudinal direction of the tunnel and mast, and carrying a wind vane which is biased to return to a substantially vertical position adjacent the tunnel with the main longitudinal direction of the vane substantially parallel with the longitudinal direction of the fitting and tunnel, respectively, when the fitting is held in a vertical position, whereby the vane will indicate changes in the direction of the flow of air around the forward edge of the sail.

Abstract: A wind direction indicator for a sailboat includes a mounting bracket for mounting on the forestay of a sailboat with a support frame extending forward of the mounting bracket and including a generally Y-shaped wire frame with the arms of the Y serving as optimum direction indicator means for alignment with a wind direction indicator in the form of a wind vane. The mounting or support frame includes pendulum for maintaining the frame of the indicator device in a level position. Optimum heading for the boat is indicated when the wind direction is in alignment with one of the arms of the frame.

Abstract: An airplane angle of attack and direction of flight indicator includes a vane on the outside of the fuselage which is pivotally movable in response to changes in the airplane's angle of attack. A group of optical fibers are supported within the airplane with one end positioned for exposure to a light source. A light shield is movable into and out of blocking relation between the light source and optical fibers in response to pivotal movement of the vane. With the opposite ends of the optical fibers arranged in an indicator in the airplane cockpit, the illumination of fibers at the indicator affords a ready indication of the airplane's angle of attack. With the opposite ends of the fiber arranged in vertically spaced relation, a sighting device may be interposed between the pilot and indicator for establishing a line of sight along the actual direction of flight.

Abstract: A wind direction device for attachment to a boat shroud for indicating the direction of the wind relative to the direction of travel of the boat. The device includes several wraps of adhesive tape around a boat shroud to form an upwardly facing shoulder at a mid-point of the shroud of the boat, a bearing resting on the shoulder and having a hole through which is received the shroud, which bearing has a slit in one side and is sufficiently flexible and resilient so that the size of the slit can be varied to position the bearing around the shroud and retain the bearing on said shroud, a tubular mandrel resting on the bearing and having a bore through which the shroud is received, the mandrel having a slit traversing the length of the mandrel, the mandrel being of sufficient flexibility and resilience such that the size of the slit can be varied to position the mandrel around the shroud and retain the mandrel on the shroud, and a resilient vane connected to the periphery of the mandrel.

Abstract: The sailing indicator assembly is constructed to space the tail from the sail and to maximize the force effect of a light wind to keep a wet tail from sticking to the sail. More particularly, the inner end of the tail is mounted to a spacer member, the inner end of which is connected to a base. The base is in the form of a wedge having an upwardly slanted surface in a downwind direction, driving the wind outwardly and angularly against the inner portion of the tail. The base is preferably at least as wide as the tail. The spacer member is constructed to collapse if anything engages it, such as when the sail is folded or rolled for storage. More particularly, the spacer member is elongated to provide the spacing function and is flexible to permit collapse thereof.