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Topic: Yaw

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	Aircraft Yaw Motion
		The yaw axis is perpendicular to the wings and lies in the plane of the aircraft centerline.
		The yawing motion is being caused by the deflection of the rudder of this aircraft.
		The rudder is a hinged section at the rear of the vertical stabilizer.
	www.grc.nasa.gov /WWW/K-12/airplane/yaw.html (374 words)

	Aircraft Control - Wright 1902 Glider
		The yaw axis is defined to be perpendicular to the plane of the wings.
		A yaw motion is a movement of the nose of the aircraft from side to side.
		The pitch axis is perpendicular to the yaw axis and lies in the plane of the wings.
	wright.nasa.gov /airplane/control.html (606 words)

	DECELERATION IN A YAW (Site not responding. Last check: 2007-11-07)
		A little known fact in accident reconstruction is that the radius of a yaw and the distance slide to stop are directly related.
		The road surface and the yaw marks must be used to accurately determine slip angle.
		It is usually easier to transfer the data to a scale diagram of the area of the yaw including the marks left by the tires on the road surface.
	www.rec-tec.com /yaw.html (1794 words)

	Yaw Error Angle Monitoring
		After the unwrapping the yaw angle is computed along the orbit and yaw information (mainly the mean yaw and standard deviation per orbit) are sent to ESOC to re-compute and uplink on satellite new AOCS parameters.
		Yaw error angle is also estimated by analysing the Scatterometer raw data.
		In particular from the Doppler frequency shift of the received echo is possible to retrieve the yaw error angle.
	earth.esa.int /pcs/ers/yaw (492 words)

	Yaw Dampers Explained
		Yaw Damping is provided by two completely independent dampers which can be operated singly or simultaneously.
		Rudder displacement resulting from yaw damper input is limited to 5 deg to prevent full rudder being applied in the event of a yaw damper malfunction.
		Two yaw damper warning flags on the rudder and elevator position indicator are biased out of view when the respective yaw damper is engaged.
	www.boeing-727.com /Data/systems/infoyawdampers.html (256 words)

	Aerospaceweb.org \| Ask Us - Helicopter Yaw Control Methods
		In previous answers concerning the yaw control of helicopters (#1 and #2), we discussed how a tail rotor is used to maintain yaw control and counteract the torque effect.
		Yaw control is achieved by tilting the rotors in opposite directions (to the left and right in the case of the CH-46).
		Yaw control is achieved by increasing the blade pitch on one rotor while decreasing the pitch on the other.
	www.aerospaceweb.org /question/helicopters/q0034.shtml (1465 words)

	Rudder - Yaw
		The vertical stabilizer prevents side-to-side, or yawing, motion of the aircraft nose.
		Because the rudder moves, it varies the amount of force generated by the tail surface and is used to generate and control the yawing motion of the aircraft.
		The rudder input insures that the aircraft is properly aligned to the curved flight path during the maneuver.
	www.grc.nasa.gov /WWW/K-12/airplane/rud.html (649 words)

	Microlab-1 Sun Tracking, Yaw Steering, and the GPS-MET Payload
		In optimal yaw steering mode, the spacecraft is maintained with its +X (nominal velocity direction) face directed toward the sun at all times, as the spacecraft orbits in its upright attitude.
		The amount of steering the spacecraft must do in optimal yaw steering mode depends on the current beta angle of the spacecraft's orbit, that is on the sun's angular proximity to the spacecraft's orbit.
		However, commanded yaw angles may be "faired in" to the spacecraft's attitude trajectory if it is done with attention to attitude performance and dynamics.
	www.cosmic.ucar.edu /gpsmet/attitude.html (871 words)

	The Wind Turbine Yaw Mechanism
		The wind turbine yaw mechanism is used to turn the wind turbine rotor against the wind.
		Wind turbines which are running with a yaw error are therefore subject to larger fatigue loads than wind turbines which are yawed in a perpendicular direction against the wind.
		The yaw mechanism is activated by the electronic controller which several times per second checks the position of the wind vane on the turbine, whenever the turbine is running.
	www.windpower.org /en/tour/wtrb/yaw.htm (448 words)

	Yaw-Wise Torque Budget [Ch. 8 of See How It Flies]
		It is much nicer to yaw the plane to align its axis with the new direction of motion, so you apply the rudder, thereby creating a yaw rate that matches the MV-turn rate.
		This causes the airplane to yaw to starboard.
		Yawing the airplane changes the direction it is pointing which does not automatically change the direction it is going; the “boat turn” effect exists but is feeble and inefficient.
	www.av8n.com /how/htm/yaw.html (8618 words)

	Yaw - Art History Online Reference and Guide
		Yaw or Yam is the name for the Levantine god of chaos and the power of the untamed sea as found in texts from the ancient city of Ugarit.
		Since Yaw/Yam wishes to raise himself to the lofty heights of the gods whom he hates, and since he is the lord of chaos and destruction, the nearest equivalent in modern thought to Yaw/Yam is the Devil.
		Yaw is also an aeronautical and nautical term which indicates how far a craft is pointing away from its direction of travel due to rotation about its vertical axis.
	www.arthistoryclub.com /art_history/Yaw (312 words)

	Air propellers in yaw (Site not responding. Last check: 2007-11-07)
		In addition to the usual propeller coefficients, cross-wind and vertical forces and yawing, pitching, and rolling moments were determined about axes having their origin at the intersection of the blade axis and the axis of rotation.
		With a yawed propeller an appreciable thrust was found for v/nd for zero thrust at zero yaw.
		Yawing a propeller was found to induce a pitching moment that increased in magnitude with yaw.
	naca.larc.nasa.gov /reports/1937/naca-report-597 (171 words)

	Aerospaceweb.org \| Ask Us - Adverse Yaw and Aircraft Turns
		To understand what adverse yaw is, we need to first explain the axes of motion for an airplane.
		Yaw control is most often accomplished using a rudder located on the vertical tail.
		As in the case of Frise aileron, this differential profile drag produces a yawing motion that at least partially offsets the adverse yaw, but the effect is limited.
	www.aerospaceweb.org /question/dynamics/q0045.shtml (1044 words)

	Aerospaceweb.org \| Ask Us - Adverse Yaw
		You are also correct that adverse yaw would cause the nose to yaw to the left, thereby partially opposing the desired direction of roll.
		Adverse yaw is caused by the fact that the wing with the down aileron generates more drag than the wing with the up aileron.
		If it is based on real-life experience, the aircraft in question may not suffer from adverse yaw or its effects may have been too small to notice at the conditions you were flying at.
	www.aerospaceweb.org /question/dynamics/q0135a.shtml (434 words)

	AC 90-95 - UNANTICIPATED RIGHT YAW IN HELICOPTERS (Site not responding. Last check: 2007-11-07)
		Unanticipated right yaw, or loss of tail rotor effectiveness (LTE), has been determined to be a contributing factor in a number of accidents in various models of U.S. military helicopters.
		If a yaw rate has been established in either direction, it will be accelerated in the same direction when the relative winds enter the 120° to 240° area unless corrective pedal action is made.
		It is imperative that the pilot maintain positive control of the yaw rate and devote full attention to flying the aircraft when operating in a downwind condition.
	avstop.com /Helicopters/901 (2731 words)

	* Yaw - (Boating): Definition
		YAW - To swing or steer off course, as when running with a quartering sea...
		spar from which a square sail is suspended yardarm The tapering end of a yard yaw or yawing To turn from side to side in an uneven course.
		Yaw- To swing or steer off course, as running with a quartering sea.
	en.mimi.hu /boating/yaw.html (298 words)

	Prevalence of a sensory over a behavioral predictor in Drosophila yaw torque learning (Site not responding. Last check: 2007-11-07)
		However, rearranging the contingencies between colors and yaw torque in the test reveals that the behavior has entered into the association with the US during the composite training but is accessible only as B-CS compound in the subsequent memory test.
		During training, heat is applied whenever the fly's yaw torque is in one domain and switched off by the shutter when the torque passes into the other (henceforth: yaw torque sign inversion).
		As in yaw torque learning, the fly is heated whenever the fly’s yaw torque passes into the domain associated with reinforcement.
	www.brembs.net /learning/drosophila/switch.html (4275 words)

	The Influence of Yaw on Shell Penetration (Site not responding. Last check: 2007-11-07)
		It was found that yaw increased the velocity the bullets needed to achieve penetration by a very significant margin.
		The degree to which yaw is induced in a penetrating shell is also influenced by striking velocity, impact angle, shell head shape, and the presence of a cap, amongst other factors.
		In practice the generation of yaw during the attack of spaced armour is likely to be an important effect only when the spacing is large, although the difficulty of the first target attacked will have an important bearing on the distance traveled before the yaw amplitude of the shot becomes significant (Ibid., pp.
	members.aol.com /ghe101/The_Influence_Of_Yaw.htm (754 words)

	MedlinePlus Medical Encyclopedia: Yaws
		Yaws is a chronic infection caused by the bacteria Treponema pallidum, subspecies pertenue, which primarily affects the skin, bones, and joints.
		There is no specific blood test for yaws, but because it is closely related to the bacterium that causes syphilis, the blood tests for syphilis may be positive in yaws as well.
		Yaws can be disfiguring and disabling because it may cause gross destruction of the skin and bones.
	www.nlm.nih.gov /medlineplus/ency/article/001341.htm (581 words)

	Dorlands Medical Dictionary
		guinea corn yaw, a lesion of yaws that resembles a grain of corn (maize).
		(yaws) (yawz) [from Caribbean Indian name for the disease] an endemic, infectious, tropical disease caused by Treponema pertenue, usually affecting persons under age 15, and spread by direct contact with skin lesions or contaminated fomites.
		crab yaws, yaws characterized by hyperkeratosis with fissuring and ulceration of the soles of the feet, and less commonly involving the palms of the hands.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_y_01zPzhtm (1240 words)

	F-15 Flight Controls - Yaw and Roll
		The combined lateral acceleration and yaw rate sensor feedback voltages are compared with the rudder trim position and the combined output is used by the Proportional plus Integral (P + I) circuit to apply rudder surface deflection in a direction to eliminate the sideslip.
		Pilots can expect to see yaw trim changes varying in magnitude with different aircraft anytime the landing gear is extended or yaw CAS is disengaged.
		During preflights (maintenance and aircrew), ground personnel should double check to insure that yaw CAS inserts an additional 50 percent (or 15 degrees) of rudder surface deflection, making a total surface movement of 30 degrees (these figures are approximate).
	www.f15sim.com /operation/f15_yaw_control.html (2323 words)

	Tech Topic I001 - Yaw & Pitch (Site not responding. Last check: 2007-11-07)
		Yaw and pitch is the deviation of the probe from the true alignment into the air stream.
		Responsible manufacturers recognise the probe's inability to simulate a laboratory or test facility and therefore design their probes to allow for the effects of yaw and pitch to enable accurate and repeatable readings to be taken by the user.
		It is recommended that potential buyers of instruments inquire about the probe's degree of tolerance to yaw and pitch before the accuracy and repeatability is affected and deviates from manufacturer's accuracy statement.
	www.airflow.com /techtop/techi001.htm (527 words)

	Case Study: Culture Clash
		Yaw spoke excellent-if somewhat British-English, was quick to smile, and was a good student who often tutored Henry in math.
		Yaw often cooked Ghanaian food on a hotplate in their room because he didn't like cafeteria food.
		Other students from Ghana started gathering in their room as a home away from home; Yaw's personal grooming habits were much different than Henry's; Yaw often wore traditional clothes that embarrassed Henry when they walked together; and Yaw was inevitably late when they went places together.
	highered.mcgraw-hill.com /sites/0072332123/student_view0/chapter8/case_study.html (504 words)

	BDS - Yaw Dampener
		Picture it you are in a comfortable flight with friends in your beautiful Bonanza and all of a sudden your aircraft begins to yaw excessively.
		To solve the excessive yaw, we developed a means of blunting the strength of the initial lateral thrust.
		At the same time the yaw damper serves to damp the continuing oscillations around the vertical axis as the aircraft seeks to align itself with its course.
	www.beryldshannon.com /products/yaw.htm (247 words)

	View > Local Move camera > Yaw/pitch
		Changes yaw (horizontal rotation) and pitch (vertical rotation) of the camera.
		To yaw is to rotate horizontally, that is to the left or right.
		To pitch is to rotate vertically, that is to plunge or rise.
	www.alias.com /eng/support/studiotools/documentation/Reference/ViewLocalMovecameraYawpitch.html (451 words)

	An A300-600 uncommanded yaw event - 03 Dec 02
		Any yaw could amplify static port errors as the ports (one on each side of the aircraft) are individually and alternatively airflow-blanked and then subjected to an error-inducing inflow (as the face of a port on one side becomes unblanked during a yaw cycle - and then presented obliquely to the airflow).
		Preliminary results of the investigation of the incident airplane’s autopilot yaw actuator indicate that the electrical connectors between the actuator’s two main valves and the airplane’s two flight control computers (FCC) were crossed between side 1 and side 2.
		This hidden failure in combination with a failure of the clutch valve resulted in the autopilot yaw actuator remaining engaged when the crew disconnected the autopilot, allowing the actuator to remain hydraulically pressurized and provide inputs to the rudder and the rudder pedals.
	www.iasa-intl.com /folders/the068event/the068event.html (1608 words)

	Yaw Disturbance Attenuation By Robust Decoupling Of Car Steering - Ackermann (ResearchIndex) (Site not responding. Last check: 2007-11-07)
		In the present paper the yaw disturbance attenuation is analyzed for a generic single-track vehicle model.
		For specific vehicle data, it is shown that this control law significantly reduces the influence of yaw disturbances on yaw rate and side-slip angle for low...
		2: Robust unilateral decoupling of the influence of the yaw motion on the lateral a..
	citeseer.ist.psu.edu /239456.html (427 words)

	Yaw Bearing
		The yaw motor has a small wheel that engages a huge wheel.
		The large wheel is called the yaw bearing.
		On some yaw bearings the teeth point outwards, while on others they are turned inwards.
	www.windpower.org /en/kids/choose/nacelle/yawbea.htm (53 words)

	News: Radian to "Reinvent" H-3 Helicopter Yaw Bell Crank
		The labor cost of these inspections includes gaining access to the yaw bell crank by removing portions of unique mission equipment.
		There is also a concern that frequent removal and replacement of the yaw bell crank might introduce secondary failures.
		The objective of this effort is to rapidly reinvent, produce, and first article test alternative designs of the yaw bell crank to establish a production process for government review, subsequent approval, and low-rate initial production of 50 articles.
	www.helis.com /news/2001/h3reinv.htm (258 words)

	The S-TEC Approach Newsletter July 1998
		The ability to perform a quick bench test can be a valuable troubleshooting tool during initial installation of a yaw damper system, or whenever a yaw damper system is suspected of a malfunction.
		Hold the yaw amplifier so that it is in a vertical position with the "up arrow" at12 o'clock (0°).
		Tilt the yaw damper amplifier 30° clockwise using the triangle for reference.
	www.s-tec.com /s-tec/newsletters/approach798/bench798.html (568 words)

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