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Topic: Stall (flight)

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	Stall - Wikipedia, the free encyclopedia
		In a theatre or concert hall auditorium, the stalls are the seats on the ground floor directly in front of the stage.
		The loss of lift in an aircraft when the critical angle of attack is exceeded results in a stall (flight).
		An instruction pipeline of a modern CPU may stall when execution cannot continue because previous events that the current instruction is dependent on has not yet completed.
	www.wikipedia.org /wiki/Stall (218 words)

	All-axis control of aircraft in ultra deep stall - Patent 4261533
		The wing 14, not yet stalled, produces lift 40 upward and generally perpendicular to the wing chord; and the thrust 42 of the engine 16 is forward and parallels the axis 24 of the fuselage 12.
		Return of the aircraft from ultra deep stall flight to conventional, horizontal, forward flight, or to any desired flight mode, is accomplished merely be returning the stabilizer surface from the steeply tilted condition to its normal orientation relative to the axis 24 of the fuselage 12, i.e.
		In less than one second the aircraft was returned to conventional flight by reverting the stabilizer from the fully tilted ultra deep stall position, with leading edge down at an angle of 70 to 90 degrees from the horizontal axis of the fuselage, to the conventional position substantially parallel with said axis of the fuselage.
	www.freepatentsonline.com /4261533.html (5311 words)

	Pilot's Web The Aviators' Journal - Load Factor
		In an unaccelerated level flight the load on the wings is equal to lift and to the weight.
		A stall occurs when the angle of attack is increased to such a value where the smooth flow of air over the airfoil breaks up and tears away, producing an abrupt change of characteristics and loss of lift.
		In a straight-and-level unaccelerated flight, a load factor of 1G is always present, but certain maneuvers are known to involve relatively high load factors.
	www.pilotsweb.com /principle/load.htm (1444 words)

	Banked flight stall warning device and method - Patent 6169496
		A flight warning system comprises an outside temperature probe for sensing outside temperature, a gyroscope for sensing aircraft bank angle, a static transducer for sensing static pressure, and a dynamic pressure sensor for receiving total pressure from a pitot tube.
		A flight warning system as recited in claim 17, wherein determining whether said aircraft is entering said stall cylinder is determined by comparing aircraft bank angle with stall bank angle, whereby said stall exists when the aircraft bank angle is greater than or equal to the stall bank angle.
		A method is also disclosed for indicating a theoretically safe flight path for an aircraft after a power failure during a departure flight of the aircraft including the steps of sensing a plurality of parameters; and, determining and indicating the theoretically safe glide path.
	www.freepatentsonline.com /6169496.html (5632 words)

	Fleet E-960: NACA Aircraft in hangar 1953 - clockwise from front center: YF-84A, D-558-1, D-558-2, B-47, X-1 ship 2, ...
		Flight research by NACA pilots indicated that this thicker wing produced 30 percent more drag at transonic speeds compared to the thinner wing on the first X-1.
		After a final flight on October 23, 1951, the aircraft was grounded due to the possibility of fatigue failure of the nitrogen spheres used to pressurize the fuel tanks.
		The results were mixed; the X-5 had vicious stall behavior due to the poor position of the tail and stabilizers.
	www.dfrc.nasa.gov /gallery/photo/Fleet/HTML/E-960.html (1002 words)

	Flight Performance in EAW (www.combatsim.com)
		It appears to me that many of the discussions under estimate how much of a combat pilot's flight training is dedicated to maneuvering at the edge of the envelope without pushing too far.
		In simplest of terms, stalls, spins, and other types of departures are nature's ways of punishing the pilot for pushing the aircraft too far.
		As you may recall from other discussions on the physics of flight, the aircraft produces maximum lift (which is critical for both turn rate and turn radius performance) at maximum angle of attack (AOA).
	www.combatsim.com /htm/dec98/eaw-flite.htm (727 words)

	Stall
		A malfunction in the flight of an aircraft in which there is a sudden loss of lift that results in a downward plunge; "the plane went into a stall and I couldn't control it".
		A dangerous stall is one where the nose rises, pushing the wing deeper into the stalled state and potentially leading to an unrecoverable deep stall.
		A stall strip is a small sharp-edged device which, when attached to the leading edge of a wing, encourages the stall to start there in preference to any other location on the wing.
	www.websters-online-dictionary.org /st/stall.html (3000 words)

	ACI Stall Warning Aircraft list
		A stall warning can provide a timely reminder if speed control on approach is lacking, and contributes towards a safe controlled arrival.
		The sensor unit is mounted on the leading edge of the wing, and the alarm is actuated by upward movement of the sensor vane.
		It is still possible to remove the sensor unit for service/repair etc. With the stall warning unit fitted, PFA Engineering may not require the inboard stall strips, thus significantly improving take off performance.
	homepages.which.net /~aci.stw/faq.htm (1193 words)

	Stall Speed in Straight and Level Flight
		Thus, we can make a special case definition that the straight and level stall speed is the minimum speed at which the wings can produce lift equal to the weight of the airplane.
		It is the stall speed generated by this equation which is quoted in the owners manual of the aircraft we fly.
		Now that we know that Air Density is a factor in the Stall Speed equation it is obvious that when an aircraft manufacturer publishes the Stall Speed of an airplane it must be based on a certain altitude (Air Density) value.
	selair.selkirk.bc.ca /aerodynamics1/Lift/Page9.html (672 words)

	Site Map of Flightplan Calculators
		Comprehensive flight navigation log (printable) for the quick and easy generation of computed flight plans.
		Input: Callibrated airspeed, flight level, temperature, direction and velocity of winds, true track, variation, deviation, leg distances, fuel consumption rate, beacon identifiers, destination runway nos.
		Simple flight navigation log (printable) for the quick and easy generation of computed flight plans in the most conventional format.
	www.flightplan.za.net (1014 words)

	Fully developed stall, is it safe??? - Page 2 - Flightinfo.com Hangar
		In fact, the one I'm flying tomorrow has been stalled continiously for 36 hours this weekend and it'll be just fine.
		May be time to look for a new CFI.Full stalls and a spin demo should be don some time early in your taining.I know I'm an old guy but the A/c don't fly and diff.Get some good basic training...Have fun.
		I was doing a stall under the hood with the chief pilot in the right seat and the next 135 checkride victim was killing time in the back.
	forums.flightinfo.com /showthread.php?t=52977&page=2 (1117 words)

	Slow Flight and Stall Recognition - Flight Instruction (Site not responding. Last check: 2007-10-13)
		Therefore the theory of slow flight and stalls must be thoroughly understood prior to flight demonstrations.
		Slow flight on the edge of stall, with the stall warning buzzer screaming, teaches stall recognition.
		On the flboard illustrate why in a tight turn the angle of attack is greater on the upper wing, and therefore in a stall the aircraft tends to roll over the top in the opposite direction to the turn.
	godscopilot.com /_flight-04_CD.htm (266 words)

	Stall / Spin Training \| Mountain CFI (Site not responding. Last check: 2007-10-13)
		We had a discussion about stalls and spins and why understanding the nature of a spin was so important.
		He was flying a Cessna 210 and one of his comments was basically that he thought he would have to screw up pretty bad to enter a spin.
		full power-on stall during climb out, add a climbing turn that’s a little uncoordinated and you've got all the ingredients for a spin entry.
	mountaincfi.com /public/item/84496 (540 words)

	F-22 meets fourth of five 1999 DOD flight-test criteria (Site not responding. Last check: 2007-10-13)
		The milestone, combined with extensive, high angle-of-attack maneuvering, completed the fourth of five flight-test criteria established by DOD and the Air Force for 1999.
		A fifth requirement, flight in specific, high-speed regions of the F-22's envelope, is expected to be completed before the Defense Acquisition Board convenes in December.
		The DAB, chaired by Dr. Jaques Gansler, undersecretary of defense for acquisition and technology, will determine if the F-22 program is mature enough to move to the LRIP phase of building fighters that will be flown in the field by operational line pilots.
	www.fas.org /man/dod-101/sys/ac/docs/n19990901_991627.htm (531 words)

	An-24 had been ‘allowed to stall’ before its crash-01/11/2005-Flight International (Site not responding. Last check: 2007-10-13)
		MAK concludes that the An-24’s angle of attack exceeded the limit for stalling while the aircraft was on the final stages of its landing approach.
		“Deceleration of the aircraft to the stalling speed occurred as a result of the actions of the aircraft’s commander,” it says.
		MAK states that the crew failed to control the An-24’s speed and allowed it to remain in an inappropriate state of flight for an excessive period.
	www.flightinternational.com /Articles/2005/11/01/Navigation/186/202507/An-24+had+been+%e2%80%98allowed+to+stall%e2%80%99+before+its+crash.html (357 words)

	X-31 in flight, Herbst maneuver
		Two X-31 Enhanced Fighter Maneuverability (EFM) demonstrators were flown at the Rockwell International Palmdale, California, facility and the NASA Dryden Flight Research Center, Edwards, California, to obtain data that may apply to the design of highly-maneuverable next-generation fighters.
		The ARPA had requested flight research for the X-31 aircraft be moved there in February 1992.
		NASA was responsible for flight research operations, aircraft maintenance, and research engineering once the program moved to Dryden.
	www.dfrc.nasa.gov /Gallery/Movie/X-31/HTML/EM-0036-01.html (630 words)

	Pinnacle CRJ engines shut down after 41,000ft stall -16/11/2004-Flight International (Site not responding. Last check: 2007-10-13)
		An aerodynamic stall at 41,000ft (12,470m) was followed by the almost simultaneous shutdown of both engines on the Pinnacle Airlines Bombardier CRJ200 that crashed on 14 October in Jefferson City, Missouri, says the US National Transportation Safety Board (NTSB),
		Flight data recorder (FDR) information indicates that, at 41,000ft - the certificated service ceiling for the CRJ - the stick shaker and stick pusher activated several times before the aircraft stalled and the engines shut down, the NTSB says.
		The crew requested an altitude of 13,000ft after declaring an emergency at 41,000ft, and FDR data indicate the APU was on after the aerodynamic stall and the airspeed was sufficient for an APU start.
	www.flightinternational.com /FALANDING_190119.htm (343 words)

	2005 Dryden Highlights NASA Dryden Flight Research Center Edwards, California (Site not responding. Last check: 2007-10-13)
		With backing from Paul Bikle, then director of the Flight Research Center, Reed was a prime mover in development of the prototype lightweight M2-F1 Lifting Body that flew successfully in 1963.
		Reed also held a patent for his invention of a solar guidance system that is capable of steering an airplane by using the sun as reference.
		He authored the book "Wingless Flight" on the Lifting Body flight research program published by the NASA History Office in 1997 and republished later by the University Press of Kentucky.
	www.californiaspaceauthority.org /html/press-releasesandletters/pr050322.html (869 words)

	Prediction of Post-Stall Aerodynamic Characteristics of Maneuvering Aircraft (Site not responding. Last check: 2007-10-13)
		The approach is a direct coupling of fluid dynamics and flight mechanics for use in the flight regimes where the flow phenomena are dominated by vorticity and separation associated with high angles of attack and rapid motions.
		It can be used as a prediction capability for specified vehicle motions or flow conditions, or it can be coupled with a six-degree-of-freedom equation-of-motion solver to predict flight trajectories and transient performance characteristics.
		Post-stall flight regimes are handled with empirical correlations of wing data.
	www.nearinc.com /near/project/shaman.htm (235 words)

	Federal Aviation Regulation Sec. 23.203 - Turning flight and accelerated turning stalls.
		Turning flight and accelerated turning stalls must be demonstrated in tests as follows:
		Reduce speed by steadily and progressively tightening the turn with the elevator until the airplane is stalled, as defined in §23.201(b).
		(b) After the airplane has stalled, as defined in §23.201(b), it must be possible to regain wings level flight by normal use of the flight controls, but without increasing power and without --
	www.risingup.com /fars/info/part23-203-FAR.shtml (393 words)

	Stall Warning System (Site not responding. Last check: 2007-10-13)
		On some older aircraft, a small moveable flap located on the leading edge of the wing engages an electrical switch in the cabin, which activates a stall warning buzzer or horn.
		On some later aircraft, the system is pneumatic, with a small slot in the leading edge of the wing.
		Both types sense approach to stall, and sounds a device in the cabin, warning of impending stall.
	www.pilotfriend.com /flight_training/aircraft%20instruments/Stall%20Warning%20System.htm (108 words)

	CISI Group - Nonlinear Flight Dynamics: Tailplane Stall (Site not responding. Last check: 2007-10-13)
		The stall is precipitated by a flap extension during descent, similar to the Vickers Viscount accident at Bromma Airport in Stockholm, Sweden on January 15, 1977 [1].
		During the flap extension, the decrease in angle of attack causes an increase in hinge moment and a corresponding increase in stick force pulling the stick forward.
		In the case of the iced aircraft, this stick force overpowers the pilot and a catastrophic tailplane stall occurs.
	black.csl.uiuc.edu /~jmelody/icing/publications/NR-Jun00-anim/06Jun00.html (332 words)

	Answer To Flight Delays Won't Stall 3rd Airport (Daily Southtown)
		The World Gateway project at O'Hare International Airport was billed Wednesday as the antidote to flight delays and flier frustration.
		It should not be considered an attempt to halt efforts to build a third regional airport in south suburban Peotone, Chicago aviation officials said.
		Key to the deal was an increase to a ticket surcharge the city puts on departing and connecting flights at O'Hare and Midway.
	www.jessejacksonjr.org /issues/i1005001822.html (547 words)

	WebMuseum: Aertsen, Pieter: Butcher's Stall with the Flight into Egypt
		The latter, however, is not merely a pretext to justify the painting; it must be integral to the meaning of the scene.
		In the background to the left we see the Virgin on the Flight into Egypt dispensing charity to the faithful lined up for church, while to the right is the prodigal son in a tavern.
		Aertsen's Meat Stall was clearly a famous work in its own day, judging from the number of contemporary versions that exist.
	www.ibiblio.org /wm/paint/auth/aertsen/butchers-stall (690 words)

	"As airlines stall, airport expansion plans take flight"
		The world's second-largest airline, United, was forced into bankruptcy, and the largest, American, threatened to file for court protection.
		In San Francisco, politics, the financial devastation to airlines, and the concerns of environmentalists have stalled plans for two new runways, a project that would require filling in part of the bay.
		In Los Angeles, City Council members are urging a measured approach to a proposed $9 billion modernization project at Los Angeles International Airport.
	archives.californiaaviation.org /airport/msg27444.html (1070 words)

	Model of Unsteady Aerodynamic Coefficients of a Delta Wing Aircraft at High Angles of Attack - Storming Media
		Abstract: Studies on the subject of near-stall or post-stall flight have a direct impact on the evaluation of flight safety, on performance in terms of landing distance, and on increases in maneuverability.
		For several years, new flow control concepts have been studied, and some of them have proven effective in overcoming the difficulties (e.g., loss of control in yaw, asymmetry of forebody, roll instability) involving flight at high angles of attack.
		It is necessary to have a precise model of aerodynamic forces and moment to allow the design of efficient control laws and to evaluate the capabilities of a fighter in term of maneuverability.
	www.stormingmedia.us /83/8309/A830914.html (275 words)

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