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Topic: Leading edge extension

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	Aerospaceweb.org \| Ask Us - Wing Vortex Devices
		Leading edge notches and dogtooths, a more common name for a sawtooth, are both types of wing modifications.
		A notched leading edge and a dogtooth work in a similar manner to increase the speed of the flow over a portion of a wing and delay stall.
		The leading edge extension, dogtooth, and fences are particularly common on these planes since these devices increase the stall angle of attack and improve maneuverability.
	www.aerospaceweb.org /question/aerodynamics/q0228.shtml (981 words)

	Leading edge extension - Wikipedia, the free encyclopedia
		Leading edge extensions or LEX (also referred to as leading edge root extensions) are fillets added to the front of a modern fighter aircraft's wings in order to provide usable airflow at high angles of attack.
		They are typically roughly triangular in shape, running from the leading edge of the wing root to a point near the cockpit along the fuselage.
		In this case the purpose is to generate small vortices that ensure airflow over the control surfaces at high angles of attack, typically during takeoff and landing.
	en.wikipedia.org /wiki/Leading_edge_extension (276 words)

	TPWD: Aug. 24, 2005 Commission Meeting Agenda – Regulations Committee
		The leading edge is attached to the 6-1/2-mesh extension section and the rear edge is attached to the 23-mesh extension section.
		The circumference of the leading edge of the funnel is attached to the forward small-mesh section three meshes forward of the large-mesh escape section and is evenly sewn, mesh for mesh, to the small-mesh section.
		The leading edges of the trapezoidal panel must be 8 meshes wide and must be cut with all-bar cuts running parallel to each other, such that the length of the inner edge is 72 bars and the length of the outer edge is 89 bars and the resulting fore-and-aft edge is 8 meshes deep.
	www.tpwd.state.tx.us /business/feedback/meetings/2005/0825/agenda/regulations_committee (6674 words)

	Aerospaceweb.org \| Ask Us - F-18 Leading Edge Extension Fences
		To better understand the purpose of this fence and the leading edge extension, we first need to take a step back and discuss an aerodynamic device called the vortex generator.
		A leading edge extension is designed for the same purpose--to create a strong vortex that increases the stall angle of a wing.
		The high pressure air from the lower surface of the LEX rolls around the edge to the lower pressure region on the upper surface of the LEX.
	www.aerospaceweb.org /question/planes/q0176.shtml (1533 words)

	Focke-Wulf Fw 190 Main Landing Gear by Robert Stephenson and E. Brown Ryle III
		The reason the gear is located so close the wing leading edge is that it is in front of the main wing spar, which is the attachment point of the main landing gear.
		The wing’s leading edge extension at the wingroot and the wheelwell area through the fuselage allow the gear’s close position to the wing’s leading edge.
		As I mentioned, the close location of the gear to the wing’s leading edge, and the Fw190 wing’s taper toward the tip, moves the tire forward of the wing leading edge when the main gear is extended (Photo 2).
	www.clubhyper.com /reference/fw190landinggear_1.htm (1446 words)

	Leading edge extension -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-03)
		They are typically roughly triangular in shape, running from the leading edge of the wing to a point near the cockpit along the fuselage.
		These take the form of small fins sticking up from the surface of the wing just behind the leading edge.
		In this case the purpose is to generate smaller vortexes that keep airflow over the flight controls at the rear of the wing at high angles of attack, notably during takeoff and landing.
	www.absoluteastronomy.com /encyclopedia/l/le/leading_edge_extension.htm (230 words)

	Boat Design Forums - Keel design issues
		-that the leading edge of the root area to be quite sharp in comparison to the leading of the over all keel itself.
		So the leading edge is eliminated as much as possible and the flow is expected to split on to either side with minimal disturbance at low angles of attack (which is the operational condition).
		The idea of the dillet is to sort of build a ramp out ahead of the leading edge that channels the flow away from the body and opposes the flow moving toward the body along the leading edge.
	www.boatdesign.net /Forums/printthread.php?t=4874 (1611 words)

	RC Turkey Vulture - RC Bird-like Flight (Site not responding. Last check: 2007-11-03)
		The location of the leading edge of the MAC (from the reference line) is the chord-times-x sum divided by the chord sum.
		Using wax paper under the trailing edge, glue the aft ribs to the spar and to the trailing edge.
		With the leading edge flat on the table, glue the leading edge to the ribs.
	www.modelairplanenews.com /click_trips/jun02/turkey_vulture.asp (3688 words)

	The Aerodrome Forum - Neiuport 28 - Why Wing Problems?
		This probably could be corrected by full rib capstrips as it appears that the wings failed at the joint between the leading edge sheeting and the cap strips.
		The span from the leading edge to the front spar was wider than most wings.
		In a dive the cenmnter of pressure moved aft on the chord of the wing increasing the upward force on the leading edge of the wing.
	www.theaerodrome.com /forum/printthread.php?t=7966 (584 words)

	Cell Spreading and Lamellipodial Extension Rate Is Regulated by Membrane Tension -- Raucher and Sheetz 148 (1): 127 -- ...
		In each minute, the number of lamellipodial extensions (extending for longer than 25 s) was counted, normalized to total number of lamellipodial extensions during the 10 min before the addition of deoxycholate, and averaged for at least 20 cells.
		that is inversely correlated with the lamellipodial extension
		Bergman, J.E., Kupfer, A., Singer, S.J. Membrane insertion and at the leading edge of motile fibroblasts.
	www.jcb.org /cgi/content/full/148/1/127 (6080 words)

	Leading Edge Business Solutions : Data Warehousing, Business Intelligence, System Integration.
		Leading Edge have partnered with LogiXML Inc., a purely Web-based Business Intelligence (BI) provider, LogiXML helps a business achieve its goals and objectives by empowering all business users to access, analyse and share business information across the organization through managed reporting, OLAP analysis, and ad hoc queries according to corporate and individual needs.
		Leading Edge has further increased it's strength in the Teradata Professional Services marketplace with the addition of Simon Robinson to the team.
		Leading Edge CTO, Paul Johnson, explains the data temperature concept in an article for Conspectus.
	www.leadingedge.uk.com /company/news.html (271 words)

	172RG POH
		Conventional hinged ailerons and single-slot type flaps are attached to the trailing edge of the wings.
		The rudder is constructed of a formed leading edge skin containing hinge halves, a center wrap-around skin panel, ribs, an aft wrap-around skin panel which is joined at the trailing edge of the rudder by a filler strip.
		Construction of the elevator consists of formed leading edge skins, a forward spar, ribs, torque tube and bellcrank, left upper and lower "V" type corrugated skins, and right upper and lower "V" type corrugated skins incorporating a trailing edge cut-out for the trim tab.
	williams.best.vwh.net /172RG_POH/7-3.html (681 words)

	Boat Design Forums - Keel design issues
		My guess is that there is only a separation bouble near the keel leading edge and if you bump up the reynolds number the flow will be very nice and perpendicular to the keel leading edge further away from the hull.
		Near the trailing edge, the pressure inboard is higher than the pressure outboard of a given section and the flow turns in the outboard direciton.
		The separated region shown in the photo is due to the adverse pressure gradient in the wing boundary layer aft of the leading edge.
	www.boatdesign.net /forum/printthread.php?t=4874&pp=40 (5993 words)

	NASA - NASA Contributions to F/A-18E/F
		Redesigning the leading edge extension was the job of a 15-member national team of experts, which included three Langley engineers.
		This configuration is the wing leading edge extension on the production F/A-18E/F. The leading edge extension redesign effort is an example of the value that NASA provides as a center for national corporate knowledge in high-angle-of-attack technology and its application to solve major problems in the development of U.S. fighter/attack aircraft.
		Extensive testing of the F/A-18E/F with the redesigned leading edge extension was conducted in a variety of NASA and industry wind tunnels to completely define its aerodynamic characteristics.
	www.nasa.gov /centers/langley/news/factsheets/F-18.html (1573 words)

	F/A-18E/F "Super Hornet"
		As a result of these tests, a reassessment of the leading edge extension design was begun.
		Redesigning the leading edge extension was the job of a 15-member national team of experts, which included three Langley engineers.
		This configuration is the wing leading edge extension on the production F/A-18E/F. Roll-out of the first Super Hornet occurred in September 1995, and it flew for the first time in November 1995, ahead of schedule and nearly 1,000 pounds under specified weight.
	www.globalsecurity.org /military/systems/aircraft/f-18ef.htm (2460 words)

	VMA-231 - AV-8B Harrier II (Site not responding. Last check: 2007-11-03)
		Note the camouflage pattern extends down under the leading edge root extension onto the fuselage sides (not all aircraft have this.)
		A boarding ladder extends from under the lower intake/fuselage blend that is directly connected to the canopy, so when the canopy opens, the ladder extends.
		Note that the left and right steps have painted guide lines leading from the cockpit to steps while most of the other aircraft have lines for all three steps.
	www.geocities.com /mcaschpt/VMA-231-3.html (1137 words)

	manuel
		Important note: before starting the assembly, slide the leading edge foam stiffener in the pocket on the upper surface, on the leading edge.
		Assemble the two parts of the leading edge (203+203001B).
		Insert the leading edge tube in its hole and attach with its clevis pin (E5B).
	perso.wanadoo.fr /randkar_ulm/EGE.htm (191 words)

	Partners in Freedom
		Studies were also directed at cambering the leading edge of the LEX to suppress the vortex at low angles of attack, and thereby minimize drag at cruise conditions.
		The deflections of the wing leading- and trailing-edge flaps were increased and the ailerons were programmed to droop in low-speed flight to augment lift.
		McDonnell Douglas explored a number of configuration changes to satisfy these requirements, including adding a snag to the wing leading edge, reshaping the LEX, and using moveable spoilers on the upper surfaces of the LEX to ensure recovery from extreme angles of attack.
	oea.larc.nasa.gov /PAIS/Partners/FA_18.html (7756 words)

	MiG Alley -- MiG-29
		Multi-segment ramp system, including top-hinged forward door (containing a very large number of small holes) inside each intake that closes the duct while aircraft is taking off or landing, to prevent ingestion of foreign objects, ice or snow.
		Air is then fed to each engine through louvres in top of wingroot leading-edge extension and perforations in duct closure door.
		Hydraulic retraction and extension, with mechanical emergency release.
	www.hostultra.com /~migalley/mig29.html (623 words)

	1/48 Scale Sabre Wings - What's the Angle? by Jennings Heilig (Artwork, No Scale)
		Quite simply, a wing's chord is the distance from the leading edge to the trailing edge.
		If you understand that the '6-3' refers to the amount added to the leading edge; 6 inches at the root, and 3 inches at the tip, then you can see that this modification will affect the sweepback of the wing if we measure our 25% chord based on this unevenly extended leading edge.
		Remember that the 35 degree sweep of the wing was calculated on the original F-86 wing, long before the '6-3' leading edge extension had been dreamed up.
	www.clubhyper.com /reference/sabrewingsjh_1.htm (1092 words)

	F-18HARV EC89-0096-149: F-18 HARV smoke and tuft vortex flow visualization along leading edge extension
		F-18 HARV smoke and tuft vortex flow visualization along leading edge extension
		Flow visualization smoke marks vortex flows along the leading edge extension on an F/A-18 flown by NASA's Dryden Flight Research Center, Edwards, California, in its High Alpha Research Vehicle (HARV) program.
		The aircraft is at a high angle of attack in this photo.
	www.dfrc.nasa.gov /Gallery/photo/F-18HARV/HTML/EC89-0096-149.html (148 words)

	Skil Table Saw 3400 Review at Epinions.com
		The extension's leading edge is beveled to "catch and lift" stock that may sag slightly when it clears the rear edge of the deck.
		* The supplied single side wing extension (a piece of stamped aluminum) bolts either to the left or right side and provides nice extra support for long stock crosscuts and sheet dividing; but, because of the saw's vibration and the flimsy nut-'n'-bolt attachment to the deck, that wing just won't stay even with the deck.
		I noticed threaded holes machined into the sides of the deck, presumable for optional extension wings, but the supplied wing doesn't use them.
	www.epinions.com /content_24727424644 (912 words)

	Fleet E-959: NACA Aircraft in hangar 1953 - L-R: Three D-558-2s, D-558-1, B-47, wing of YF-84A, background are the X-4 ...
		This was one of a number of wing modifications, using different configurations of slats and/or wing fences, to ease the airplane's tendency to pitch-up.
		It is located at Edwards, Calif., on the western edge of the Mojave Desert, 80 miles north of Los Angeles.
		Dryden's history dates back to the early fall of 1946, when a group of five aeronautical engineers arrived at what is now Edwards from the NACA's Langley Memorial Aeronautical Laboratory, Hampton, Va. Their goal was to prepare for the X-l supersonic research flights in a joint NACA-U.S. Army Air Forces-Bell Aircraft Corp. program.
	www.dfrc.nasa.gov /Gallery/Photo/Fleet/HTML/E-959.html (810 words)

	Soviet Union/Russia Mig-29 Fighter (Site not responding. Last check: 2007-11-03)
		The aircraft wing had 3-D deformation and high-lift devices in the form of programmable leading and trailing edge flaps.
		Austere airfield operations on natural ground was included along with the traditional airfield methods by means of main intakes closing during taxi, takeoff, and landing roll.
		Mikoyan's First Deputy General Designer, Anatoly Belosvet, carries the lead on what is said to be Russia's "first stealthy combat aircraft", the Model 1.42 "ATF'ski", which is characterized as a "multi-functional front-line fighter" (mnogufunktsionalnny fronlovoi istrebitel).
	air.top81.cn /fighter/eng/mig29.htm (4441 words)

	HB-EGF promotes epithelial cell migration in eyelid development -- Mine et al. 132 (19): 4317 -- Development
		Contribution of leading edge formation and root formation to total eyelid formation was estimated as shown.
		was detected predominantly in the extending leading edge (Fig.
		in the leading edge is correlated with HB-EGF-mediated EGFR
	dev.biologists.org /cgi/content/full/132/19/4317 (5502 words)

	Strakes and Canards at Transonic Speeds (Site not responding. Last check: 2007-11-03)
		The strakes are one of those examples where the interference can be largely beneficial both from the aeodynamic point of view (lift) and control (effects on rolling and bending moments, see below).
		Similar effects can be achieved with a long leading edge extension (which makes a smooth wing-body combination).
		Vortex formation (and buffeting) on a wing is a direct consequence of the strakes.
	aerodyn.org /HighSpeed/strakes.html (148 words)

	The Scripps Research Institute - News and Views
		Scientists have for years sought the master regulators of cell motility—the molecules driving the process that have their hands on the steering wheels and feet on the gas pedals.
		When cells move, their movement is driven by the assembly and polymerization of actin at the leading edge of the cells and the myosin-mediated contraction in the tail of the cells.
		Bokoch and his colleagues found that Rac is spatially and temporally regulated to coordinate leading-edge extension and tail contraction during the "chemotactic" motility of human neutrophils.
	www.scripps.edu /newsandviews/e_20021216/onpress.html (485 words)

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