Delta-wing - Factbites

Delta-wing - Factbites
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Topic: Delta-wing

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	Delta wing - Wikipedia, the free encyclopedia
		The primary advantage of the delta wing design is that the wing's leading edge remains behind the shock wave generated by the nose of the aircraft when flying at supersonic speeds, which is an improvement on traditional wing designs.
		While this is also true of highly swept wings, the delta's planform carries across the entire aircraft, allowing it to be built much more strongly than a swept wing, where the spar meets the fuselage far in front of the center of gravity.
		Another advantage is that as the angle of attack increases the leading edge of the wing generates a vortex which remains attached to the upper surface of the wing, giving the delta a very high stall angle.
	en.wikipedia.org /wiki/Delta_wing (934 words)

	Aerodynamics of the Delta Wing
		Flows past delta wings are severely compounded by the leading edge separation, by the roll-up structure of the concentrated vortices, and by the lateral and longitudinal instability that is consequent to large sweeps, high-angle of attack, and sharp manoeuvres.
		Delta wings are appropriate plan forms to fly at supersonic and hypersonic speeds, therefore there has been a long time interest in investigating the effects of high Mach numbers.
		Delta wings (Deltas) are symmetrical triangular wings designed to fly at subsonic or supersonic speeds.
	aerodyn.org /Wings/delta.html (1300 words)

	48755.990930&ELEMENT_SET=DECL
		On demand the delta flaps are deployed at a position that is a function of the angle of attack of the wing and the aerodynamic state of the airplane.
		The delta flap is normally in a deactivated position with the upper surface of the flap substantially forming a continuation of the upper surface of the wing.
		The kinetic energy is collected by the delta flap from the flow outside the boundary layer of the aircraft wing (free stream flow) using the special properties of a thin delta wing with sharp leading edges.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/48755.990930&ELEMENT_SET=DECL (3861 words)

	Convair XF-92 - Wikipedia, the free encyclopedia
		The delta wing's large area of 425 square feet (39 m²), thin airfoil cross section, low weight, and structural strength made this a great combination for a supersonic airplane (although the fuselage was of a pre-area rule design).
		The basic layout was very similar to the Miles M.52 design, although the M.52 did not use a delta wing.
		Research from the XF-92A test program was used in the development of Convair's two later delta-winged interceptors, the F-102 Delta Dagger and the F-106 Delta Dart, as well as Convair's B-58 Hustler bomber.
	en.wikipedia.org /wiki/Xf-92 (598 words)

	Dictionary : Wing_types
		The tip of a delta wing is often, but not always, cut off.
		The Delta Dagger had a delta wing design.
		Dihedral is the angle at which the wings are slanted upward from the root of the wing (where it is attached to the fuselage) to the wing tip.
	www.centennialofflight.gov /essay/Dictionary/wing_types/DI98.htm (327 words)

	Aerodynamics, Wings for All Speeds
		At constant aircraft length this means that the wing gets shorter, partially because of the aspect-ratio and partially because of the back sweep and the change of geometry (delta wing, instead of a rectangular wing).
		Wings with variable in-flight sweep have been proposed for a long time, sometimes they have also been developed (exclusively for fighter aircraft), but they pose challenging problems, such as the shift in the aerodynamic center, with consequences to the whole aircraft stability.
		As a general rule, a wing aft-sweep of less 30 degrees is required at subsonic speeds, and a sweep of 50 to 60 degrees is appropriate for supersonic cruise.
	aerodyn.org /Wings/wings.html (916 words)

	Basic Delta Types
		On the left is a "standard delta," with wing tips and root on the same straight line, while the one on the right has an "extended keel." Both kites have long center spines, but only the red one has the wing fabric coming all the way down to the end.
		Some of the wing area is removed, or "clipped," from the wing tips, but the fronts of the wing spars and the position of the spreader are still determined by the virtual delta within.
		For a standard wing with a keel extension the spars and spreader position are the same as on a standard delta.
	www.deltas.freeserve.co.uk /types.html (4725 words)

	CONCORDE SST : DELTA WING
		On a delta wing at low speeds, such a vortex is formed nearly enough along the entire wing surface and produces most of the lift in those conditions.
		The "slender delta" wing on Concorde has the appearance of total simplicity.
		On the wing of a traditional subsonic aircraft there may be well over 50 moveable devices, including those for control and trim of the aircraft and the often complex flaps and leading edge slats for the generation of additional lift at slower speeds.
	www.concordesst.com /wing.html (665 words)

	CASE Lab Research: Delta Wing Experimental Data
		The geometry for this test was a slender delta wing with 80° leading edge sweep, a root chord of 16 5/8 inches, a total wing span of 5 7/8 inches measured at the base of the delta wing, and a thickness of 1/4 inch.
		This page presents a set of steady experimental data pertaining to an 80° delta wing at a pitch angle of 30° and various static roll angles.
		The following plots show surface pressure distributions on the upper and lower surfaces of the delta wing for various roll angles.
	www.caselab.okstate.edu /research/experiment/delta80.html (213 words)

	Delta Wings
		To counter the disadvantages of delta wings, modern aircraft are often fitted with canards, small stabilizing airfoils, or strakes, that encourage the formation of vortices across the wing roof of the delta.
		It used the same thin, simple delta wing as the F-102, but the fuselage was completely refined to incorporate a J-57 engine with twice the power, and the engine air intakes were moved farther aft for increased efficiency.
		To achieve the best supersonic flight performance possible from the delta shape, wings are made thin with sharp leading edges to decrease wave drag, which is the increase in air pressure and resistance against the entire airframe as it forces its way through transonically compressed air.
	www.airspacemag.com /ASM/Mag/Supp/DJ04/Deltas.html (1876 words)

	XF-92A Dart
		Delta wings have great rigidity and can be built thin, but still retain great internal volume for a large fuel supply.
		One approach to low-drag wings was the use of delta shaped planforms with a highly swept leading edge and a low thickness ratio.
		Besides validating the thin delta wing principle, the XF-92A played a major role in supporting the development of the Convair F-102A interceptor, the Air Force’s first attempt at an all-weather, supersonic interceptor.
	www.globalsecurity.org /military/systems/aircraft/f-92.htm (821 words)

	BTE - About the Delta Vortex
		Deltas really came into their own during the early days of R/C pylon racing, when there was an open class for any type of design.
		Deltas don't like to stall, so snaps and spins with a delta are different, but spectacular, in their own way.
		Because deltas are a naturally "clean" configuration, they enjoyed a lot of success in the speed-driven world of pylon racing.
	www.btemodels.com /vor_info.html (1094 words)

	Wing
		When the Mirage 2000 was introduced many commentators poured scorn on the delta wing, believing that the aircraft would suffer the same deficiencies as the similarly configured Mirage 3 and the ground attack Mirage 5 -and having inherited the Mirage name probably didn´t help.
		The F16 wing is actually a cropped delta but a conventional tailplane is still used for pitch control.
		The European love affair with the delta has been an enduring one.
	www.mirage-jet.com /AIRFRAME/Wing/wing.htm (369 words)

	AE6031W96list1
		As a delta wing of aspect ratio 2 rolls at Mach 2, at a "sting angle" of 35 degrees, plot the variation of normal Mach number on its leeward and windward leading edges from a roll angle of -90 degrees to +90 degrees.
		List the parameters which are important in determining the time-dependent lift coefficient of a sharp-edged delta wing, which is free to roll about a sting mount whose axis coincides with the root chord of the wing.
		A delta wing with 60-degree apex angle has 2m root chord.
	www.adl.gatech.edu /classes/unstaero/qns/qnlist2.html (913 words)

	USAF Museum - Convair TF-102A "Delta Dagger"
		The airplane is characterized by a large 60-degree delta wing and the absence of a conventional empennage.
		The delta wing is equipped with "elevons" which provide combination aileron and elevator action from conventional cockpit controls.
		The Case XX wing may be distinguished from the wing on earlier airplanes (Case X wing) by the droop at the wing-tip.
	www.wpafb.af.mil /museum/research/fighter/tf102.htm (376 words)

	Supersonic Flow
		delta wing has the advantage of a large sweep angle but also greater wing area than a simple swept wing to compensate for the loss of lift usually experienced in sweepback.
		A delta wing has the advantage of a large sweep angle but also greater wing area than a simple swept wing to compensate for the loss of lift usually experienced in sweepback.
		The aircraft manufacturer Lockheed chose to go with a fixed-wing delta design; whereas another aircraft company, Boeing, initially chose a swing-wing design.
	www.centennialofflight.gov /essay/Theories_of_Flight/supersonic_flow/TH22.htm (1485 words)

	Title page for ETD
		The effect of cavity flaps on the flow over a delta wing was documented for steady angles of attack in the range 28 degrees to 42 degrees by flow visualization and surface pressure measurements at a Reynolds number of 470,000 and 1,000,000, respectfully.
		The effect of continuously deployed cavity flaps during a dynamic pitch-up maneuver of a delta wing on the surface pressure distribution were recorded for a reduced frequency of 0.0089 and a Reynolds number of 1,300,000.
		The quality of the flow over a 75 degree-sweep delta wing was documented for steady angles of attack and during dynamic maneuvers with and without the use of two control surfaces.
	scholar.lib.vt.edu /theses/public/etd-32498-21232/etd-title.html (519 words)

	Low Speed Aerodynamics Research Group - Analysis of Delta Wing Flows
		The three-dimensional stalling process on the delta wing was quite different from those on the other two wings which exhibited a complex interaction between the dynamic stall vortex and the tip vortices.
		The basic delta wing used in the test programme was machined from a solid block of aluminium.
		The wing had a flat leeward surface, a highly contoured windward surface, (giving a thickness ratio of 9.0%) and bevelled edges on the windward side to produce sharp leading and trailing edges.
	www.aero.gla.ac.uk /Research/LowSpeedAero/delta.htm (428 words)

	Dantec. Application. PIV measurements on delta wing with periodic blowing and suction
		The mechanism by which periodic blowing and suction improves lift and stall angle of a 70 degree sweep delta wing is investigated in water tunnel experiments using PIV measurements.
		A Kodak Megaplus ES 1.0 CCD camera (1000 x 1000 pixel resolution) was mounted downstream of the delta wing, to visualize the flow in a plane perpendicular to the model suction surface (Figure 2).
		PIV Measurements on a Delta Wing with Periodic Blowing and Suction
	www.dantecmt.dk /applications/Aerospace/piv_USairforce (581 words)

	Concorde supersonique jet / Engineering / Features / Delta wing
		As a result of the delta shape, the wings would be efficient for supersonic flight and also provide enough lift to allow the Concorde to land at a speed of 177 miles per hours.
		Yet the delta wing also requires steeper angles of descent when landing.
		A delta shape is the most appropriate for supersonic flight, which requires a combination of sufficient lenght and sweep, minimum relative thickness, and a low aspect ratio.
	www.concorde-jet.com /e_aile_delta.htm (422 words)

	Computational Test Cases for Oscillating Clipped Delta Wing
		One of the consequences of increasing the relative thickness of a clipped delta wing is that transonic effects are enhanced for mach numbers near one; these effects are significantly stronger than would be the case for the thinner supersonic-transport wing.
		To facilitate pressure instrumentation, the thickness of the wing was increased to 6 percent of chord, as compared with 2.5 to 3 percent for the supersonic transport.
		In addition, a shock develops over the aft portion of the wing at transonic speeds such that at some angles of attack, there is both a leading-edge vortex and a shock wave on the wing.
	www.nasatech.com /Briefs/Sept02/L17822.html (421 words)

	Vortex flow on wings with highly swept leading edges
		Actually, on a delta wing, there is no distinct tip vortex, the LEV starts near the nose of the airplane and runs along the top surface to the tip, where it is dumped overboard just like a regular tip vortex.
		These strakes are basically small deltas with sharp LEs attached to the LE of the main wing at the root.
		For a more detailed discussion of the flow about a delta see "Aerodynamics of the Delta Wing".
	www.acsol.net /~nmasters/vortex-lift/delta.html (684 words)

	Delta Wing Streak 130
		It was the most advanced Delta Wing hang glider yet built but the design embodied nothing new.
		Delta Wing Kites and Gliders could no longer compete and the company went out of business.
		The large amount of lower wing area under cover, and the shaped leading edge made the Streak one of the fastest hang gliders of its day.
	www.nasm.si.edu /research/aero/aircraft/delta_wing_streak.htm (457 words)

	Question about delta wing (under camber) - RC Groups
		Delta wing is no tail plane, the distant between the wing and reflex is very short, is it mean the reflex can't function so well as plane with long tail?
		This is a 1/4" foam delta sloper, with the first 30% of the leading edge installed to generate "undercamber".
		An undercambered profile will fly as a delta.
	www.rcgroups.com /forums/showthread.php?t=143186 (610 words)

	What is a delta?
		Light wind deltas are made from lightweight non-porous spinnaker fabric, with light wind towing points, to maximize the force applied to the kite by light winds.
		In the same way they're incorrectly associated in peoples' minds with Rogallo wings, someone somewhere usurped the name "delta" to describe rigid, A-framed stunter kites.
		Deltas with different shapes and varying degrees of pull have been developed for flying in a wide range of different winds.
	www.deltas.freeserve.co.uk /whatsadelta.html (2289 words)

	China's Fighters - Chengdu J-10
		These small "wings" at the root of the leading edge of the main wing (not necessarily a delta wing anymore) remain out of airflow in cruise flight and are used during high AOA maneuvers to generate a high-speed vortex that stays attached to the top of the main wing (Bernoulli principle).
		In this configuration a small highly swept delta wing is added in front of the main wing for reduced drag at low speeds.
		A three-way diagram of the J-10 depicting a compound delta wing
	www.aeronautics.ru /news/news002/news095.htm (1038 words)

	Delta Wing Model 162
		The Delta Wing kites were also popular attractions in water-ski shows at marine theme parks, and at airshows.
		The leading edges formed a delta wing with a relatively narrow convergence angle of 80 degrees.
		Nothing is known about the flight history of this particular Delta Wing Model 162.
	www.nasm.si.edu /research/aero/aircraft/delta_wing_162.htm (1198 words)

	JGRC Aggressor Radio Control Delta Flying Wing
		Before reaching the opposite wing tip, it loops forward and enters the center of the wing where it is attached to the receiver.
		Additionally, I have only built one flying wing and it was a disaster of my own design, so this would be a step away from the usual for me.
		One of the plates took the place of the balsa doubler under the wing and the other went on the top of the wing.
	www.airfieldmodels.com /gallery_of_models/rc/jgrc_aggressor (2386 words)

	Delta Kites
		Delta kites weren't designed for those tough, thrill-seeking types who like to jump out of helicopters while the rest of us are sleeping.
		No, the delta is for people who appreciate its simplicity, forgiving personality and effortless handling.
		Add a windsock or tail, tie it off to a sturdy log and dive into that picnic basket you had the forsight to bring along.
	www.catchthewind.com /kites/delta_kites.html (88 words)

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