WO2002047979A2 - Aircraft with elliptical winglets - Google Patents
Aircraft with elliptical winglets Download PDFInfo
- Publication number
- WO2002047979A2 WO2002047979A2 PCT/US2001/046703 US0146703W WO0247979A2 WO 2002047979 A2 WO2002047979 A2 WO 2002047979A2 US 0146703 W US0146703 W US 0146703W WO 0247979 A2 WO0247979 A2 WO 0247979A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- winglet
- wing
- outer end
- aircraft
- inner end
- Prior art date
Links
- 230000001154 acute effect Effects 0.000 claims description 5
- 230000007704 transition Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 3
- 235000009811 Momordica charantia Nutrition 0.000 description 1
- 244000302512 Momordica charantia Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C23/00—Influencing air flow over aircraft surfaces, not otherwise provided for
- B64C23/06—Influencing air flow over aircraft surfaces, not otherwise provided for by generating vortices
- B64C23/065—Influencing air flow over aircraft surfaces, not otherwise provided for by generating vortices at the wing tips
- B64C23/069—Influencing air flow over aircraft surfaces, not otherwise provided for by generating vortices at the wing tips using one or more wing tip airfoil devices, e.g. winglets, splines, wing tip fences or raked wingtips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/10—Drag reduction
Definitions
- This invention relates to winglets adapted to reduce the induced drag created by an aircraft's wings when they create lift. More particularly, it relates to the provision of a winglet that is continuously curved from where it joins the outer end of the wing out to its outer end or tip and the curvature at least closely approximates the curvature of a conical section, viz. has elliptical, parabolic or hyperbolic curvature.
- Lifting surfaces create drag when they create lift. This drag-due-to-lift is called "induced drag.” Aerodynamic theory shows that for essentially planar wings (wings that line essentially in the x-y plane) , that the induced drag is minimized if the lift on the wing is distributed elliptically along the span of the wing. That is, the lift per unit span as a function of spanwise position should vary elliptically, with the largest lift per unit span at the wing centerline, and with the lift per unit span gradually dropping in an elliptical manner as the tip is approached.
- winglets The purpose and operation of "winglets” is described in "Aerodynamics, Aeronautics and Flight Mechanics", by Barnes W. McCormick, and published 1979 by John Wiley & Sons, Inc. (pages 215-221) .
- Known winglet constructions in the patent literature are disclosed by United States Patents: No. 4,017,041, granted April 12, 1977 to Wilbur C. Nelson; No. 4,190,219, granted February 26, 1980, to James E. hackett; No. 4,205,810, granted June 3, 1980, to Kichio K. Ishimitsu; No. 4,240,597, granted December 23, 1990, to Roger R. Ellis, W. Martin Gertsen and Norman E. Conley; No.
- the aircraft (2) basically comprises an aircraft body (4), left and right wings (6), and a tail section (8).
- a winglet (10, 110) is shown at the outer end of each wing (6) .
- a coordinate system is defined for the aircraft (2) in the following manner.
- a longitudinal axis (x) is defined to extend through the center of the aircraft body (4) in the fore and aft directions.
- a vertical axis (z) is defined in the up and down directions
- a transverse axis (y) is defined in the left and right directions.
- the longitudinal axis (x) , vertical axis (z) and transverse axis (y) are orthogonal to each other and meet at an origin located at the foremost plane of the aircraft (2) .
- a winglet (16) which is generally trapezoidal in shape, is joined to the wingtip (12) so that the winglet (16) upwardly extends from the wing (6) .
- a strake is indicated by reference character (16a) in Fig. 2.
- the wing (12) (Fig. ' 2) has upper and lower wing surfaces (18) and
- the winglet (16) has upper and lower winglet surfaces
- the winglet (16) generally corresponds to the "inner” and “outer” directions, respectively. This convention will be followed herein.
- the winglet (16) is swept back at an angle ( ⁇ ) from the vertical z- axis at least equal to the sweep angle of the leading edges of the wings at the wing tip (14) relative to the transverse y-axis (Fig. 2).
- the winglet (16) is also canted at a cant angle from a plane parallel to the (x) and (y) axis (Fig. 3) .
- Two methods of defining the curvature of the aft portions of the air foils of the wing (12) and winglet (16) are set forth in U.S. Patent No. 5,275,358, commencing in column 4, at line 7, and continuing into column 5.
- Fig. 4 in the drawing is identical to Fig. 11 in U.S. Patent No. 5,275,358. It is prior art to the present invention and constitutes the invention of Patent No. 5,275,358.
- the tip of the wing (6) is designated (112).
- Point (114) is where the wing reference plane (148) intersects the winglet reference plane (150) .
- the winglet (116) is generally trapezoidal in shape. It extends upwardly from the wing tip (112) and the inner section (114) .
- the wing tip (112) has upper and lower wing surfaces (118 and 120), a wing leading edge (122) and a wing trailing edge.
- the winglet (116) has upper and lower winglet surfaces (126 and 128), a winglet leading edge (130), a winglet trailing edge and a winglet root.
- Fig. 4 has three primary features. Firstly, the aft portion of the upper wing and winglet surfaces (118 and 129) are flattened to prevent flow separation at the wing/winglet intersection (114) . Secondly, the wing and winglet leading edges (122 and 130) are drooped downwardly to prevent premature Shockwave development. Thirdly, the winglet (116) is not canted outwardly, so the wing bending moments are not substantially increased by the addition of the winglet (116) . These primary features and certain secondary features are described in detail in U.S. Patent No. 5,275,358.
- Fig. 5 of the drawing is identical to Fig. IB of U.S. Patent No. 5,348,253.
- a blended winglet is shown connected to a typical wing end portion (1) .
- the winglet chord equals the wing tip chord at the attachment line (3) .
- a transition section (2) is bounded by the transition line (3) and a chordwise line (4) designating the transition end of the winglet (9).
- the nearly planar outer portion of the winglet (9) is generally straight from the transition end (4) to the tip (5) .
- a first feature of the Fig. 5 wing/winglet arrangement is a continuous monotonic chord variation bounded by a leading edge curve and a trailing edge curve (8) .
- the leading edge curve (7) is selected to provide a smooth gradual chord variation in the transition and also, to limit the leading edge sweep angle to less than about 65°. This is necessary to avoid vortex shedding from the leading edge which would comprimse the surface loading and thereby increase drag.
- the shape of the trailing edge curve (8) is generally not critical but is selected to correspond to the airfoil chord and twist required to achieve optimum loading. This restriction will usually allow the wing and winglet trailing edges to lie in the same plane which is desirable functionally and esthetically .
- the second feature is a continuous monotonic variation of cant angle. It is stated that the rate of curvature R must be large enough to accommodate the chord variation in the transition section and allow the practical achievement of optimum aerodynamic loading and minimum interference between wing and winglet.
- h winglet height measured along a normal to the wing chord plane
- ⁇ 4 cant angle of the planar section
- the present invention includes the discovery that when winglets are attached to the wing tips, the minimum induced drag is obtained when the lift is distributed in a generally elliptical fashion both in the spanwise and vertical directions.
- the present invention utilizes winglets having a generally elliptical shape in the z-y plane, assuring that the wing loading closely approximates the ideal lift distribution. This results in minimum induced drag and reduced fuel consumption.
- the present invention also includes the discovery that the winglets will provide reduced induced drag when the winglets have a generally parabolic shape or a generally hyperbolic shape in the y-z plane.
- the present invention includes providing the wings of an aircraft with winglets of a unique curvature.
- Each wing has an inner end, an outer end, an upper surface, a lower surface, a leading edge and a trailing edge.
- Each winglet has an inner end, an outer end, an upper surface, a lower surface, a leading edge and a trailing edge.
- the inner end of each winglet is connected to the outer end of its wing.
- the upper and lower surfaces of the winglets and the leading and trailing edges of the winglets are continuations of the upper and lower surfaces of the wing and the leading and trailing edges of the wing.
- Each winglet follows a generally elliptical curve as it extends from its inner end out to its outer end.
- the generally and said elliptical curve has a major axis that extends substantially perpendicular to the wing reference plane and substantially intersects the location where the outer end of the wing is joined to the inner end of the winglet.
- the generally elliptical curve has a minor axis substantially perpendicular to the major axis, and that is spaced above the outer end of the winglet.
- the minor axis intersects the major axis at a center and a diagonal line extends from the center out to the outer end of the winglet and makes an acute angle of about forty-five to ninety (45°-90°) degrees with the major axis.
- the winglet at its outer end has a cant angle of substantially about forty-five to about ninety degrees (45°-90°).
- each wing has a dihedral angle of substantially about zero to fifteen degrees (0°-15°) .
- Fig. 1 is a pictorial view taken from above and looking towards the front, top and one side of an airplane that includes winglets on its wings, such view also constituting Fig. 1 of the aforementioned U.S. Patent No. 5,275,358;
- Fig. 2 is a cross sectional view taken through the right wing of Fig. 1, showing the main wing span in section and sending a side elevational view of a winglet, such view also constituting Fig. 2 of U.S. Patent No. 5,275,358;
- Fig. 3 is a fragmentary front elevational view of the winglet of Fig. 2 and enjoining portion of the main span of the wing, such view also constituting Fig. 4 of U.S. Patent No. 5,275,358;
- Fig. 4 is a view like Fig. 3, but of a different prior art winglet, such view also constituting Fig. 11 of U.S. Patent No. 5,275,358;
- Fig. 5 is a view like Figs. 3 and 4 but of yet another prior art winglet, such view also constituting Fig. IB of U.S. Patent No. 5,348,253;
- Fig. 6 is a view like Figs. 3-5, but of a winglet constructed in accordance with the present invention
- Fig. 7 is a fragmentary pictorial view of the winglet shown by fig. 6, looking towards its forward edge and lower surface;
- Fig. 8 is a top plan view of a wing for a MD-80 with winglets;
- Fig. 9 is a view that combines Figs. 5 and 6, such view showing the Fig. 5 winglet in broken lines and showing the Fig. 6 winglet in solid lines;
- Fig. 10 is a drawing of an ellipse taken from a geometry text;
- Fig. 11 is a drawing of a parabola taken from the same geometry text as Fig. 10;
- Fig. 12 is a drawing of a hyperbola taken from the same geometry text as Figs. 10 and 11;
- Fig. 13 is a graph plotting induced drag coefficient with lift coefficient
- Fig. 14 is a graph plotting percentage in reduction in induced drag versus lift coefficient showing the improvement obtained with the elliptical winglet in comparison to the prior art .
- Fig. 1 The aircraft shown by Fig. 1 includes winglets 10, 110 which are representative of both the prior art winglets and the winglets of the present invention.
- the prior art winglets shown by Figs. 2-5 have been described above.
- the winglets of the present invention will now be described with respect to Figs . 6- 11.
- Fig. 6 showing an embodiment of the invention, the outer end of the wing 200 meets the inner end of the winglet 202 at intersection 204.
- the major axis 206 of an ellipse is shown to extend perpendicular to the wing reference plane and to coincide with the intersection 204.
- the minor axis 208 of the ellipse extends perpendicular to the major axis and intersects the major axis at center 210.
- an acute angle 216 would be defined between the line 212 and the major axis 206.
- the dihedral angle of the wing 200 is designated 218.
- the winglet height is designated 220 and the winglet span is designated 222.
- the wing tip cant angle is designated 224.
- the winglet 202 curves upwardly and outwardly from intersection 204 to the outer end or tip 214 of the winglet 202.
- a cross sectional view taken at intersection 204 and looking outwardly towards the winglet 202 in elevation would look substantially like Fig. 2.
- the winglet 202 has a generally trapezoidal shape in side elevation (Fig. 7) and the leading edge makes an angle with a vertical line, as best shown in Fig. 2.
- the winglet 202 preferably has a curvature in the y-z plane that at least approximates a sector of an ellipse measured from intersection station 204 outwardly to the winglet outer end or tip 214.
- the curvature of the winglet surfaces meets the wing surfaces substantially at a tangent.
- the elliptical sector is identified in Fig. 10, between major axis 204 and point 214 representing the position of the winglet tip 214 on the ellipse.
- the wing 200 has a forward edge 226, a rearward or trailing edge 228, an upper surface 230 and a lower surface 233 (Fig. 6).
- the winglet 202 has a forward edge 232, a rearward edge 234, an upper surface 236 (Fig. 6) and a lower surface 238.
- the upper and lower surfaces 236, 238 of the winglet 202, and the leading and trailing edges 232, 234 of the winglet 202 are continuations of the upper and lower surfaces 230, 232 and the leading and trailing edges 226, 228 of the wing 200.
- the wing 200 has a sweep angle 201.
- the wingspan extending from the aircraft centerline C/L out to where the wing 200 meets the winglet 202 is designated WS .
- the span of the winglet is designated WS ' .
- the distance WS is smaller and the distance WS ' is larger than it is in the prior art aircraft. This results in reduced induced drag.
- the invention differs from all prior art winglet designs in two important aspects.
- the present design closely follows the ideal elliptical shape, while no prior winglet follows the ideal elliptical shape, or even attempts to approximate it.
- the other conic sections viz. a parabolic section and a hyperbolic section, include curves that approximate the ideal elliptical shape and thus they are included in the invention. These curves are shown by Figs. 11 and 12.
- Fig. 13 is a graph plotting induced drag coefficient with lift coefficient. This graph shows that the elliptical winglet of the present invention reduces induced drag on the MD-80 aircraft by ten percent (10%) . It is believed that a near elliptical curvature and parabolic and hyperbolic curvatures will also significantly reduce induced drag. Second, the present design is continuously curved in the y-z plane (front view) , while all prior winglets have an essentially planar winglet shape when viewed from the front, perhaps with a brief curved transition section between the wing and the winglet.
- the radius of curvature is at a minimum at 204 where the outer end of the wing 200 meets the inner end of the winglet 202.
- the radius of curvature progressively and continuously increases following generally at least a conical section curvature and preferably following an elliptical curvature.
- Fig. 14 The superior performance of the elliptical winglet design in comparison to the prior art is illustrated in Fig. 14.
- This figure shows the percentage reduction in induced drag obtained when an MD-80 aircraft is fitted with an elliptical winglet, and a winglet designed in conformance with Patent No. 5,348,253.
- the figure shows that the elliptical winglet reduces the MD-80 induced drag by approximately l A percent in comparison to the prior art.
- This A percent reduction in induced drag would result in an annual fuel cost savings of approximately $15,000 for an MD-80 in commercial airline service, based on a fuel cost of approximately $0.90 per gallon.
- This savings clearly illustrates the value of the elliptical winglet described in this patent.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2431488A CA2431488C (en) | 2000-12-11 | 2001-12-05 | Aircraft with elliptical winglets |
DE60126824T DE60126824T2 (en) | 2000-12-11 | 2001-12-05 | PLANE WITH ELLIPTIC WINGLETS |
EP01995382A EP1349778B1 (en) | 2000-12-11 | 2001-12-05 | Aircraft with elliptical winglets |
AU2002225941A AU2002225941A1 (en) | 2000-12-11 | 2001-12-05 | Aircraft with elliptical winglets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/734,347 | 2000-12-11 | ||
US09/734,347 US6484968B2 (en) | 2000-12-11 | 2000-12-11 | Aircraft with elliptical winglets |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002047979A2 true WO2002047979A2 (en) | 2002-06-20 |
WO2002047979A3 WO2002047979A3 (en) | 2002-12-12 |
Family
ID=24951310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/046703 WO2002047979A2 (en) | 2000-12-11 | 2001-12-05 | Aircraft with elliptical winglets |
Country Status (7)
Country | Link |
---|---|
US (1) | US6484968B2 (en) |
EP (1) | EP1349778B1 (en) |
AT (1) | ATE354517T1 (en) |
AU (1) | AU2002225941A1 (en) |
CA (1) | CA2431488C (en) |
DE (1) | DE60126824T2 (en) |
WO (1) | WO2002047979A2 (en) |
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WO2008061739A1 (en) | 2006-11-21 | 2008-05-29 | Airbus Deutschland Gmbh | Wing tip shape for a wing, in particular of aircraft |
WO2011127938A1 (en) | 2010-04-12 | 2011-10-20 | Airbus Operations Gmbh | Fixed wing of an aircraft |
US8241002B2 (en) | 2003-01-02 | 2012-08-14 | Aloys Wobben | Rotor blade for a wind power plant |
EP2905222A1 (en) * | 2008-06-20 | 2015-08-12 | Aviation Partners, Inc. | Curved wing tip |
US9302766B2 (en) | 2008-06-20 | 2016-04-05 | Aviation Partners, Inc. | Split blended winglet |
US9580170B2 (en) | 2011-06-09 | 2017-02-28 | Aviation Partners, Inc. | Split spiroid |
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US7644892B1 (en) * | 2006-07-06 | 2010-01-12 | Alford Jr Lionel D | Blended winglet |
US7744038B2 (en) * | 2007-06-15 | 2010-06-29 | The Boeing Company | Controllable winglets |
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US8128035B2 (en) * | 2008-04-15 | 2012-03-06 | The Boeing Company | Winglets with recessed surfaces, and associated systems and methods |
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CN102358417B (en) * | 2011-09-02 | 2013-09-18 | 北京航空航天大学 | Annular winglet of civil airliner wing |
GB201201609D0 (en) * | 2012-01-31 | 2012-03-14 | Airbus Operations Ltd | A wing fin of an aircraft |
US9103325B2 (en) | 2012-03-20 | 2015-08-11 | General Electric Company | Winglet for a wind turbine rotor blade |
US8936219B2 (en) | 2012-03-30 | 2015-01-20 | The Boeing Company | Performance-enhancing winglet system and method |
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KR101325593B1 (en) | 2013-05-03 | 2013-11-06 | 국방과학연구소 | Under water body with end-plate attatached to partially movable rudder |
US10562613B2 (en) * | 2013-12-04 | 2020-02-18 | Tamarack Aerospace Group, Inc. | Adjustable lift modification wingtip |
EP3077281A4 (en) | 2013-12-05 | 2017-07-26 | Tamarack Aerospace Group, Inc. | Wingtip device |
GB2522245A (en) * | 2014-01-20 | 2015-07-22 | Airbus Operations Ltd | A curved winglet |
US9511850B2 (en) | 2014-04-12 | 2016-12-06 | The Boeing Company | Wing tip device for an aircraft wing |
US9637225B1 (en) | 2015-11-16 | 2017-05-02 | Textron Innovations Inc. | Aircraft winglet |
US11148788B2 (en) | 2016-02-12 | 2021-10-19 | Textron Innovation, Inc. | Curved wingtip for aircraft |
EP3269635A1 (en) * | 2016-07-12 | 2018-01-17 | The Aircraft Performance Company UG | Airplane wing |
GB2559771A (en) * | 2017-02-17 | 2018-08-22 | Airbus Operations Ltd | A rib arrangement in a wing tip device |
GB2559968A (en) | 2017-02-22 | 2018-08-29 | Airbus Operations Ltd | A winglet and method of designing a winglet |
EP3511243B1 (en) * | 2018-01-15 | 2021-12-29 | The Aircraft Performance Company GmbH | Airplane wing |
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- 2000-12-11 US US09/734,347 patent/US6484968B2/en not_active Expired - Lifetime
-
2001
- 2001-12-05 AU AU2002225941A patent/AU2002225941A1/en not_active Abandoned
- 2001-12-05 AT AT01995382T patent/ATE354517T1/en not_active IP Right Cessation
- 2001-12-05 EP EP01995382A patent/EP1349778B1/en not_active Revoked
- 2001-12-05 DE DE60126824T patent/DE60126824T2/en not_active Expired - Lifetime
- 2001-12-05 CA CA2431488A patent/CA2431488C/en not_active Expired - Lifetime
- 2001-12-05 WO PCT/US2001/046703 patent/WO2002047979A2/en active IP Right Grant
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US8241002B2 (en) | 2003-01-02 | 2012-08-14 | Aloys Wobben | Rotor blade for a wind power plant |
WO2008061739A1 (en) | 2006-11-21 | 2008-05-29 | Airbus Deutschland Gmbh | Wing tip shape for a wing, in particular of aircraft |
JP2010510118A (en) * | 2006-11-21 | 2010-04-02 | エアバス・オペレーションズ・ゲーエムベーハー | Wing tip shape especially for aircraft wings |
US9550563B2 (en) | 2006-11-21 | 2017-01-24 | Airbus Operations Gmbh | Wing tip shape for a wing, in particular of aircraft |
US8727285B2 (en) | 2006-11-21 | 2014-05-20 | Airbus Operations Gmbh | Wing tip shape for a wing, in particular of aircraft |
US9381999B2 (en) | 2008-06-20 | 2016-07-05 | C. R. Bard, Inc. | Wing tip with optimum loading |
US10005546B2 (en) | 2008-06-20 | 2018-06-26 | Aviation Partners, Inc. | Split blended winglet |
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US9555874B2 (en) | 2010-04-12 | 2017-01-31 | Airbus Operations Gmbh | Fixed wing of an aircraft |
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US10106247B2 (en) | 2011-06-09 | 2018-10-23 | Aviation Partners, Inc. | Split blended winglet |
US9580170B2 (en) | 2011-06-09 | 2017-02-28 | Aviation Partners, Inc. | Split spiroid |
US10377472B2 (en) | 2011-06-09 | 2019-08-13 | Aviation Partners, Inc. | Wing tip with winglet and ventral fin |
US10787246B2 (en) | 2011-06-09 | 2020-09-29 | Aviation Partners, Inc. | Wing tip with winglet and ventral fin |
Also Published As
Publication number | Publication date |
---|---|
AU2002225941A1 (en) | 2002-06-24 |
US6484968B2 (en) | 2002-11-26 |
EP1349778B1 (en) | 2007-02-21 |
DE60126824D1 (en) | 2007-04-05 |
DE60126824T2 (en) | 2007-10-31 |
EP1349778A2 (en) | 2003-10-08 |
US20020092947A1 (en) | 2002-07-18 |
CA2431488C (en) | 2011-04-19 |
WO2002047979A3 (en) | 2002-12-12 |
EP1349778A4 (en) | 2006-06-07 |
ATE354517T1 (en) | 2007-03-15 |
CA2431488A1 (en) | 2002-06-20 |
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