GB2203714A - Tandem wing aircraft - Google Patents
Tandem wing aircraft Download PDFInfo
- Publication number
- GB2203714A GB2203714A GB08804792A GB8804792A GB2203714A GB 2203714 A GB2203714 A GB 2203714A GB 08804792 A GB08804792 A GB 08804792A GB 8804792 A GB8804792 A GB 8804792A GB 2203714 A GB2203714 A GB 2203714A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aircraft
- aftplane
- accordance
- wing
- anhedral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C39/00—Aircraft not otherwise provided for
- B64C39/06—Aircraft not otherwise provided for having disc- or ring-shaped wings
- B64C39/068—Aircraft not otherwise provided for having disc- or ring-shaped wings having multiple wings joined at the tips
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Tires In General (AREA)
Abstract
An aircraft has a fuselage (1) with a foreplane (2) mounted above the fuselage and having a swept back anhedral configuration. An aftplane (3) is mounted below the fuselage and has an inboard cranked portion (4) of an anhedral configuration and an outboard portion (5) of dihedral configuration. The outboard portion (5) at least is forwardly swept. The respective wing tips are further connected through articulated linkages (13).
Description
An Improved Aircraft
This invention relates to an improved aircraft and is an improvement in and modification to the aircraft disclosed and claimed in British Patent 2011848.
In accordance with one aspect of this invention there is provided an aircraft having swept back anhedral foreplane and forward swept aftplane, the outboard sections thereof forming a dihedral.
Preferably the aftplane has inboard sections which in combination with the outboard sections thereof form a cranked wing. In an advantageous embodiment the inboard sections of the aftplane have an anhedral configuration.
In accordance with another aspect of this invention, not essentially in combination with the aforesaid aspect, there is provided an aircraft having a swept back anhedral foreplane and a forward swept aftplane of which outboard sections at least thereof form a dihedral, tb.
wing tips of the foreplane being connected to the wing tips of the aftplane through an articulated linkage.
With an embodiment constructed in accordance with the first aspect of this invention the aftplane when cranked using an inboard anhedral portion provides lateral surfaces which can be used for directional, i.e.
yaw, control of the aircraft. Such surfaces may incorporate movable control surfaces forming effectively a rudder for directional control with the outboard sections of the aftplane having further movable surfaces forming aileron/elevator control.
When the aftplane is formed as a cranked wing with inboard anhedral and outboard dihedral surfaces, the juncture between said surfaces forming the crank serves as a location for mounting an engine. The underside portion at the crank also serves for supporting an undercarriage.
In a preferred embodiment incorporating the articulated linkage between the foreplane and aftplane wing tips a further advantage accrues in that performance is augmented as the aftplane is prevented from twisting. The wing tips themselves may be connected through a strut member forming part of the linkage.
The invention is now further described and illustrated with reference to the accompanying drwings showing one embodiment by way of an example only.
In the drawings:
Figure 1 shows a plan view of an aircraft
constructed in accordance with the
invention,
Figure 2 shows a side elevation,
Figure 3 shows a rear perspective view, and
Figure 4 shows diagrammatically an articulated
linkage joining the wing tips.
In this invention and with particular reference to the preferred embodiment to be described, an aircraft is provided having no tail fin as such but employing a cranked forward swept wing as the main lifting surface in which the anhedral central section is intended to provide directional control and stability. The forward swept wing is linked at or near the tips to a swept back canard foreplane by means of an articulated strut.
As shown in Figures 1 to 3 of the drawings, an aircraft has a fuselage 1 with a foreplane 2 mounted above the fuselage and having a swept back anhedral configuration. An aftplane 3 is mounted below the fuselage and has an inboard cranked portion 4 of an anhedral configuration and an outboard portion 5 of dihedral configuration. The outboard portion 5 at least is forwardly swept.
High speed aileron control surfaces 6 may be provided on the trailing edge of the foreplane.
The cranked portion 4 at the inboard section of the aftplane may include rudder control surfaces 7 and the dihedral outboard portions 5 of the aftplane may include an aileron/elevator control surface 8 together with augmentary low speed aileron control surfaces 9.
As shown in Figures 2 and 3, within the angle of the crank between the inboard aftplane section 4 and the outboard section 5 are provided propulsion engines 10 mounted on the fuselage or mounted on the wing and the underside of the crank may include an undercarriage 11 being either fixed or retractable. A nose wheel undercarriage 12 is provided at the forward end of the fuselage 1.
The foreplane and aftplane wing tips are connected through a strut member 13 which is articulated to allow wing flexing in the vertical plane. The strut also permits the canard foreplane incidence to be varied in flight and the torsional tendency of the forward swept wing will at the same time be suppressed by the articulated strut which is secured in a system of bearings or bushes in a wing tip reinforcing member.
A diagrammatic example of the articulated wing tip strut is shown in figure 4 wherein the end of the foreplane 2 includes a universal joint or spherical bearing 14 bolted to a wing tip reinforcing member and carrying a titanium tubular strut 15 which has the other end secured in bearings 16 on the tip of the aftplane outboard wing portion 5. The bearings 16 allow pivotal movement about a generally longitudinally extending axis whereas the bearing 14 allows universal movement. This arrangement reduces or minimises torsional effects occurring in the forward swept wing and in practice a fairing will be provided covering the actual tubular strut member 15 shown in the drawings.
The arrangement provides an efficient wing having low weight and cost and in addition there is inherent stability in roll and yaw. Stability is a problem associated with a forward swept wing which is otherwise of high efficiency.
Although a connection is shown and described between the tips of the foreplane and aftplane the primary requirement is for the wing tips to be separated and held at a constant distance apart'in order to minimise aerodynamic interference. In the embodiment shown this distance is maintained by means of a streamlined articulated strut which permits restricted vertical aerodynamic fiexing of the wings.
Claims (11)
1. An aircraft having swept back anhedral foreplane and forward swept aftplane, the outboard sections thereof forming a dihedral.
2. An aircraft in accordance with Claim 1, wherein the aftplane has inboard sections which in combination with the outboard sections thereof form a cranked wing.
3. An aircraft in accordance with Claim 1 or 2, wherein the inboard sections of the aftplane have an anhedral configuration.
4. An aircraft in accordance with Claim 3, wherein the inboard anhedral portion provides lateral surfaces which can be used for directional, i.e. yaw, control of the aircraft.
5. An aircraft in accordance with claim 4, wherein said surface.; incorporate movable control surfaces firming effectively a rudder for directional control with the outboard sections of the aftplane having further movable surfaces forming aileron/elevator control.
6. An aircraft in accordance with any preceding claim 3 to 5, wherein the aftplane is formed as a cranked wing with inboard anhedral and outboard dihedral surfaces, the juncture between said surfaces forming the crank serving as a location for mounting an engine.
7. An aircraft in accordance with any preceding claim 3 to 6, wherein the underside portion at the crank serves for supporting an undercarriage.
8. An aircraft in accordance with any preceding claim wherein the wing tips of the foreplane are connected to the wing tips of the aftplane through an articulated linkage.
9. An aircraft having a swept back anhedral foreplane and a forward swept aftplane of which outboard sections at least thereof form a dihedral, the wing tips of the foreplane are connected to the wing tips of the aftplane through an articulated linkage.
10. An aircraft in accordance with any preceding claim, wherein the outboard sections at least of the aftplane are forward swept.
11. An aircraft constructed and having an aerodynamic wing configuration substantially as described herein and exemplified by the drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB878704942A GB8704942D0 (en) | 1987-03-03 | 1987-03-03 | Aircraft |
GB878707261A GB8707261D0 (en) | 1987-03-26 | 1987-03-26 | Aircraft |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8804792D0 GB8804792D0 (en) | 1988-03-30 |
GB2203714A true GB2203714A (en) | 1988-10-26 |
GB2203714B GB2203714B (en) | 1991-07-03 |
Family
ID=26291970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8804792A Expired - Lifetime GB2203714B (en) | 1987-03-03 | 1988-03-01 | An improved aircraft |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0348410A1 (en) |
GB (1) | GB2203714B (en) |
WO (1) | WO1988006551A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2208112B (en) * | 1987-06-26 | 1991-04-17 | Skywardens Limited | An aircraft with paired aerofoils |
US7841559B1 (en) | 2006-02-16 | 2010-11-30 | Mbda Incorporated | Aerial vehicle with variable aspect ratio deployable wings |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0716978B1 (en) * | 1994-12-16 | 2002-03-20 | Aldo Frediani | Large dimension aircraft |
US6098923A (en) * | 1998-03-13 | 2000-08-08 | Lockheed Martin Corporation | Aircraft structure to improve directional stability |
DE19952024A1 (en) * | 1999-10-28 | 2001-05-17 | Schardt Friedrich | Aircraft landing wheels are fitted to the under side of a rear horizontal stabilizer fitted below the fuselage for short take-off and landing conditions |
US10899447B2 (en) * | 2014-09-25 | 2021-01-26 | Andras Hernadi | Methods for improvements of the box wing aircraft concept and corresponding aircraft configuration |
WO2020040671A1 (en) | 2018-08-19 | 2020-02-27 | Hernadi Andras | Methods for improvements of the closed wing aircraft concept and corresponding aircraft configurations |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB949679A (en) * | 1959-08-26 | 1964-02-19 | Davide Velli | Air and sea transport craft |
GB2011848A (en) * | 1977-10-05 | 1979-07-18 | Hall E B | Hang-Glider |
US4336913A (en) * | 1979-10-02 | 1982-06-29 | Hall Eric B | Compound wing aircraft |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2557065A1 (en) * | 1983-12-22 | 1985-06-28 | Nguyen Manh Khanh | Aerodyne with polyhedral wing unit |
GB8715073D0 (en) * | 1987-06-26 | 1987-08-05 | Skywardens Ltd | Aircraft twin-wing configuration |
-
1988
- 1988-03-01 GB GB8804792A patent/GB2203714B/en not_active Expired - Lifetime
- 1988-03-01 EP EP19880901899 patent/EP0348410A1/en not_active Withdrawn
- 1988-03-01 WO PCT/GB1988/000146 patent/WO1988006551A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB949679A (en) * | 1959-08-26 | 1964-02-19 | Davide Velli | Air and sea transport craft |
GB2011848A (en) * | 1977-10-05 | 1979-07-18 | Hall E B | Hang-Glider |
US4336913A (en) * | 1979-10-02 | 1982-06-29 | Hall Eric B | Compound wing aircraft |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2208112B (en) * | 1987-06-26 | 1991-04-17 | Skywardens Limited | An aircraft with paired aerofoils |
US7841559B1 (en) | 2006-02-16 | 2010-11-30 | Mbda Incorporated | Aerial vehicle with variable aspect ratio deployable wings |
Also Published As
Publication number | Publication date |
---|---|
GB2203714B (en) | 1991-07-03 |
WO1988006551A1 (en) | 1988-09-07 |
GB8804792D0 (en) | 1988-03-30 |
EP0348410A1 (en) | 1990-01-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940301 |