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Meissner- Ochsenfeld based extendable wings for operational range increase

IP.com Disclosure Number: IPCOM000247258D
Publication Date: 2016-Aug-18
Document File: 15 page(s) / 1M

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Meissner Ochsenfeld: IP.COM


A solution to the technical problem is to provide a device and method for the efficient high lift by extendable wings based on the Meissner-Ochsenfeld effect to replace bulky and heavy mechanical/hydraulic actuation for folding/telescopic extension. For overview of the state of the art for Meissner-Ochsenfeld effect see Appendix 1. The basics of this solution are summarized as follows: • Tailored track for sets of couples of magnets and cryostats • Stopper inside wing box that can handle force from magnets and cryostats • Extendable wing sections, and attached cryostats and adjacent electro magnets arranged in a linear motor form • Series of magnets and cryostats, connect pair wise to each other attached inside the wing covers to replace ribs • Cryostats to be cooled to a temperature just below the step temperature of the super conducting material block inside them. • Electro-magnets wired to wing extension control system so their power can be controlled • Increasing electro magnet power will extend the wing section by pushing it along the linear motor • The extended wings will hereby provide improved high lift and the operational range can be significantly extended

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Meissner- Ochsenfeld based extendable wings for operational range increase


Aerospace Structures; Airframe, Wing, actuation, High-lift surfaces


Civil aircraft need a considerable amount of high lift provided by the wing surfaces. It would be desirable to design sufficiently large wings in order to maximize this requirement. However, in practice the size of the wings must be limited due to several factors;
-space on ground; short range aircraft have limited "boxes" at the gates, into which their size must fit
-space in hangars
-width of runways and taxiways
-maneuverability goes down if the wing gets too long

Historical examples are given as follows:

In the mid-1930s the British Air Ministry called for tender regarding first heavy bomber aircraft. However, the specified hangar width was still determined by medium bomber wing span. Thus first heavy bomber designs such as Avro Manchester (wing span 27 m), suffered from insufficient high lift, See Fig. 1.

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Repeated test flights confirmed the problem and various ideas suggested to improve the high lift resulted in that the only efficient means would be to extend the wing span. The result was that the wing span limitations were scrapped and immediately much more efficient designs were possible, such as the Avro Lancaster, see Fig. 2, for which the wing span could be increased to 31 m and additionally the two large inefficient engines were replaced with four smaller.

During WWII increased use of carriers required the US Navy to introduce "foldable wings", example Grumman Hellcat. Since then reconnaissance aircraft of the US Navy has always foldable wings, which Grumman has developed into perfection, see e.g. Grumman Tracker, Fig. 3, serving in several derivatives from the 1950s through the 1990s.

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A modern successor with turbofan engines is represented by the Grumman Viking, see Fig. 4. They both rely however on a heavy and very complicated mechanical system including hydraulics, which is too expensive and too complex for use in commercial aviation.

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Proposals exist in the literature for telescopically extendable wings, that operate in several steps. These are typically operated mechanically with hydraulic power. The ribs constitute a problems, since there cannot be any ribs in the sections through which the telescopically movable wing sections are moving.

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One proposed solution to this is external ribs i.e. that run outside the wing profile, see Fig. 5. Such ribs are not particularly efficient and disturb the aerodynamic flow.

Several airframe developers have considered extendable wings for commercial aircraft, mainly based on a folding mechanism. One example is the foldable wing for Sukhoi 860, see Fig. 6. This aircraft has not entered into series production.

Another example is the attempt by Boeing to offer 10 feet foldable wing tips on the 777X, see Fig. 7. It...