Some aerodynamic considerations for advanced aircraft configurations

Williams, L. J.; Johnson, Joseph L.; Yip, L. P.

doi:10.2514/6.1984-562

Cited by 6 publications

(1 citation statement)

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“…It is a common problem for T-tail configurations where the turbulent wake from the stalled main wing blankets the tailplane and elevator, making pitch control inert. It can also be encountered in certain situations on other aircraft configurations with a rearwards centre of mass, and on canard configurations where the aft wing stalls, forcing the aircraft to pitch up and push the canard into stall (7) . A similar process between an F-16's wing and strakes would lead it to deep stall between 50 and 60°degrees angle-of-attack (8) Figure 2 illustrates that in a stall the aircraft becomes longitudinally unstable (where the gradient of the C m -α plot becomes positive).…”

Section: Deep Stallingmentioning

confidence: 99%

Fixed-wing approach techniques for complex environments

Thomas¹,

Bullock

Bhandari³

et al. 2015

Aeronaut. j.

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The landing approach for fixed-wing small unmanned air vehicles (SUAVs) in complex environments such as urban canyons, wooded areas, or any other obscured terrain is challenging due to the limited distance available for conventional glide slope descents. Alternative approach methods, such as deep stall and spin techniques, are beneficial for such environments but are less conventional and would benefit from further qualitative and quantitative understanding to improve their implementation. Flight tests of such techniques, with a representative remotely piloted vehicle, have been carried out for this purpose and the results are presented in this paper. Trajectories and flight data for a range of approach techniques are presented and conclusions are drawn as to the potential benefits and issues of using such techniques for SUAV landings. In particular, the stability of the vehicle on entry to a deep stall was noticeably improved through the use of symmetric inboard flaps (crow brakes). Spiral descent profiles investigated, including spin descents, produced faster descent rates and further reduced landing space requirements. However, sufficient control authority was maintainable in a spiral stall descent, whereas it was compromised in a full spin.

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Section: Deep Stallingmentioning

confidence: 99%

Fixed-wing approach techniques for complex environments

Thomas¹,

Bullock

Bhandari³

et al. 2015

Aeronaut. j.

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High Angle-of-Attack Aerodynamics

Erickson¹

1995

Annu. Rev. Fluid Mech.

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The mission of AGARD is to bring together the leading personalities of the NATO nations in the fields of science and technology relating to aerospace for the following purposes:-Exchanging of scientific and technical information; --Continuously stimulating advances in the aerospace sciences relevant to strengthening the common defence posture;-mproving the co-operation among member nations in aerospace research and development;-Providirg scientific and technical advice and assistance to the North Atlantic Military Committee in the field of aerospace research and development;-Rendering acientific and technical assistance, as requested, to other NATO bodies and to member nations in connection with research and development problems in the aerospace field;-Providing assistance to member nations for the purpose of increasing their scientific and technical potential;--Recommending effective ways for the member nations to use their research and development capabilities for the common benefit of the NATO commun'The highest authority within AGARD is the National Delegates Board consisting of officially appointed senior representatives from each member nation. The mission of AGARD is carried out through the Panels which are composed of experts appointed by the National Delegates, the Consultant and Exchange Programme and the Aerospace Applications Studies Programme. The results of AGARD work are reported to the member flations and the NATO Authorities through the AGARD series of publications of which this is one.Participation in AGARD activities is by invitation only and is normally limited to citizens of the NATO nations.The content of this publication has been reproduced directly from material supplied by AGARD or the authors. Published January 1979 Copyright © AGARD 1979All Rights Reserved ISBN 92-835-0230-2 Printed by Technical Editing and Reproduction LtdHarford House, 7-9 Charlotte St, London, WJP JHD . . ,.....• MMUl., FOREWORDThe Symposium was organised at this time because of the continuing need for design data and principles relevant to the flight of aircraft and missiles at high angles of attack and because of the substantial effort that had been devoted over recent years to the development of aircraft and missiles capablc i controlled flight at high angles of attack.Aerodynamics spans the behaviour of air vehicles and the behaviour of fluids. At high angles of attack, we need dynamic stability parameters to describe the behaviour of air vehicles and we need an understanding of separated flow, usually highly 3-dimensional and often unsteady, to describe the behaviour of the air. The Symposium made it clear that the present state of knowledge in the area of high angle-of-attack aerodynamics is descriptive of the dynamics of the vehicle and of the fluid, despite the needs of the designer for rational methods of prediction.The Round Table Discussion included pleas for attention to a large number of problems and principles, some of which are mentioned below.(a) Well-designed experiments, in which theoretical ideas ...

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Stability and control of a three-surface, forward-swept wing configuration

Owens

Perkins

1996

Journal of Aircraft

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Some aerodynamic considerations for advanced aircraft configurations

Cited by 6 publications

References 0 publications

Fixed-wing approach techniques for complex environments

Fixed-wing approach techniques for complex environments

High Angle-of-Attack Aerodynamics

Stability and control of a three-surface, forward-swept wing configuration

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