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Wednesday, May 6, 2020 | History

4 edition of Mechanical design of high lift systems for high aspect ratio swept wings found in the catalog.

Mechanical design of high lift systems for high aspect ratio swept wings

Mechanical design of high lift systems for high aspect ratio swept wings

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Published by National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Moffett Field, Calif, [Springfield, Va .
Written in English


Edition Notes

StatementPeter K.C. Rudolph.
Series[NASA contractor report] -- NASA/CR-1998-196709., NASA contractor report -- NASA CR-196709.
ContributionsAmes Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17595589M
OCLC/WorldCa41969370

A higher aspect ratio (given the same wing area) means more wing span and less lift-dependent drag. At the same angle of attack, higher aspect ratio also means more lift (within limits). Lift is produced by deflecting the oncoming stream of air downwards. The more air can be affected, the more efficient lift production becomes.   Swept back wings are for high speed flight. High spped is up to and above the speed of sound. What the definition is for high speed for an RC model is, I don't know. The best info I have read on the subject is from Martin Simons book, "Model Aircraft Aerodynamics". One advantage of sweep back is it slightly reduces the dihedral angle required.

As compared with a straight wing, the swept wing offers significant increases in cruising Mach number and, at the same time, permits the use of wings of sufficient thickness to allow aspect ratios high enough for good values of the maximum lift-drag ratio. The aspect ratio, sweep angle, airfoil thickness ratio, and wing weight necessary for. The thin, high-aspect-ratio swept wing of the B coupled with its long high-fineness-ratio fuselage contributed to the high aerodynamic efficiency of the aircraft.

  The GLEX has about square feet less wing area, so has a slightly higher aspect ratio. It has a very sophisticated high-lift slat and flap system, combined with a powerful rudder, the wing allows it to have low Vmcg and Vmca; thus low speed numbers in the take-off and landing regimes--about 15 knots less than the G at similar gross weights. The "historical gap" has been created by sheer size, speed, and weight differences in modern transport. Although the Hurel Dubois 34 features a high aspect wing, note it is also heavily cambered and designed for mph flight. A non starter. High aspect wings are very efficient, but their stall AOA is much lower than a low aspect wing.


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Mechanical design of high lift systems for high aspect ratio swept wings Download PDF EPUB FB2

Design of the high lift system for future subsonic airliners. This contractor is the third partner in this effort. His contribution is to start a mechanism design effort based on a common flap configuration.

Using his past industry experience in this field, the contractor has designed seven (7) different mechanisms for the common flap configuration.

Get this from a library. Mechanical design of high lift systems for high aspect ratio swept wings. [Peter K C Rudolph; Ames Research Center.]. Mechanical design of high lift systems for high aspect ratio swept wings [microform] / Peter K.C. Rudolph National Aeronautics and Space Administration, Ames Research Center ; National Technical Information Service, distributor Moffett Field, Calif.: [Springfield, Va Australian/Harvard Citation.

Rudolph, Peter K. & Ames Research Center. The NASA Ames Research Center is working to develop a methodology for the optimization and design of the high lift system for future subsonic airliners with the involvement of two by: 3.

Mechanical Design of High Lift Systems for High Aspect Ratio Swept Wings. For slat design, the options have been limited to mechanisms for a shallow leading edge slat. Three (3) different layouts are presented for maximum slat angles of 20 deg, 15 deg and 1O deg all mechanized with a rack and pinion drive similar to that on the Boeing Author: Peter K.

Rudolph. This is facilitated by high lift systems on the wing. Subsection will show what types of high lift system are used and the characteristics of the different versions.

Subsection deals with the approximate calculation of the maximum lift coefficients from the geometrical parameters, which are assumed to be known, of the high lift Size: 1MB. the unsteady nature of the flows over low-aspect-ratio wings is an important problem.

In fact, Pines and Bohorquez [10] list it as the first area that requires advancement for future development of MAVs. Relevant investigations have been performed on unsteady separated flow around wings undergoing translation [11,12]. During the wing design process, eighteen parameters must be determined.

They are as follows: 1. Wing reference (or planform) area (S W or S ref or S) 2. Number of the wings 3. Vertical position relative to the fuselage (high, mid, or low wing) 4. Horizontal position relative to the fuselage 5. Cross section (or airfoil) 6. Aspect ratio (AR) 7. wing loadings increased and a real need for high-lift devices emerged to keep takeoff and landing speeds within reasonable limits.

The high-lift devices of that era were generally trailing-edge flaps. When jet engines matured sufficiently in military service and were introduced commercially. The aerodynamic performance of low aspect ratio wings at low Reynolds numbers applicable to micro air vehicle design was studied in this thesis.

There is an overall lack of data for this low Reynolds number range, particularly concerning details of local flow behavior along the span.

Experiments were conducted to measure the localFile Size: 2MB. High-lift multi-element airfoils for low-aspect ratio wings with endplates find application in race car rear wings used to generate high aerodynamic down force.

Airfoils for such applications must not only generate maximum lift (to maximize the down force) but also must satisfy several geometric constraints imposed by the race Size: KB. A new methodology has been developed that integrates the preliminary wing design with trailing edge high-lift systems and accounts for three-dimensional flap kinematics.

The high-lift system in the developed application includes the kinematic synthesis of four common mechanisms (dropped-hinge, four-bar, link-track and hooked-track) and a preliminary actuation by: 2.

Mechanical design for high lift systems for high aspect ratio swept wings Some excerpts, to check what the solutions were for the " The U.C. Davis team had selected the simple hinge, the Boeing upside down/upright four bar linkage, and the Airbus A link/track mechanism as their candidates for.

airfoils. The aerodynamic features of high-lift and mild-stall have been realized. Introduction Since the first manned flight a hundred years before, the main goals of flying have long been faster, higher and farer, so as the wings of different aspect ratio and swept angle equipped with conventional, high lift.

You know that the air accelerates as it travels over the top of a wing - it's a basic part of Bernoulli's lift. So, if you're flying near the speed of sound - say Mach.8, the air flowing over the wing could speed up to Mach 1.

Now you have supersonic flow. Your critical Mach number is the speed where air flowing over the wing first reaches Mach 1. • The wedge shaped lower fuselage and drooped wingtips could slow the airstream and generate compression lift at high Mach.

Lockheed-Martin Z-wing () morphing design 9. Wing Sweeping • An airplane wing that may be swept back and then returned to. A design study for a supersonic business jet with high aspect ratio moderately swept wings, equipped with high lift devices over most of the hinge, a heavier high lift system and a high effective aspect ratio will lead to a wing which will be much heavier per unit area.

Mechanical. The NASA Ames Research Center is working to develop a methodology for the optimization and design of the high lift system for future subsonic airliners with.

High-Lift Low Reynolds Number Airfoil Design. Aerodynamic Characteristics of Conventional and Innovative High Lift Swept Wings. 22 May | Journal of Bionic Engineering, Vol.

16, No. Design of high-lift airfoils for low aspect ratio wings with by: Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of Guidance, Control, and Dynamics; Aerodynamics of high-lift, low-aspect-ratio unswept wings.

Joseph Katz ; Joseph Katz. San Diego State University, San Diego, by:. High aspect ratio wings are seen on sailplanes, and the best of these deliver lift to drag ratios of more than 60 to 1. A degree sweep pure delta wing has an aspect ratio of ~, compared to a sailplane which might have an aspect ration of 30, or a typical airliner, which might have an aspect ratio of Maximum lift drag ratio for wings of a fixed aspect ratio in comparison with actual wings with high lift devices.

LEADING EDGE SLAT. The slat, figure 1, Chapter V, is used on many swept wing airplanes to prevent stall on the leading edge.Generally, the maximum lift of high-aspect-ratio wings at subsonic speeds is directly related to the maximum lift of the wing section or airfoil.

According to the DATCOM, the wing planform shape influences the maximum lift obtainable, although its effect is less important than that of the airfoil’s section characteristics.