Questions tagged [wing-sweep]
Angle of a line from root to tip, 25% of the way back from the leading edge, measured from the perpendicular to the longitudinal axis of the aircraft.
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What are the effects of a corrugated surface on spanwise flow deviation, for a swept back flying wing?
Considering a Ju-52 wing in some hypothetical swept back flying wing configuration using the same strucural design as the Ju-52.
What would be the effects of that corrugated skin, regarding spanwise ...
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Is it feasible for an individual with limited current knowledge to undertake the development of an aircraft from scratch? [closed]
The world of aircraft engineering is truly remarkable, and even the smallest components involve a wealth of knowledge. I'm eager to explore this field and embark on the journey of building an aircraft....
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How do swept back wings delay shock wave
Swept back wings can delay the formation of shock wave and increase the aircraft critical mach number of the aircraft, right? But how
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Spanwise location of mean aerodynamic chord for Swept Wing
How would I calculate the spanwise location of the mean aerodynamic chord for a swept wing?
I see a general formula for an elliptical planform wing, but having trouble finding anything on swept wings.
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How does wing sweep impact lift? [duplicate]
Given that swept wings (according to a google search) decrease lift, how much is lift affected? Why are they so commonly used in aircraft nowadays, like the SU-27, and subsonic aircraft like the ...
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Literature request for effect of Aspect Ratio and Wing Sweep on critical angle of attack?
So I'm trying to find academic literature detailing how both aspect ratio and taper ratio affect the critical angle attack of an aerofoil - namely for a v. low AR wing (AR<1), and high sweep (~75 ...
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Impact to lift curve slope for a tapered wing with only trailing edge sweep?
I'd like to use a tapered wing with 0 deg leading edge sweep and 12 deg trailing edge sweep as shown below for my RC model. I understand that lift curve slope, a, is reduced for wings with leading-...
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Why do most canards have swept wings?
So most canards have swept back wings. Now I have been told that it is that way to ensure yaw stability (for example in a crosswind) - not sure though.
But then I look at the new Lilium jet, which is ...
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How do the orientation of spars and ribs affect the aerodynamic efficiency of wing?
There are various ways the ribs and spars can be oriented in the swept wing. Do the placement of ribs and spars affect the aerodynamics? And, what are the structural advantages of both orientations ...
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How would I draw the Max Thickness Sweep Angle on a wing from a Top View?
I have the Max Thickness Sweep Angle, Wing Tip and Root Chord Length, and Max Thickness to Chord Ratio defined. However, I am having trouble drawing the Max Thickness Sweep Angle on the wing because I'...
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Comparisons between the A340 and 747-200 wing: sweep angle and span
Here is a picture of the wings of the A340 (launched in the late 1980s) and the Boeing 747-200/400 (launched in the early 1970s / 80s) superimposed upon each other (source: https://www.amazon.com/...
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Taper sweep angle
Is the Taper sweep angle the same as the sweep angle?
So I know that the sweep angle is the angle from the vertical line from the leading edge to leading edge wing line.
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How does forward sweep of a wing affect the formation of shock waves?
I understand that sweeping a wing back reduces the component of velocity perpendicular to the wing and can allow it to travel at subsonic conditions, and reduce the formation of shock waves, even if ...
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Does the quarter-chord-angle rule still hold for wings with very long chords or large differences between leading- and trailing-edge sweep angles?
For most fixed-wing aircraft, the effective wing-sweep angle (i.e., the angle that the aircraft aerodynamically behaves like its wings are swept at) is equal to the angle of the quarter-chord line (...
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Why is sweep angle measured at the 25% chord?
If you look at wing planforms of e.g. the Spitfire, you can see that the sweep measured at the 25% chord line is 0°.
However, the leading edge is rounded/slightly swept and therefore induces spanwise ...
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If sweep delays compressibility, why does 747 cruise slower than A380?
B747 has a sweep angle of 37 deg and A380 has a sweep angle of 33 deg. If the main reason for sweep is to delay compressibility effects and increase operating Mach number, why does B747 cruise at a ...
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What is the purpose of the fin sweep on small piston airplanes? [duplicate]
Why some small piston airplanes, like Cessna 152/172, Tecnam P2008 and many more, have the vertical stabilizer with a sweepback? I don't think that those airplanes may encounter compressibility ...
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Swept back wing theory
I'm a beginner in airfoil design. I just came across swept-back wings. There is a point that I couldn't understand that theory.
Why is the only perpendicular component of the airflow to the wing(...
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What characteristic my canard needs to have when the canard also carries a pair of engine?
I am in 3rd year Aerospace Engineering and trying to do a preliminary design of an airplane. My design has a front wing that also has an engine at its root on both side of the fuselage.
There is ...
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How does one calculate the Mean Geometric Chord in extended Trapezoid Wing?
The general formula to calulate MGC of a wing is given for a trapezoid in many books but there isn't an example showing how to calculate it for a wing shaped like the one below. I tried to solve ...
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Difference in lift generation for a swept wing and straight wing in subsonic condition
Would there be any differences in lift for a straight wing and swept wing (front or back) with the same airfoil cross section, same chord length, same wing span, and same area when flying in subsonic ...
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How does a variable-sweep-wing aircraft keep wing-mounted payloads straight?
So, a variable-sweep wing is an interesting design, but I am wondering: if the aircraft wing moves back or forward, then the payload's angle will also change. Is there a another rotating mechanism in ...
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Can wing sweep decrease total drag force at low-subsonic speeds?
From experience everybody knows if you put your arm out of car window at high speed(150km/h), it's a lot easier to hold arm angled backward then hold arm straight out(prependicular to airlfow).So ...
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Why do semitailless swept-winged aircraft, but not delta-winged aircraft, suffer from (primarily) pitch oscillations at high mach?
Semitailless1 swept-wing aircraft without active stability enhancement2 generally3 have extremely poor handling characteristics, most notably a tendency towards violent pitch oscillations at high ...
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How ribs angle change wing overall shape? [closed]
How ribs angle change wing overall shape?
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Why doesn't a wing in supersonic flow produce a shock that results in flow parallel to the leading edge?
When we look at a wedge in supersonic flow, a shock emanates from the leading edge such that the flow after the shock is turned and is parallel to the airfoil surface.
The shock angle is based on the ...
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Does an increase in lift always cause an increase in lift-induced drag?
An increase in lift causes an increase in drag. Is it always true? I am confused with two points.
Lift increases with an increase in airspeed but induced drag reduces with an increase in airspeed.
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Could an arrow planform be better for a supersonic aircraft than a delta? Why?
From this review paper
Page 11:
Strut-bracing for the SST allows very significant reductions in both vortex and wave DDL via an extreme arrow configuration and could be favourable to LFC via reduced ...
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For aircraft with variable-sweep wings, how unstable is it to have each wing in a different position?
Wikipedia presents this photograph of an F-14 Tomcat, with one variable-sweep wing swept forward and the other back:
I was surprised to see that this configuration was possible; much less feasible or ...
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Tapered Wing Providing low Coefficient of Lift
Hi I am currently analyzing different wing designs using ANSYS Fluent.
One of my designs has a straight leading edge but a swept trailing edge thus it is tapered with wing root chord at 50mm and wing ...
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Why do swept wings decrease the drag increase that occurs in transonic flows?
Swept wings are used in aircraft that fly in the transonic regime because they 1) delay the critical Mach number 2) reduce the drag increase that occurs (smaller drag divergence).
I am trying to ...
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Is airflow deflected inwards or outwards by wing sweep?
We are often told that wing sweep causes the airflow to be deflected outwards. I can understand this for the underside, but for the upper surface it seems inconsistent with other effects.
For example ...
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Why don't commercial airliners use variable sweep wings? [duplicate]
I know they're not used in military aircraft because it decreases the stealth factor, but why don't commercial plane manufacturers make variable sweep planes?
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How do I choose the correct params?
I am very new to airplane design. I am working on this project to design a flying wing glider (no propeller) that would glide in a circular pattern with a fixed radius of 250 m after being released at ...
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How do I factor sweep and dihedral in the lift equation?
I'm guessing that you add cos(angle of dihedral) to calculate lift loss by dihedral, but I'm not sure how to factor in the lift loss by the wing swept. Could someone help me include lift loss due to ...
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Why don't commercial aircraft have variable sweep wings? [duplicate]
I was wondering why commercial aircraft don't have variable sweep wings just like the Bell X-5 did? By sweeping the wing further at high altitude it helps the aircraft move faster and also it helps ...
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How does gust affect a swept wing
I have a basic question that I cannot seem to find a solid answer for:
How does a gust affect a swept wing?
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What were the typical rotation and landing speeds of the X-29?
Looking online through all the available literature, I could not find the typical rotation ($V_r$), landing or even stall speed of the experimental forward swept wing X-29 aircraft.
I'm curious to ...
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Jettisonable wingspan for early long-range airplanes
Reading this question, I was wondering if, at some point early in aviation history there may have been designs or concepts anticipating variable swept wing by "expendable wingspan wing"?
For ...
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Why does the effective alpha/CL increase at wingtip of swept wing?
If anybody could explain this in an intuitive way I'd really appreciate it. I haven't been able to find a clear answer on this. I understand that the increase in effective AoA/CL and the spanwise flow ...
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Why are Vertical tails generally tapered?
I'm just intrigued to know why the vertical tail of a majority of aircraft is tapered? Is it due to aerodynamics, structural design or due to some instrumentation or multiple other reasons?
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Would throttle steering of a forward-swept-winged aircraft be possible?
Fortunately (or perhaps unfortunately, given the number of crashes that had to occur for us to figure it out), the use of throttle manipulation to control an airliner with disabled primary flight ...
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Why does wing bending cause wingtip twisting?
(semanticscholar.org)
When aft swept wings bend/flex, the outer wing is twisted leading edge (LE) down (this reduces wave drag), the reverse (LE up) is true for forward swept wings.
I've searched ...
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Is some sweep beneficial with taper?
I'm developing a canard glider which requires some taper for the canard to stall first. I understand that sweep is typically only for aircraft in a compressible airflow (M >= 0.3), but is there any ...
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How is the change of moment handled in a Weight and Balance calculation with a swept wing aircraft?
I'm writing a weight and balance calculator for a charter operation.
Every aircraft I've ever flight planned for has all the tanks on the same moment arm, so I don't know how you calculate the W&...
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How can the F-15 and Su-27 achieve a high top speed without variable wing geometry?
I watched a documentary once that explained, I believe, how the Su-27 and similar aircraft such as the F-15, can achieve a high top speed without variable wing geometry.
How does this work? How do ...
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Straight Wings VS Delta Wings, Variable wing with Forward swept capability [duplicate]
What are the Pros and Cons (Advantages and Disadvantages) of a Delta wing and a Straight wing against each other, and if a Variable wing with a capability to become a Forward Swept wing is even ...
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Where is the wing sweep angle measured from?
If you look at a 747 planform wing you see something like this:
In several aerodynamics and aircraft design text books they use the wing sweep angle as an important parameter to measure the wing ...
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Why do some airplanes have simultaneously a straight wing and a swept horizontal stabilizer?
I'm sure there are many other examples like this one: Embraer EMB 120 with an almost straight wing and an obviously swept horizontal stabilizer.
Why is there a difference in sweep angle between the ...
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Can the divergence Mach be greater than 1?
I know that by decreasing t/c and increasing the sweep angle it is possible to increase the divergence Mach, but what is the limit?
I am calculating the Mach for a wing with a quarter chord sweep ...
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