Questions tagged [ailerons]

Ailerons are the control surfaces on the wing that provide roll control.

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3answers
107 views

What are typical control surface deflections?

How can I tell what a reasonable control surface deflection is? For example, is a 10 deg aileron deflection reasonable? Or a 0.5 degree aileron deflection? Is that too little? Too much? Same ...
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1answer
369 views

How do the actuator loads (e.g. for the ailerons) vary between different flight phases?

Assume the hinge moment is given as $HM = 0.5\rho v^2*C_{h\delta} \delta*S*c$ $\rho$ = air density $v$ = air speed $C_{h\delta}$ = Hinge moment coefficient $S$ = Control surface area $c$ = ...
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1answer
402 views

Are there roll control devices other than ailerons?

With the little that I've learnt about aeroplanes, I know that the aileron is the control surface that a pilot use to roll the plane by decreasing the lift of one wing and increasing the lift of the ...
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1answer
174 views

Why were the ailerons of the Fokker Dr. I (Red Baron) located on the top wing?

Photos' source are here: Fokker Dr. I (Red Baron), and here: a Sopwith triplane. They are probably not the actual airplane but only (claimed) authentic models. It makes sense to me that the Sopwith ...
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1answer
400 views

What is the difference between an aileron and a flap?

I have already been searching Google for the difference between an aileron and a flap, but I am not much satisfied, so now I am asking here on SE. What is the difference between an aileron and flap? ...
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2answers
175 views

Could vortex generators be used to preserve aileron authority during a stall?

I know that using aileron input in the approach to a stall is generally inadvisable; what if vortex generators are placed at the wingtip (where the ailerons sit), meaning that the ailerons will still ...
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2answers
260 views

For a small flying wing, can two motors with different speeds replace the ailerons?

I was thinking about a way to get rid of the aileron, and I was wondering if: I install two motors on the wing, and make the right one spin faster than the left one, will my wing roll to the left ?
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1answer
532 views

Why does the A320’s maximum allowable aileron deflection decrease, rather than increase, when the flaps are extended?

According to this answer to why the A320 uses mainly spoilerons for roll control during landing, rather than conventional ailerons, the ailerons can’t extend as far when the flaps are extended, for ...
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1answer
358 views

Testing control surfaces pre flight; what feedback does pilot recieve?

During taxi / pre-take off I see a lot of commercial airliners test the deflections of their various control surfaces like the rudder, ailerons etc. What's the feedback received in this operation i....
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0answers
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Why did Curtiss put his Model F's ailerons on the interplane struts?

Glenn Curtiss's 1912-1918 Model F biplane flying boat has large ailerons on the struts between the wings, not contiguous with any other flying surface. Did this aileron position have any advantage? ...
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3answers
589 views

Why are trailing-edge control surfaces usually split?

I've noticed on many military and commercial jets, the trailing edge control surfaces (ailerons and flaps) are separate from each other. Why is this? Can't both serve the same function? It would save ...
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4answers
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Does the rudder need to be held throughout a coordinated turn?

It's widely known that to perform a coordinated turn, rudder must be turned as well as ailerons. My question is what to do after the desired bank angle is achieved? In the Airplane Flying Handbook we ...
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3answers
473 views

Disadvantages of using thrust vectoring only in an aircraft with variable rotation nacelles such as the X-19

Take a quad tilt rotor aircraft such as the curtiss-wright X-19 or even a bi-tilt aircraft such as the V-22. What would be the advantages or disadvantages of using thrust vectoring only for control ...
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1answer
444 views

Why only the outboard (“low speed”) aileron drops when there is no hydraulic pressure on the 747-8?

As the title says, why only the outboard ("low speed") aileron drops when there is no hydraulic pressure on the 748? (Full resolution)
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3answers
731 views

Do ailerons on opposite wings move together?

It seems nicely symmetrical that opposite ailerons would be locked togther, so that when the left wing's ailerons move up, those on the right wing would move down, by the same amount and at the same ...
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2answers
192 views

What are the scale effects of GA wing tip airfoils?

[ update: I am adopting an improved description provided by Peter Kämpf: "...only looking at the airfoils in isolation..." ] The goal of this question is to determine if wing tip airfoil scale plays ...
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3answers
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Why is there a difference between aileron upwards and downwards deflection angles?

I have noticed that on airliners the ailerons have different angles if deflecting upwards than deflecting downwards. When deflected at the maximum angle maximum angle downwards is lower than when ...
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1answer
1k views

How should control surfaces be modeled in simulations?

I am modeling the lift and drag forces of a wing in software of my own creation. If I have a wing which fits the profile of (for example) NACA 0024, it is a simple operation to look up the proper ...
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3answers
2k views

When is aileron trim used?

There is an aileron trimmer in some Boeings. When and why should it be used? P.S. I'm not a pilot, can you answer with less smart words?
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1answer
4k views

How can I calculate the rolling moment of an aileron for a given plane based on its performance?

Let's say I have an already-built airplane with known basic characteristics like weight, wing span and wing surface, and I can measure the time of all possible manoeuvres at different speeds. How ...
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1answer
578 views

How much do aileron on a commercial airliner move for manoeuvring and trim?

I recently flew on an MD88 and had a good view of the aircraft's wing from my seat (read: I sat right next to the toilet). During the flight I noticed a couple odd things about the ailerons on the ...
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8answers
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Why is using opposite rudder and aileron necessary in left turn for coordination?

This question goes against everything I've read or heard with the exception of a suggestion from my CFI in my last flight lesson, so I was hoping to get some clarification: During a left turn into ...
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2answers
3k views

Is roll control achieved exclusively with spoilers on an A320 on final approach?

As a private pilot I have zero knowledge about how big jets are being flown so I was a little surprised to see that smaller Airbuses (A32x) only use spoilers for roll control on final approach. ...
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1answer
299 views

What's the relationship between aileron deflection and roll moment?

I'm wanting to build a laterals-only kinematic model in MATLAB considering only the ailerons for control inputs and was wondering if anyone has a rough guideline for the relationship between their ...
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2answers
5k views

Are the functions of ailerons and rudder similar?

The ailerons help the plane to bank left/right by increasing lift to one wing and decreasing in another. Likewise, the rudder also helps in turning the plane by yawing and deflecting the nose right/...
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1answer
116 views

Can ailerons be used to control yaw and pitch [closed]

Is it possible for an aileron to be used to control the roll, pitch and yaw of a vtol drone
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3answers
12k views

Why do some aircraft have multiple ailerons per wing?

In a recent flight on an Airbus A380 I noticed that its ailerons are split into three segments which move independently. What advantages does this design have? Do other aircraft have split ailerons (...
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1answer
285 views

What is the relation between flap setting and aileron droop on the A350?

The A350 has a aileron droop function, which is linked to the flap setting. In contrast to other aircraft with aileron droop, the A350s ailerons do not droop when the flaps are fully extended. I ...
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3answers
41k views

What is a skidding turn (vs slipping turn)?

I am trying to understand the concept of 1) What qualifies a turn to be skidding or slipping 2) how we need to give elevator back pressure if we do not want to 'slip' the turn. While browsing for ...
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2answers
1k views

What is an aileron bushing?

What is an aileron bushing,and what's its use?
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2answers
453 views

What is a minimal step angle deflection for flight control surfaces?

If the flight control surfaces (ailerons, elevators, rudder) are controlled digitally by servo motors, yet disregarding the way how the input to the servo motors get generated (manually or autopilot), ...
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1answer
796 views

Why does the A320 right aileron float on dual engine failure?

On this question for the A320 after dual engine failure it says: When the hydraulic power is lost, the right aileron is lost, and is in the upfloat position. Why would this affect only the right ...
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2answers
162 views

Why flaps can deflect up to 25°+ without stalling the wings? [duplicate]

According to this graph,plain flaps have their highest Cl at about 2 and stalls at about 15°,my question is how then do airplane flaps reach 25°+ of delflection when this gragh clearly states that ...
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1answer
554 views

Can an aileron stall in-flight?

Horizontal stabilizers stall, so I was wondering, is it possible for an aileron to stall? If yes, at what angle of attack?
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0answers
317 views

Why are Leading Edge Flaps (LEFs) create lift while down at slow speeds but decrease lift while down at higher speeds?

When taking off or landing, both LEFs and trailing edge flaps (TEFs) for fighter aircraft are in the down position to provide more lift. However, when flying around at higher speeds (let's say 500-600 ...
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2answers
2k views

Why would the front edge of an aileron fold outward?

I was just enjoying a movie of one Svetlana Kapanina flying her EA300. One camera looks out of the cockpit over the left wing. In a couple of scenes, the aileron of the wing can be seen quite clearly. ...
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1answer
204 views

What determines spanwise placement of spoilers for roll control?

Specific application of spoilers was discussed in What is the benefit of spoilerons compared to ailerons? As I remember it, 40yrs ago gliders had spoilers close to the wing tips - perhaps slightly ...
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1answer
576 views

How to define the aileron's deflection angle (in the Laplace domain)?

Very simple question here. I know what Laplace transforms are, but except for solving ODE's I haven't really used them in a real project or thought about it in a very pragmatic way. I am currently ...
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4answers
1k views

Is a monobloc variable incidence wing viable (updated)?

Could this be a viable way to control roll on an aerobatic airplane, using some sort of tab to control a monobloc variable incidence wing? Both wings are mechanically linked together in order to only ...
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5answers
5k views

Can an aircraft be turned without rudder input?

Is it possible for pilots to make a right or left turn, using just the ailerons and without rudder input in all airliners? If not why so, for what reason?
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1answer
474 views

What are the aileron lengths of commercial and military aircraft?

I would like to know the aileron lengths for different aircraft, such as: Cessna 150 Airbus A380, A320 Boeing 747, 777, 787 Lockheed Martin F-22 Raptor I have tried to search online, but was ...
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3answers
981 views

Can variable incidence wings replace ailerons?

If a wing can change its incidence angle, can aileron be omitted in the design? Since aileron are used to increase lift and decrease it. so is the incidence angle. How would the two solutions ...
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3answers
2k views

What's the purpose of partial autopilot disengagement after applying certain force to the control wheel?

Aeroflot Flight 593 crashed after the autopilot was partially disabled by applying certain force to the control wheel but the only function which was disabled was controlling the ailerons. This ...
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1answer
329 views

Are the Gulfstream III's ailerons controlled by hydraulically boosted cables?

Are the ailerons for a Gulfstream III controlled cables with hydraulic boost? Also, is it possible that an aircraft mechanic could easily access the control to tamper with it?
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0answers
931 views

How does corrugated skin influence the effectiveness of ailerons?

Recently I found a paper about incorporating corrugated skins in aircraft called 'Corrugated composite structures for aircraft morphing skin applications' by C. Thill, J.A. Etches, I.P. Bond, K.D. ...
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1answer
568 views

Do high-speed ailerons help with the roll rate control in non-FBW?

Do inboard high-speed ailerons help with the roll control by decreasing the moment arm as a secondary benefit? As in make it harder to exceed the roll limits when at high-speed. I know the main ...
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3answers
4k views

Do the A380 ailerons act as air brakes on landing?

Last month I was on an Emirates A380 to London Heathrow. I noticed on the landing, the right ailerons were fully up along with the spoilers when decelerating on the ground. Are the ailerons configured ...
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1answer
1k views

Is the A380 ailerons' kinematic modified in alternate law?

I was looking at a video of a A380 display that led me to the "valse des ailerons". This strange ailerons behaviour is available in normal law, but what happen when some fly-by-wire features are not ...
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2answers
4k views

Can passenger plane do an aileron roll and fly upside down? [duplicate]

I've researched this topic and as far as I can tell any plane can fly upside down if it's already in this position. It just needs to be angled enough so that its wings are angled upwards. I believe ...