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Questions tagged [ailerons]

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

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32 votes
3 answers
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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 (...
maimou's user avatar
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27 votes
3 answers
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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 ...
binaryfunt's user avatar
22 votes
4 answers
51k views

What is a skidding turn (vs slipping turn)?

I am trying to understand the concept of What qualifies a turn to be skidding or slipping how we need to give elevator back pressure if we do not want to 'slip' the turn. While browsing for answer ...
user2927392's user avatar
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18 votes
1 answer
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Why aren't 757 scimitar winglets flush with the ailerons?

Over my many past flights aboard 757s, I have seen changes being implemented with their design. One of which was notably their refit of scimitar winglets. Although one of their most notable ...
Ja380's user avatar
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16 votes
1 answer
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What is the purpose of this aileron trailing edge strip?

See the following photos of the LH aileron of a Beechcraft King Air B200: Source: own work Source: own work As seen in the above photos, the Beechcraft King Air B200 has what I would describe as a ...
J W's user avatar
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15 votes
2 answers
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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. ...
doppelfish's user avatar
15 votes
4 answers
11k views

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 ...
HUB's user avatar
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14 votes
2 answers
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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. ...
Philippe Leybaert's user avatar
13 votes
8 answers
22k views

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 ...
Ryan Griffith's user avatar
13 votes
8 answers
8k views

Can all airliners 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?
securitydude5's user avatar
13 votes
1 answer
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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 ...
Manu H's user avatar
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12 votes
2 answers
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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/...
Dwiparna Datta's user avatar
12 votes
5 answers
3k views

What is the point of making one control surface play the part of multiple control surfaces?

For example, flaperons (flaps + ailerons) and elevons (elevator + ailerons), are all individual control surfaces but play the roles of two different control surfaces. What is the point of making a ...
Madhav Sudarshan's user avatar
11 votes
4 answers
3k views

Were leading edge ailerons tested?

So far I have never come across any testing being done on having the ailerons and/or elevators on the leading edge of a wing, rather than on the trailing edge. Does anyone know of such tests existing? ...
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11 votes
1 answer
2k 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 ...
Habitablaba's user avatar
11 votes
3 answers
3k views

The F/A-18 Hornet , F15 and MiG-29 ailerons from the external parts of the wings go up some degrees in flight ,meaning adding " crow" .Why?

In some parts of the flying envelope of the F/A-18 Hornet and MiG-29 the ailerons from the external parts of the wings go up in sync. They're made to go one up one down in order to get rolls, not up/...
George Geo's user avatar
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10 votes
4 answers
2k 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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10 votes
2 answers
4k views

How are the 737’s elevator and aileron cables attached to their control tabs without impeding the control surfaces’ motion under hydraulic power?

The 737 (all versions thereof) is one of the few jetliners still in production to have any manual-reversion capability for its flight controls in the event of the loss of all hydraulic systems. If ...
Vikki's user avatar
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9 votes
4 answers
3k views

What would an all-flying aileron look like, and would it be a good idea?

The only info I could find about someone doing this IRL was the British Army Aerorplane No. 1, but I don't think it ever flew with them. I don't know much about how this would affect the aerodynamics, ...
BobMcGeoff's user avatar
9 votes
3 answers
1k 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 ...
Diamondx's user avatar
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9 votes
1 answer
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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 ...
Michael T's user avatar
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9 votes
2 answers
736 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 ...
AirCraft Lover's user avatar
8 votes
1 answer
757 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?
David Teahay's user avatar
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8 votes
3 answers
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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 ...
Fabrizio Mazzoni's user avatar
8 votes
1 answer
2k 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 ...
Vikki's user avatar
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8 votes
2 answers
935 views

Can perfect turn coordination automation be achieved by linking rudder to aileron?

I was reading about the ERCO aircraft which apparently has a rudder-aileron linkage system that enables co-ordinated turns without the need for explicit rudder inputs. I've heard of Piper's having ...
curious_cat's user avatar
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7 votes
7 answers
2k views

Why does aileron response diminish as speed becomes slower, from slow-flight up to the stall? (In a light trainer)

Can someone phrase the explanation to this in simple words as you would explain to a student?
leha007's user avatar
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7 votes
3 answers
880 views

What happens if the gust alleviation system on an A380 fails?

In an answer, a user linked to this video of the gust alleviation system (GAS) on an A380. This seems like a complex system with many moving parts—all the ailerons move completely independently. What ...
Jonas G. Drange's user avatar
7 votes
3 answers
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 ...
sharptooth's user avatar
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6 votes
3 answers
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Why doesn’t the A320 have any provision for manual aileron trim?

To eliminate the need for pilots (human or automatic) to maintain continuous force on their aircrafts’ yoke/joystick and rudder pedals while flying, aircraft generally have some sort of trim mechanism ...
Vikki's user avatar
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6 votes
2 answers
1k views

What is an aileron bushing?

What is an aileron bushing,and what's its use?
David Teahay's user avatar
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6 votes
3 answers
2k 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 ...
Daniele Procida's user avatar
6 votes
2 answers
2k views

What is the benefit of a horn control surface?

Like the one above. Is it just so that you can hinge closer to the leading edge of the aileron or control surface? Why did the designers of the ATR-72 elect to use this feature?
Rory McDonald's user avatar
6 votes
1 answer
2k 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 ...
TomMcW's user avatar
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6 votes
1 answer
15k views

What is the purpose of an inboard aileron? [duplicate]

I've noticed that larger Boeing aircrafts (such as the 777, 767, 747, etc) are equipped with inboard ailerons. What is their purpose and why hasn't Airbus incorporated them on the A330 or the A340?
Madhav Sudarshan's user avatar
6 votes
2 answers
408 views

Why does my paper airplane with the ailerons configured to make it spin fly straighter than with them configured for straight flight?

I made a paper airplane with a standard design, except I cut out the back ~2 cm of the body, leaving ailerons on the wings. If I throw it with the ailerons straight, it doesn't fly very far and turns ...
Someone's user avatar
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6 votes
2 answers
611 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 ...
jwzumwalt's user avatar
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6 votes
1 answer
2k 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)
DeepSpace's user avatar
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5 votes
2 answers
1k views

How do linear actuators for flight controls work in fighter jets?

I've built some rc planes and know that in order to control an aileron in a rc plane, that you need a servo, a control horn(sticking out of the aileron), and a pushrod. However, I was wondering how ...
Luke Justin's user avatar
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5 votes
1 answer
13k 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? ...
DSP_CS's user avatar
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5 votes
1 answer
670 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 ...
dammy999's user avatar
  • 177
5 votes
1 answer
778 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....
curious_cat's user avatar
  • 8,444
5 votes
1 answer
498 views

Is an elevon (elevator + aileron) considered as an all-moving control surface?

The delta wing on Concorde uses elevon as its control surface. Is the elevon considered as all-moving control surface?
Azrul Akiff Azman's user avatar
5 votes
1 answer
673 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 ...
user33651's user avatar
  • 1,021
4 votes
2 answers
1k views

How to reduce altitude in a passenger jet without gaining forward speed in an emergency?

Assume the pilot is flying too fast and high for an emergency landing. What movement of the control surfaces must they apply to land the aircraft safely on the runway? I heard this type of manuever is ...
Ashwath Venkataraman's user avatar
4 votes
4 answers
616 views

Why don't I see this kind of split ailerons on aircraft?

Why don't I see split ailerons that work like spoilers going up and like normal ailerons going down? Isn't that a good way to get rid of adverse yaw? Adverse yaw is caused by difference in drag for ...
xvel's user avatar
  • 41
4 votes
3 answers
892 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 ...
DrZ214's user avatar
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4 votes
2 answers
2k views

What are the pros and cons of sealing the gap between the wing and the aileron?

I read somewhere that sometimes gap between the wing and aileron is sealed and this is done to reduce drag. But somewhere else I read that "slotted" ailerons allows for better aileron ...
Konrad's user avatar
  • 2,025
4 votes
2 answers
355 views

What advantage might interplane-strut mounting offer to ailerons, on the Curtiss Model F?

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 ...
Camille Goudeseune's user avatar
4 votes
1 answer
1k 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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