Questions tagged [ailerons]

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

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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/...
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9 votes
1 answer
5k 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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31 votes
3 answers
15k 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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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. ...
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15 votes
4 answers
10k 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 ...
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11 votes
5 answers
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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 ...
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8 votes
3 answers
8k views

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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6 votes
1 answer
1k 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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8 votes
2 answers
870 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 ...
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22 votes
3 answers
48k 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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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 ...
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7 votes
3 answers
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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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6 votes
1 answer
1k 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 ...
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5 votes
2 answers
474 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?
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4 votes
2 answers
674 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 ...
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12 votes
8 answers
7k 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?
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9 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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6 votes
3 answers
1k 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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3 votes
2 answers
252 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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27 votes
3 answers
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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12 votes
8 answers
17k 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 ...
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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 ...
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5 votes
1 answer
576 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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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 ...
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3 votes
2 answers
520 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 ...
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1 vote
3 answers
680 views

What are some common aileron failures?

There are a few parts to the control system for an aileron in a light aircraft, such as the rods, bellcrank, cables, chains etc. What are the main reasons for aileron failures and what parts wear the ...
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0 votes
2 answers
381 views

On large aircraft, why do flaperons not run the full length?

This is a 777 flaperon. It looks rather tiny, compared to the flap. There have been air disasters where the airplane rolled uncontrollably for one reason or the other. It seems to me that a larger ...
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