30 votes
Accepted

Are the functions of ailerons and rudder similar?

Short answer: Rudder and ailerons have different purposes and control rotation about two different axis. However a rotation about one axis induces a usually unwanted rotation on the other one. In ...
  • 68k
30 votes

What is a skidding turn (vs slipping turn)?

The terms "slip" and "skid" refer to two different types of uncoordinated turn - neither has much to do with the elevator, instead both depend on what the rudder is doing: Skids In a skid you have ...
  • 67.5k
28 votes

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

This is real easy, no explanation required: Tell your student to stick their hand out the window of the car driving 25mph in the city and rotate it like an aileron. Then have them do it on the freeway ...
  • 16.6k
21 votes
Accepted

Why would the front edge of an aileron fold outward?

That is an enclosure for a counterweight, either made from steel or lead to balance the aileron and/or reduce control flutter in various flight regimes. The extension provides an additional lever arm ...
19 votes

Do the A380 ailerons act as air brakes on landing?

Yes the ailerons deflect upwards after main wheel touchdown to dump as much lift as possible: they work as lift dumpers, together with the spoilers which are deployed first. Source: an A380 pilot ...
  • 58.9k
16 votes
Accepted

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

Downward aileron travel must be restricted when flaps are deflected. Since flaps change the local incidence on the flapped part of the wing, the outer wing will experience an increase in its local ...
16 votes

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

The word aileron specifically refers to a part of the airplane, usually, but not always, connected to the back edge of the wing, that is used to control roll and to turn the aircraft when used in ...
  • 4,769
15 votes
Accepted

What is an aileron bushing?

Bushings are a type of bearing that has no rotating parts. They are among the oldest bearings known. There is nothing special about it being for ailerons, except that is will be installed on the ...
  • 31.6k
13 votes

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

Flaps which only extend over part of the wing will cause lift changes mainly over that part of the wing, which will result in a lift distribution over span which is far from the elliptic ideal once ...
13 votes

Can all airliners be turned without rudder input?

It depends on the aspect ratio of the wing and the lift coefficient. Short, stubby wings at low angle of attack will not create much adverse yaw with aileron input, especially when the ailerons have ...
12 votes
Accepted

Is the A380 ailerons' kinematic modified in alternate law?

Valse Des Ailerons (Waltz of Ailerons) or VDA is a nickname for the Load Alleviation Function (LAF) which is part of the flight control system. LAF uses all ailerons and spoiler 6 to 8 to alleviate ...
  • 75.4k
12 votes
Accepted

Why is using opposite rudder and aileron necessary in left turn for coordination?

First and foremost you should always be looking at the turn coordinator to see what is going on and applying rudder as necessary. In your specific case (if we want to discuss the physics), basically ...
  • 96.5k
12 votes

Do the A380 ailerons act as air brakes on landing?

The ailerons, along with the spoilers are configured to act as lift dumpers on touchdown in most of the newer Airbus aircraft. This was introduced in the Elevator Aileron Computer ELAC standard L96, ...
  • 98.8k
11 votes

Why is using opposite rudder and aileron necessary in left turn for coordination?

You should just look at the ball and that will remove all doubt. If the ball is to the left, you use left rudder. It's that simple. After a while, like a couple hundred hours, you will start to feel ...
11 votes

Is a monobloc variable incidence wing viable (updated)?

Yes it is a viable way for roll control - aerodynamically that is. The mechanism you describe is a proper servo tab, where the aeroforces on the tab are fed back, and the tab acts like a lever on the ...
  • 58.9k
11 votes
Accepted

Can an aileron stall in-flight?

The aileron itself doesn't stall, being part of the main wing. But since it alters the camber of the main wing it changes the local angle of attack in effect. On older airplanes, a down aileron at ...
  • 110k
11 votes

What is the difference between an aileron and a flap?

An Aileron is used to control the roll of an aircraft. Ailerons are found on the trailing edge of the wing, typically closer to the wing tip. Ailerons will move in opposite directions to each other, ...
11 votes

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

Most early ailerons were all-flying surfaces fitted between the wing tips. Examples include the 1906 Santos-Dumont 14.bis, the first plane to fly in Europe, S.F. Cody's 1908 British Army Aeroplane No....
  • 6,832
10 votes

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

Several good reasons depending on the design and intent of the aircraft: Mechanical simplicity. In your case of "flaperons", having a single set of control surfaces do two things decreases the number ...
  • 22.3k
10 votes
Accepted

How should control surfaces be modeled in simulations?

Any control surface changes both local camber and local incidence, so it would be best if you change the coefficients accordingly. If you use a panel code, it would be enough to change the local ...
10 votes

Why is using opposite rudder and aileron necessary in left turn for coordination?

There are already good answers, so I won't dwell on the standard advice to look at the slip indicator and do the necessary, but I'll answer to clear up a possible misunderstanding. You do not use ...
  • 12.6k
10 votes

Can all airliners be turned without rudder input?

For most aircraft, it is. Deflecting ailerons only results in adverse yaw: the aileron deflecting downwards has higher drag than the one deflecting upwards, and the nose turns away from the direction ...
  • 58.9k
10 votes
Accepted

Are there roll control devices other than ailerons?

Yes, that will work. If the entire wing tip pivots, it simply acts as an aileron that takes up the entire chord of the wing. Other alternatives to ailerons include: Weight shifting. If you can shift ...
  • 5,605
10 votes
Accepted

What are some common aileron failures?

When talking about that sort of thing, you're really looking for single-point-of-failure weak links that are difficult to detect during a walkaround or inspection. Hinges don't normally just let go ...
  • 110k
10 votes

Were leading edge ailerons tested?

Truly leading edge ailerons would not work. It is mainly the orientation of the trailing edge that determines the direction in which the air flow continues behind the wing and therefore the lift. The ...
  • 54.6k
9 votes
Accepted

What is the purpose of this aileron trailing edge strip?

Mr. Tom Clements—the Tom Clements—told me the following in answer to my inquiries on this matter.1 While I cannot yet offer any documentation on this in the form of a Beechcraft publication, this ...
  • 16.3k
9 votes
Accepted

Why doesn’t the A320 have any provision for manual aileron trim?

The normal flight law behaves as if it auto-trims the aileron, but there is no actual trim involved. The computer simply derives the desired deflection of ailerons using the pilot input and feedback ...
  • 54.6k

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