Questions tagged [ailerons]

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

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6
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7answers
1k 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?
9
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4answers
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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, ...
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1answer
240 views

Is this how ailerons are actuated?

I was wondering how ailerons work on fighter jets. I came across this after hours of research. Is that how fighter jet ailerons work? Is their a better picture or image that would be better. If there ...
4
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2answers
278 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 ...
17
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1answer
301 views

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 ...
0
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0answers
59 views

When the ailerons on the Airbus A380 are raised to act as spoilers, is roll control power diminished? Plus related questions

All questions pertain to the Airbus A380. 1) At any given airspeed, does the aileron-as-spoiler function reduce the roll torque generated by the aileron surfaces when the joystick is fully deflected ...
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3answers
189 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 ...
3
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1answer
225 views

What is the term for an aileron that’s also used as a ground spoiler?

Ailerons and spoilers1 have a considerable amount in common; both are wing-mounted panels, hinged at their leading edges, that move up and/or down to alter the aircraft’s aerodynamic characteristics. ...
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3answers
189 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 ...
7
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2answers
703 views

The F/A-18 Hornet and MiG-29 ailerons from the external parts of the wings go up some degrees in flight. 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/...
4
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1answer
426 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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0answers
32 views

What is the purpose of these “antennas” on the aileron and winglet (A320 Neo) [duplicate]

As title says, see attached picture:
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1answer
1k 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? ...
8
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1answer
219 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 ...
5
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1answer
387 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....
2
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0answers
83 views

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? ...
4
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1answer
624 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)
6
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3answers
919 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 ...
3
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2answers
233 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 ...
6
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1answer
698 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 ...
2
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1answer
391 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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1answer
124 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
600 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 ...
1
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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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2answers
1k views

What is an aileron bushing?

What is an aileron bushing,and what's its use?
4
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1answer
328 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 ...
4
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1answer
991 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
172 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 ...
3
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2answers
188 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 ...
8
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1answer
583 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?
2
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2answers
480 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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0answers
336 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 ...
15
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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. ...
6
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1answer
251 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 ...
1
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1answer
616 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 ...
10
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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?
4
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1answer
655 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 ...
9
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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 ...
27
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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 ...
2
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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 ...
9
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3answers
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 ...
2
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2answers
277 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 ?
3
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1answer
431 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 $c$ = ...
2
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0answers
984 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. ...
6
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3answers
666 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 ...
15
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1answer
2k views

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 ...
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1answer
618 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 ...
3
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1answer
331 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?
21
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3answers
43k 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 ...
4
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3answers
609 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 ...