Questions tagged [flight-controls]

Use for cockpit controls (trim, yoke, etc). Use [control-surfaces] for the surfaces that actually move.

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Why do the ailerons on an A320 droop when the engines are shut off and the 787 ailerons dont droop when the engines are shut off?

I have been wondering why the ailerons on the A320 (and other Airbus aircraft) droop when there is no power from the hydraulic pump. From my understanding of hydraulic actuators, the position where it ...
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How AeroVironment's Switchblades steer their flight?

I'm very intrigued with how AeroVironment Switchblades: SW-300, and SW-600, steer their flight. There are plenty of images and animations and to my observation, none of the Switchblades have ailerons, ...
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How does control system design ensure correct elevator position with the steering system unlocked? [closed]

I’m having some trouble answering the following problem encountered in one of the worksheets for aviation students: The plane shown in the picture stands on the runway. The pilot, while getting off, ...
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7 votes
6 answers
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Aircraft pitch and AOA change during a coordinated turn maneuver

Let us say I am flying a constant airspeed turn while maintaining my altitude, when I enter into the turn, lift has to be increased and since airspeed remains constant, the AOA has to be increased to ...
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what is considered a good pedal performance in a fighter?

What is considered a good performance in designing the directional control law in a fighter? Is it acceptable to have some roll when using a pedal? For example, is it acceptable to have 40 degrees ...
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Does the pilot always need to use stick to compensate roll caused by pedal?

When the pilot uses pedal in a fighter like F-18, does the aircraft roll? If so, is it the pilot's job to compensate this roll or the control system compensates it automatically? In other words, is it ...
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What is the maths behind Loitering of Aircraft?

I am making a controller for loitering using PIDs. The equation which is used to find the radius of circle given bank angle and speed is in following link: How to calculate angular velocity and radius ...
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What is the modern approach to extract vehicle system responses to control input? [closed]

What is the modern approach to extract vehicle system responses to control input? Is everything thrown into a CFD simulation and the responses recorded or is something else done? Are wind tunnels ...
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How does the Sikorsky X2 technology rotor control blade pitch?

All of the helicopters by Sikorsky using their X2 technology coaxial rotor system don't seem to have a conventional swashplate and control rod assembly for controlling the pitch of the rotor blades. ...
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How does a helicopter phasing unit work?

I'm currently distance studying to become a B1.3 technician and the course material mentions a phasing unit in the control system, but the descriptions and images are very abstract and I'm having ...
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Is the movement of the leading edge flaps not symmetrical on the MiG-29?

Original: russianplanes.net On this Mig29 in above picture leading edges are at different angles not in line. Same thing happens in flight times when rolling?
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Are helicopters easier to fly nowadays due to computers?

4 decades ago, someone who seemed to know about helicopters said that hovering in one was like balancing on a ball (like bears do in a circus). But it seems like by using computers hovering and other ...
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Putting the yoke behind your elbows

In the 1989 documentary film "Always", our protagonist pulls out of a high-speed dive by reaching around the yoke and pulling with the back of her arms: Is this unusual, for a large high-...
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Why does this F18 have the rudders pointing towards each other? [duplicate]

I have seen this when they are parked and when taking off from the carriers.
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2 votes
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Why do military and tandem seat aircraft have the throttle on the left?

Why do military and tandem seat planes have the throttle on the left? As seen in the photos below of an F18 Hornet and a P38 Lightning. Is there a reason for this layout?
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How does this Bell 206 cyclic control linkage work?

I'm studying the Bell 206 Maintenance manual to understand how the pilot's control inputs get converted to swash plate movements. This diagram seems to explain the cyclic well, but I can not figure ...
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What was the tactical purpose of the unusual flight control system that allowed the Northrop YA-9 to generate sideforce without banking?

What was the tactical purpose of the unusual flight control system that allowed the Northrop YA-9 to generate sideforce without banking? (And, how was the system controlled by the pilot?) (Image is ...
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How are control surface problems in wings having high bending dealt with?

In some aircraft which have large wing deflection due to bending, do ailerons or flaps not get stuck or bent themselves? In the case where hinging axis is also bent how do ailerons operate?
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Unclear about how you can have high RPM but no power

I did see this question: Manifold pressure vs power vs rpm But I'm still a bit unclear about the following. I've only flown cherokee pa28s, so I might not have empirical knowledge of the following. I ...
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How the AOA, Pitch and FPA are changing during a flight maneuver

For a steady state flight, there is a equation that FPA + AOA = Pitch, but how these three variables are correlated during a flight maneuver like currently I am in a leveling flight and then I want to ...
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4 votes
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What are specified rudder pedal forces?

Zeus have previously provided us with links to aviation certifications standards (e.g. FAR 23.155, FAR 23.397). I think Far 23.155 specifies the forces to provide maximum elevator control signal. But ...
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1 answer
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How does the flight controls performance differ in a compressible and in compressible environment?

I know that in low speed flight compressibility effect is negligible and in high speed there will be an effect but how do they differ in flight controls such as primary and secondary?
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1 answer
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How can PreciseFlight speedbrakes double the drag while being so small?

Look at this photo of some PreciseFlight© speed brakes: On the website it is claimed that these little red plates can double drag and descent rates. I cannot believe that. Can this be true, and if ...
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3 answers
173 views

Forward slip dynamics

I am perplexed on the dynamics of the forward slip. I am illustrating here: The intended ground flight path is axis +y, and the plane is forward slipping by banking right + left rudder. In order to ...
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1 answer
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Where in the cockpit of a fighter such as the F-22 or Su-57 is thrust vectoring controlled? [duplicate]

Does it use the stick? Pedals?
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9 votes
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OV-10 Bronco using airbrakes to fight adverse yaw?

Watching this Bronco display, perhaps this is an incorrect observation, but it looks like the airbrakes are independently used to counteract adverse yaw. What is the domain of use for these airbrakes? ...
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Can aileron control maintain track in a single engine failure on a twin?

Let us say I am flying a twin-engine aircraft and I got a engine failure during cruise, without any control on rudder and use the ailerons only, can I still maintain the target track or heading? Will ...
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How does the Bell V-280 (a tiltrotor) rotate, bank, and fly sideways? [duplicate]

Here is a video of Bell V-280 Valor. Seems like the old definition of airplane's control is no longer hold for this kind of airplane. If you click the link, it will go directly to the part I want to ...
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3 votes
2 answers
679 views

Can the rudder be considered part of the vertical stabilizer, and the elevator part of the horizontal stabilizer?

Or is it strictly correct to say these are separate elements, and you can't call the whole a "stabilizer"?
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7 votes
3 answers
943 views

How do airplane balance tabs (or control tabs) change the force on the pilot's controls?

According to the PHAK ch. 6 and this description regarding Ameristar 9363, one type of tab on an elevator is supposed to "decrease the pressure the pilot needs to exert on the flight controls.&...
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What does the "MAX EMR PWR" lever do in a Quest Kodiak?

On a photo of the Quadrant of a Kodiak Quest 100 there was an additional red lever to the left of the throttle (black handle) labeled with "MAX EMR PWR". Can anyone explain what what this ...
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When the F 16 landing the flaperons are used for rolling due to the functionality as ailerons, but after touching the ground it is the same?

In landing gains the flaperons are down 20 degrees. If you have to do corrections of the bank angle on approach then you move upward only one of the flaperons. But after touching the runaway it is ...
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1 vote
1 answer
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How do you quantify rudder effectiveness as a function of bank angle?

I'm currently reviewing just for fun aircraft dynamics based on OEI (one engine inoperative) scenarios. After reading that "lower pedal forces at higher bank angles" are required, it got me ...
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5 votes
4 answers
701 views

Can any helicopters use negative collective to descend rapidly?

On a helicopter, the collective is used to adjust the attack angle of all the main-rotor blades in the same direction by the same amount, causing the amount of lift generated to increase or decrease ...
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4 votes
0 answers
146 views

Does a B777 have a control priority button?

There have been accidents where one pilot gets confused, panics, inappropriately pulls or pushes the control column, and the other pilot does not manage to get control from them and the aircraft ...
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-1 votes
1 answer
462 views

Why doesn't the A-4 Skyhawk require rudder in coordinated turns like on other Century Series aircraft?

The Douglas A-4 Skyhawk is a subsonic jet aircraft design from the early fifties. Usually, in order to make a coordinate turn without skidding or slipping , the pilots of the other types of aircrafts ...
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15 votes
3 answers
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Best way to correct for plane's natural tendency to turn left?

I am a new private pilot in training. I've only had about two hours of flight lessons so far, so I'm still quite new to this. In a single engine, PA-28-181 Archer, I found that the plane has a natural ...
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5 votes
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What is the purpose of attaching a flat plate to the rudder trailing edge?

These are photos of Tecnam P2006T rudder trailing edge. Why it has such flat plate mounted at the end of the rudder?
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3 votes
1 answer
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On a Gulfstream jet checklist, do you do the walkaround before or after disengaging the gust locks?

On a Gulfstream jet checklist, do you do the walkaround before or after disengaging the gust locks? With small planes we generally remove the gust locks as we do the walk around, but with a larger jet ...
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5 votes
3 answers
1k views

What is the meaning and origin of the phrase “dead band” in relation to flight controls?

A quote from the Boeing 737 NG FCTM: With both hydraulic systems A and B inoperative, the ailerons and elevator are controlled manually. A noticeable dead band will be observed in both of these ...
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5 votes
1 answer
260 views

Why do helicopters not flip when using cyclic pitch control to move?

Let's say a helicopter wants to move forward. To do so, cyclic pitch is applied to the blades 90 degrees off which applies a torque on the blades to tilt the craft forward. Once the helicopter is ...
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1 vote
1 answer
238 views

Does any USAF fighter jet use surfaces near the front for pitch control?

Some European fighters like Eurofighter use frontal surfaces for pitch control. Does any US fighter use this configuration? And what are these surfaces called?
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5 votes
2 answers
680 views

What control inputs are required to perform a "turning-while-in-flight" maneuver in a helicopter?

My question is relatively simple and has to do with the required control inputs to perform a simple turning maneuver over a large area. Suppose a helicopter is traveling in forward flight, straight ...
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1 vote
5 answers
339 views

In theory, can jetliners remain controllable after losing the entire tail section?

The scenario here is a detachment of the tail,one with the whole empennage. Could a variant of an existing model of swept winged jet airliner be made to remain controllable, using ailerons, ...
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16 votes
3 answers
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How and why can multiple people control the Boeing B-29?

I am making a down-to-the-1/128th-inch (literally, to the 1/128th inch) model of the Boeing B-29 Superfortress in SketchUp. Starting from zero, I had to make the entire plane up, and to be honest it ...
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7 votes
3 answers
422 views

Why do X-wing configurations missile/guide bombs use symmetric airfoils?

From all the missiles/guide bombs I have come across, I've always observed that a symmetric airfoil is used for both the wing and tail. Why not have a cambered airfoil for the wing and a symmetric ...
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1 vote
0 answers
47 views

Choosing $\phi/\beta$ in Lateral-directional control design

In designing the Lateral-directional controller for aircraft, there is a parameter called $\phi/\beta$ that is defined as the ratio of the magnitude of the bank angle to the sideslip envelopes in the ...
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9 votes
3 answers
470 views

Why would an artificial horizon's roll axis be different on ground and in flight?

Sorry, if I'm a bit verbose here, but since I don't understand the problem, I have difficulties to describe it. I created an artificial horizon using an Adafruit precision 9 DoF sensors and their AHRS ...
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1 vote
2 answers
111 views

Light aircraft elevator/aileron/direction not working [closed]

What is the correct procedure if a light aircraft (under1000kg) elevator/aileron/direction stop working? Is it alright to use the ballistic parachute(if the aircraft is equipped with one)? If not, ...
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0 votes
1 answer
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What does gravity compensation do in flight control?

In flight control designs for lateral directional movement, there is a block named "gravity compensation". This block changes yaw rate measurement from "$r$" to "$r-g/Vcos(\...
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