Questions tagged [flight-controls]

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

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2answers
115 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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is there any information on the B-8 side stick? when was it made? [closed]

is there any info on the B-8 side stick? its history? in which airplanes was it used? I've been looking around the internet for information and can't seem to find any unfortunately
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3answers
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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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Guidance of 5V27 missile: what is twist angle between missile and radar system

Currently, I am learning about guidance physics of S125 system. As far as I have learned, the missile is guided to the target by the radar system on the ground. The position of target and missile is ...
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3answers
257 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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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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2answers
231 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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2answers
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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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1answer
102 views

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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2answers
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Where do flight sims get their data on aircraft flight characteristics?

Flight sims offer very realistic simulations of how a particular aircraft feels, claimed by pilot interviews on youtube. But how do sims get their data? First, does all this data even exist, i mean ...
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1answer
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Are aircraft certified for inflight thrust reversal required to demonstrate controllability in an asymmetric-reverse-thrust scenario?

For most jetliners, the inflight use of reverse thrust is prohibited (and often physically impossible), due to the potential for loss of control in the event of an inflight reverser deployment (a ...
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Why do the ailerons of this flying wing work oppositely compared to those of an airplane?

I made this simple wing glider and put some ailerons on it. I thought that the ailerons in this glider would work the same way it works on airplanes, wherein the roll will be in the direction of the ...
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1answer
714 views

How do tailless aircraft yaw? [duplicate]

I was doing research on control surfaces present on an aircraft and I noticed that some aircraft like the B2 Spirit does not have a vertical tail stabilizer and therefore no rudder either. How do ...
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Why aren't rudders automatic? [duplicate]

Why aren't rudder pedals automatic or connected with ailerons to keep the nose of the aircraft coordinated with the turn its entering? Wouldn't this make for an easier and smoother to operate aircraft?...
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Does the routine flown by the Thunderbirds in the F-16 feature true sustained knife-edge flight?

Does any aerobatic routine flown by the USAF Thunderbirds in the F-16 feature true sustained knife-edge flight? By "true sustained knife edge flight" we mean that the aircraft is maintaining ...
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Why is there a difference in the max spoilers extension between the A320 and A321 in a roll?

I was recently reading the Flight Controls chapter in the FCOM and I read that spoilers 2-5 extend a maximum of 35 degrees on the A320 however on the A321 spoilers 2,4 & 5 extend a max of 35 ...
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1answer
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E-2/C-2 left thumb control?

For some reason I ended up binge watching E-2s and C-2s doing shots and traps on YT. One thing caught my eye; especially during the approach, the pilot’s left thumb is in constant motion pressing a ...
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1answer
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Does a RC glider always loop when launched?

In the below video, the guy sets "launch mode" for hand launch where he adds a little bit of elevator. Will a glider always loop up when launched horizontally, even if the tail is set to ...
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3answers
755 views

Can aileron differential eliminate adverse yaw?

Can aileron differential completely eliminate adverse yaw?
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1answer
284 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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Can Savannah be stalled with agressive yoke pull?

My friend fly ultra light Savannah, 2 seats plane,wings dont have slats ,it has vortex generators at leading edge. He says that he cant stall plane with agressive yoke pull (I talk about speeds above ...
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How do the A320 flight controls reconfiguration laws work?

Can someone explain in simple terms the reconfiguration laws? I have hard time understanding ELAC, SEC, FAC Priorities in FCTL Architecture Diagram.
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1answer
113 views

Do pilots typically mix roll/yaw when piloting various planes? [duplicate]

When flying on GeoFS, a popular flight simulator online, one of the default settings is to mix roll and yaw. Of course, it isn't real life, so I think it might differ from flying in the real world. Do ...
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1answer
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Why does the pilot do this when taking off?

In the past (before the pandemic, of course), when riding commercial jets, I noticed that sometimes, the pilots would bank to port, then to starboard, and repeat that multiple times, while climbing ...
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2answers
181 views

What are the primary and secondary flight controls for the SEPECAT Jaguar?

What lift augmentation devices are used in the SEPECAT Jaguar? I couldn't find any information.
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1answer
153 views

Why don't airliners use light strips on physical controls (yoke/stick, throttle and trim) to indicate who has control - pilot or flight computer?

I've watched a lot of Air Disasters episodes about crashes where pilots thought auto-pilot, auto-throttle, auto-trim were "in control" but they weren't (or vice-versa) due to some innocuous ...
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169 views

How do fighter jets stop pitching motion after a elevator deflection?

I'm working on a flight simulator , In which the jet has only ailerons , rudder , and two elvators at the back . When I nose up my aircraft via elevator deflection , it just keeps pitching up ( even ...
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149 views

Is there an advantage to combining trim function with yoke?

SUMMARY: What if the yoke didn't require constant pressure, as is the case with the current "trim" function? In all cases that I know of, airplanes have had the yoke (which you need to apply ...
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3answers
312 views

Does the F-4 Phantom use (have) differential horizontal tail deflection?

Is differential horizontal tail deflection used to roll the aircraft around the longitudinal axis along with the ailerons / spoilers and a bit of rudder?
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192 views

Writing Research: What stick sensation would you expect in an Su-15 with a total hydraulic flight system failure?

The title pretty much says it all. I have a very specific research question in relation to a writing project I'm working on. The main character is in an Su-15 performing low flying military training, ...
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Do any airplanes use a 3-axis joystick? [duplicate]

Do any airplanes use a 3-axis joystick? Or is the Z-axis twist not mechanically or ergonomically (i.e. cross-axis coupling) viable?
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4answers
2k views

How is a plane with only ailerons and jet (no props) controlled?

I saw this video and was wondering how he is controlling the plane: It looks like he only has ailerons. It does look like he is shifting his body weight. Is that the ...
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5answers
6k views

Can airliners land with auto pilot in gusty wind conditions?

Why does the pilot make so many movements? I don't see that plane is moving all that much, but his yoke movements are strong and fast. For someone who is not a pilot, it almost looks like panicked ...
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Boeing 747 Autopilot PID Controller

For a personal flight simulator project, I am creating my own custom Boeing 747 classic series. I have about 50% of the project complete at a level of detail nearly equivalent to study-level flight ...
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2answers
112 views

What is the name of Control equipment? [closed]

I wanted to know the name of equipment that controls the control surfaces of an aircraft by taking commands from the pilot through it's hotas stick. The aircraft could be a combat 50's or 60's a/c, so ...
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1answer
213 views

How to find the angle of attack?

I'm trying to calculate the angle of attack (AOA) using aircraft some data. From what I understand the AOA is just the angle between the aircraft's forward unit vector (out the nose vector) and the x-...
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1answer
614 views

Why does the Eurofighter Typhoon has a long arm canard vs the close coupled canard of Dassault's Rafale or JAS-39 Gripen?

Rafale and Gripen are quite similar but the Eurofighter Typhoon has the canards far forward. I've been told that this was due to the shape of the air intake. Apparently the Typhoon's air intake was ...
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Coefficients outputs by DATCOM

I'm trying to understand the outputs given by the DATCOM method. For example I have this formula for pitching moment coefficient : DATCOM give me these coefficients related to the pitching moment : <...
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2answers
254 views

Does a constant power prop exist? What are the tradeoffs compared to a constant speed prop?

Variable-pitch props allow pilots to adjust the angle of attack of the propeller to change the load on the engine. The most common implementation of this is a constant speed prop where the prop ...
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1answer
89 views

Does the stability of a mass change if the center of gravity is above or below the point of thrust? [duplicate]

I was wondering if it makes any difference if the mass is balanced above or below the point of thrust. See image below for clarification: In the image you can see two configurations. The red arrow / ...
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How to correct dynamic stability of UAV fuselages?

I was trying to design a fuselage model of UAV with considering lift coefficient (CL), after this I analyzed stability of both wing on fuselage. First I did the individual analysis for wing and ...
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Stability Analysis of Aircraft

How can we do the complete lateral, longitudinal, and directional stability analysis of an aircraft by drawing appropriate geometry? I tried DATCOM+ but it has certain limitations. Is there any other ...
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417 views

How controllable is the 737 in single-engine manual-reversion flight? Is it controllably landable (or go-around-able) in this condition?

The 737 is practically the only civilian jetliner still in production1 to have provisions for flight-control manual reversion; in the event of a total failure of the A and B hydraulic systems, the 737’...
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6answers
6k views

Can a plane bank without turning?

Can planes bank without turning, and if so, how is it possible? A plane's wing is designed to naturally create lift; the explanation for that is that the greater speed of the air moving over the wing ...
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For the recertification flight(s) of the 737Max, will the FAA want to see a live runaway stabilizer?

With Boeing ready to start the testing Monday, will the FAA want to see a simulated runaway trim failure in flight?
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2answers
168 views

Helicopter retreating blade stall: Increasing the fwd speed decreases the tip speed on retreating side and angle of attack. So why limit on V_n.e?

On Retreating side: Speed of wind over blade tip = blade rotation speed - forward speed. So, with an increase in forward speed, the speed of the wind over tip is getting reduced. In airflow diagram, ...
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2answers
424 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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3answers
170 views

Is there any non-experimental way to obtain CL, CD, and CM as a function of the angle of attack and the control surface deflection angle?

I am working on a flight simulator for control algorithm testing. The issue I am facing is to come up with a relationship between CL/CD/CM and the angle of attack ($\alpha$) and the control surface ...
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1answer
122 views

Why do small jets usually have one low flap setting?

For example, the CRJ has a flap setting of 0, 8, 20, 30, and 45 degrees. The Learjet has similar features across their models, as far as I can see which is 0, 8, 20, and 40 degrees Why do smaller ...
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2answers
597 views

Why aren't quadjets required to remain controllable after a sudden, simultaneous failure of two engines on one side?

For all multiengine jets, it must be possible to maintain directional control of the aircraft in the event of a sudden failure of one engine in flight, with the other(s) firewalled, down to not far ...

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