Questions tagged [flight-controls]

The methods or mechanisms used to control an aircraft's movements in roll, pitch, and yaw.

Filter by
Sorted by
Tagged with
1
vote
2answers
137 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 ...
6
votes
3answers
276 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?
4
votes
2answers
181 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, ...
0
votes
0answers
53 views

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?
13
votes
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 ...
27
votes
5answers
5k 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 ...
1
vote
0answers
106 views

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 ...
0
votes
2answers
110 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 ...
0
votes
0answers
96 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-...
4
votes
1answer
186 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 ...
0
votes
0answers
33 views

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 : <...
2
votes
2answers
214 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 ...
0
votes
1answer
69 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 / ...
0
votes
0answers
41 views

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 ...
0
votes
0answers
62 views

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 ...
6
votes
0answers
235 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’...
20
votes
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 ...
1
vote
0answers
111 views

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?
1
vote
2answers
144 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, ...
4
votes
2answers
321 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 ...
2
votes
3answers
114 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 ...
1
vote
1answer
115 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 ...
2
votes
3answers
190 views

Why are the rudders of quadjets sized to accommodate for a sudden failure of a single engine, rather than two on one side?

For all multiengine jets, the rudder is required to be large enough to allow directional control of the aircraft to be maintained in the event of a sudden failure of one engine, with the other(s) ...
2
votes
2answers
306 views

Helicopter flight: Does the rotor disc plane and hub plane rotate along axis perpendicular to rotational axis?

In many pieces of literature, diagrams as below are shown to explain the directional flight of Helicopter. I have the understanding that the cyclic input will only change the pitch angle of the blades ...
3
votes
1answer
132 views

Why are the A300/310’s electric pitch trim switches inhibited with the autopilot engaged?

The A300/A310, like most other aircraft (except for some small general-aviation aircraft), has an adjustable-incidence-angle horizontal stabiliser, which is used to trim the aircraft in pitch (for ...
2
votes
0answers
66 views

Which connector and cables are recommended for CAN?

Which mechanical connector(s) and cable(s) is/are recommended to arrange a Controller Area Network (CAN) bus communication or its aerospace counterpart ARINC 826 in the aerospace industry (civil & ...
1
vote
2answers
148 views

Helicopter Flight: What is the reason for decrease in Induced drag with increase in speed?

As per the figure the induced drag will decrease only if the AoA of the blade is decreased — But in the forward flight, cyclic input increases and decreases the AoA throughout the blade rotation cycle....
3
votes
1answer
141 views

How are pitching and rolling moments transferred from rotor to the body?

When a rotorcraft pilot moves pushes on the cyclic control stick, the swashplate tilts so that angle of attack of the retreating blades increase and of the advancing blades decrease, which creates ...
3
votes
4answers
197 views

In helicopter's forward motion, how is the forward pitching moment taken care off?

When the rotor disk is in the position shown by the dashed lines, the net Lift is at an angle. It should produce a forward pitching moment about CG (Center of gravity). That can cause the helicopter ...
0
votes
1answer
127 views

What do left handed F-16 pilots do about the right side stick? [duplicate]

I was just watching a video about the Thunderbirds and Blue Angels doing their city fly overs and realized that the F-16 has a right hand side stick, which begs the question "what do left handed F-16 ...
7
votes
2answers
285 views

Are 737 pilots required to train in manual-reversion flight?

All jetliners prior to about 1970 had flight controls that could, if need be, be manually operated without the use of any hydraulics: Some, such as the DC-9, had manual flight controls with hydraulic ...
-1
votes
1answer
174 views

Can such an aircraft take off vertically?

The compressor ejects compressed air from the gap at high speed. The red arrow represents the path of compressed air. It is lift that adjusts the speed of the compressed air to adjust the aircraft.
0
votes
0answers
36 views

Help clarify Pilot's difficulty balancing forces acting on aircraft during cruise stage?

How does the ideal disposition of the four forces in an aircraft relate to the nose-up or nose-down pitching moments? What are the difficulties that the pilot can face to maintain such an ideal ...
0
votes
1answer
117 views

what are the Common roll angle and roll rate limits for civil flights?

I'm currently doing simulations for eVTOL type of vehicles and for the purpose of controlling the attitude, I'd like to know the common limits for roll and roll rates (more important) that are in ...
2
votes
0answers
124 views

Can commercial automatic flight control fly back-side?

For most commercial flight director, autopilot and auto-throttle systems (e.g. the A330-300, B737-800), the flight director/autopilot flies the altitude hold (ALT) or vertical speed (V/S) mode by ...
1
vote
1answer
95 views

How can I reduce the Short Period frequency of a Pitch Hold Auto-Pilot while maintaining stability?

I am working on a Pitch Hold Auto-pilot for F-104, which has the following damping characteristics; which clearly shows that it has degenerated and unstable phugoid mode. well, I made a SAS which ...
6
votes
3answers
869 views

In simple mechanical stick linkages, is there crosstalk between the aileron and the elevator movement?

The background story: I'm an aviation enthusiast (who has played a lot of sim in his life and will play lots more :D) but I've never actually flown any plane myself, as in, actually used the controls ...
0
votes
0answers
26 views

AltFlap switch in F16 jet fighter at various stages in flight

If you apply ALT Flap in F16 the flight quality is somehow similar to the CATlll or TO/Landing gain (lower max AOA available - only 18 degrees - , roll rates halved) because this is emergency mode. ...
8
votes
1answer
2k views

Why shouldn’t the A330/40’s speedbrakes be used in alternate law?

On page 30 of the ATSB report into the QF72 accident (page 50 of the PDF file of the report), in a table describing the actions required of the flightcrew in response to some of the ECAM messages ...
5
votes
0answers
141 views

Was there more than one incident or accident where an Airbus FBW aircraft reverted to mechanical backup?

There was an accident Smartlynx A320 training flights MYX-9001 at Tallinn on Feb 28th 2018, where ELAC pitch control failed due to fault in the stabilizer actuator, and then both SECs failed due to ...
5
votes
2answers
460 views

Why do the A320’s primary flight controls have hydromechanical backups only for the rudder?

The A320 is primarily a fly-by-wire aircraft, with the pilots’ joystick and rudder-pedal inputs not going directly to the flight-control surfaces, but, rather, to the aircraft’s flight-control ...
1
vote
2answers
106 views

Did Solar Impulse flight in commercial airspace and have kind of type 23 certification? [closed]

I read that the amazing Solar Impulse back in 2015 had circulated around the globe for 500 hours. It flew with speed 70 km/h and altitude of cruising 28000 ft. My questions are below Did it fly in ...
19
votes
3answers
5k views

Why does Boeing use a trim wheel in the 737 and not their other products?

Why does Boeing use a trim wheel in the 737 and not any other products? Is the trimmed state for the 737 just more important than in the 777? Or even 747? It gives the impression that a secondary ...
2
votes
2answers
183 views

Does joystick position control bank angle in some Airbus aircraft? And what happens when the pilot deflects the joystick when wheels are on ground?

Does joystick position control bank angle rather than directly controlling aileron/spoileron deflection in some Airbus aircraft? Also, what happens when the pilot deflects the joystick when the all ...
0
votes
0answers
65 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 ...
3
votes
1answer
243 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. ...
1
vote
2answers
93 views

What angle of deflection / pitch on the rotor blades can the controls generate?

I was wondering, if a pilot uses full input on cyclic and collective, what pitch angle can be achieved for the rotor blades? Is there a mechanical stop to prevent extreme angles of attack? And how ...
0
votes
0answers
67 views

How is the control surface configuration of predator/reaper for redundancy system?

In commercial aircraft like Airbus or Boeing, there are several control surfaces that work in the same function such as for roll control capability, the control surfaces are aileron and spoiler. Also ...
0
votes
1answer
65 views

Procedure for simulating nonlinear flight dynamics

I am trying to simulate F/A-18 Hornet on Simulink. So, here is how I have made the model: Firstly, the initial flight parameters(Alpha, beta, V(magnitude), rho) are being calculated based on the ...
7
votes
1answer
638 views

Why was pitch angle protection not active in the CRJ 200 during the crash of Sweden Air 294?

I have read about the CRJ 200 Sweden Air 294 crash. I understood that the main cause of the accident was faulty IRU and wrong declutter PFD design. The human error also lead the aircraft into a ...

1
2 3 4 5
10