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Questions tagged [flight-controls]

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

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What causes the "dead band" phenomenon during takeoff on the Boeing 737?

During takeoff, the Boeing 737 encounters a distinctive "dead band" phenomenon after the initial pitch reaches approximately 10 degrees. Essentially, a slight increase in back pressure is ...
tedioustortoise's user avatar
11 votes
3 answers
1k views

Do aircraft using only spoilerons for roll control, with no conventional ailerons, have a crossover airspeed?

Airplanes generally have a crossover airspeed (a minimum airspeed below which directional control of the airplane cannot be maintained in the event of a rudder hardover). This is because, as airspeed ...
Vikki's user avatar
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6 votes
0 answers
364 views

Why do the spoilers on the 737 only deploy to the flight detent after a flaps up landing?

Following an all flaps up (no flap) landing, the SPEED BRAKE lever will not move beyond the FLIGHT DETENT and the spoilers will not fully deploy (for reference this is stated in the Fcom 9.20.14 rev ...
Deepak's user avatar
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3 votes
0 answers
194 views

How did the Caproni Ca.60 electrical communication system work?

On the wikipedia page for the Ca.60 it says: The two nacelles also housed a cockpit for one flight engineer each, who controlled the power output of the engines in response to the orders given by ...
Kieren Anderson's user avatar
3 votes
0 answers
326 views

What failure modes did Airbus seek to eliminate or mitigate when they changed the design of the A310/A300-600's rudder travel limiter?

In the NTSB report on the crash of American Airlines Flight 587, it is mentioned (in the context of the changes between the A300-B2/B4's rudder system, on the one hand, and the A310/A300-600's rudder ...
Vikki's user avatar
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2 votes
0 answers
82 views

Doubt in the Coriolis component of the net force acting on the aircraft

I dig a little and got to know that the force equation in 6DOF are nothing but a mathematical depiction of the fact that for a translating & Rotating body in 3D,The net force is the Translational ...
Ravi Pratap Singh.'s user avatar
2 votes
0 answers
101 views

What happens to ADIRU/FAC AP etc, when Pitot probes fail?

Situation: Suppose due to a bird strike pitot 1 is blocked with debris and radome is dented causing inconsistent airspeed indication between P2 and P3 (due to unequal airflow). This happens at about ...
Navoneel Karmakar's user avatar
2 votes
0 answers
168 views

Are there guidelines for how rudder pedals should be shaped?

I've seen a lot of rudder pedal design, from simple welded steel tubes to more complex branded aluminum forgings. They all seem to work equally well in my experience, and I've never found myself ...
Kenn Sebesta's user avatar
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2 votes
0 answers
181 views

Boeing 777 PCU Synchronization of Duplicate Hydraulic Actuators for Control Surface Deflection

I have a question regarding the redundancy of hydraulic systems used to deflect the control surfaces of a Boeing 777 aircraft (or the like). We know that "the elevators, ailerons, and flaperons ...
Adam Yassine's user avatar
2 votes
0 answers
792 views

Which Aircraft Utilise Fly-By-Light Controls?

Although I can find reference to the Eurocopter EC135 being a test bed for fly-by-light, I am not sure if it has entered production with the system [1]. The only confirmed aircraft I can find is the ...
AerospaceDoctor's user avatar
2 votes
0 answers
394 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 ...
Christopher Helton's user avatar
2 votes
0 answers
227 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 & ...
cyberdyne's user avatar
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2 votes
0 answers
151 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 ...
JZYL's user avatar
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2 votes
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189 views

What is the communication protocol for the side-stick in the F-16 or F/A-18?

The side-stick in the F-16 or F/A-18 communicates with the flight control computer to transmit the pilot inputs. This transmission uses a protocol. Which protocol?
shooshool's user avatar
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2 votes
0 answers
76 views

Is there a general standard for servo actuators?

It is said in the standard AS94900 that the standard ARP490 should be considered for the actuators of the control surfaces in the aircraft. However, this standard is on servo valves and not servo ...
shooshool's user avatar
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1 vote
2 answers
58 views

Whats the derivation of a low speed ratio for stall warning?

I've seen an equation related to stall and angle of attack in a few places like this patent that goes more or less: $$ \frac{CAS_{alert}}{CAS_{current}} = \sqrt{\frac{C_{L,current}}{C_{L,alert}}} $$ ...
RealAnswersNotAI's user avatar
1 vote
0 answers
51 views

How elevator and ailerons affect attack and roll angles?

I was trying to model the flight of an aircraft and i need some function that expresses the change of attack and roll angle in function of the elevator and ailerons (respectively). Does anyone have an ...
yo yo's user avatar
  • 111
1 vote
0 answers
118 views

How far apart are the rudder pedals on a Piper PA-28?

How far is the left rudder pedal from the right pedal on a Piper PA-28? I assume the left and right seats have equal pedal spacing, but if not, the left seat is what I would like to know.
kj7rrv's user avatar
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1 vote
0 answers
151 views

Pilatus PC-12 vertical tail size

Does anyone know what the dimensions / surface area of the vertical stabilizer is on that plane? Additionally, does anyone know the approximate tail volume and its coefficient? Could not find it ...
Vincent Cerowski's user avatar
1 vote
0 answers
132 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 ...
shooshool's user avatar
  • 407
1 vote
0 answers
176 views

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.
Sapna Nahata's user avatar
1 vote
0 answers
117 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?
George Clooney In a Mooney's user avatar
1 vote
0 answers
103 views

what are the no load rates of f-16 control surfaces?

What are the no-load rates for the control surfaces of f-16 like flaperon,leading edge flap and horizontal and vertical stabs?
shooshool's user avatar
  • 407
1 vote
0 answers
77 views

Does the SAS (stability augmentation system) actuators of f-14 use jet-pipe or flapper-nozzle technology?

F-14 uses electrohydraulic servo actuators for its SAS. What type of hydraulic amplification is used in F-14? jet-pipe, flapper-nozzle or something else?
shooshool's user avatar
  • 407
1 vote
0 answers
183 views

What factors should be considered to select jet-pipe or flapper-nozzle technology for a primary control surface?

How is the servovalve mechanism chosen between these two mechanisms? what are their advantages and drawbacks?
shooshool's user avatar
  • 407
1 vote
0 answers
794 views

Why does the KC-46 use an MCAS?

The KC-46 tanker aircraft (the U.S. military's designation for the 767s it uses as tankers, and which every other country calls the KC-767) uses an early version of an MCAS.1 This was ostensibly ...
Vikki's user avatar
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1 vote
0 answers
159 views

What is the selection algorithm in f-16 stick LVDT?

In a reference: https://www.nasa.gov/centers/dryden/pdf/88102main_H-1344.pdf page 67 (71 of pdf file) in Table 12, it is said that the signal selection algorithm from the redundant LVDT of stick in f-...
shooshool's user avatar
  • 407
1 vote
0 answers
127 views

Would throttle steering of a forward-swept-winged aircraft be possible?

Fortunately (or perhaps unfortunately, given the number of crashes that had to occur for us to figure it out), the use of throttle manipulation to control an airliner with disabled primary flight ...
Vikki's user avatar
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1 vote
0 answers
81 views

Effect of Rudder on Velocity Vector

Suppose we have an aircraft flying in steady, level flight at zero angle of attack. In this configuration, the velocity vector $\vec{V}$ is perfectly aligned with the $x$ axis. At some time $t=t_0$, ...
Josh Pilipovsky's user avatar
0 votes
0 answers
76 views

After designing an autopilot, how does it affect aircraft modes?

Let's say an autopilot will be designed for the longitudinal axis. A pitch attitude hold will be made with a sas in the inner loop and a pid in the outer loop. How does this system change the phugoid ...
gibsonsg's user avatar
0 votes
0 answers
229 views

What type of ailerons does the Piper Seminole has?

I understand that the PA44 has differential type ailerons, but do they also have frise type ailerons? Making them a combination of differential and frise type similar to the Cessna 150/152/172 models? ...
Breaach's user avatar
  • 159
0 votes
0 answers
65 views

ST-901 GPSS Converter diagrams

I'm looking for pin-out diagrams for the S-Tec ST-901 GPSS Converter. This unit will go between a Garmin GPS400W GPS Navigator and an S-Tec 50 autopilot.
Dan C's user avatar
  • 1
0 votes
1 answer
154 views

Pitch control in PX4 autopilot

I am trying to translate controller diagram of fixed wing px4 attitude control into mathematical form. While going through the controller diagram Fixed-Wing Attitude Controller looking into PX4 github ...
Shivam Goswami's user avatar
0 votes
0 answers
119 views

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 ...
jenifer's user avatar
  • 21
0 votes
0 answers
70 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 ...
Manoz Bhandari's user avatar
0 votes
0 answers
50 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 ...
Ryan Piawiya's user avatar
0 votes
0 answers
220 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 ...
Zahi Azmi's user avatar
-1 votes
1 answer
2k 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-...
Marshin8726's user avatar