Skip to main content

Questions tagged [flight-controls]

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

Filter by
Sorted by
Tagged with
1 vote
2 answers
57 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
0 votes
1 answer
73 views

Can we use leaf shutter mechanism as a drone dropping mechansim for payload weight of 3lbs?

I'm considering implementing a drone payload drop mechanism capable of handling payloads weighing up to 3lbs. I'm intrigued by the idea of using a leaf shutter mechanism for this purpose, but I haven'...
Ujjwal's user avatar
  • 9
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
1 vote
1 answer
74 views

Elevator / horizontal tail effectiveness at high speeds?

Take for example a jet fighter, when at low speeds vs high speeds, airspeed will differ a lot. As the turning moment is due to the lift force from the tail and lift increases quadratically with ...
SpiralingTessaract8164's user avatar
3 votes
1 answer
223 views

What does the C* (Cstar) parameter demand ?(A320)

I have been reading a LOT of research papers and many articles, but none of them tell how the C* parameter in Airbus is used for the vertical augmentation of the aircraft. I am aware that with a ...
Shogunrv'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
1 vote
3 answers
223 views

How can I control the flight path angle (or the ROC) with throttle in Simulink?

I need to implement an autopilot for my 3DoF (longitudinal motion) aircraft model in Simulink. My model is nonlinear, but linearizing it in Simulink hasn’t been an issue. I’m trying to develop a ...
leo95nf's user avatar
  • 55
5 votes
3 answers
1k views

why stabilator has a lower travel limit for down movements?

Within the POH of my aircraft, in a part titled "Control Surfaces Travel Limits", the manufacturer states: Stabilator: Up 18° --- Down 3° Why stabilator has a lower travel limit for ...
AIRWAYLOVER's user avatar
1 vote
1 answer
182 views

How was the 747 and DC-10's trimmable stabilizer actuated?

I was recently reading about Alaska Airlines Flight 261, a crash where understanding it in detail requires a bit of a deep dive into the trimmable stabilizer. On that particular aircraft (MD-80), it ...
GigaG11's user avatar
  • 11
2 votes
1 answer
209 views

How to develop motion model for RC plane

I'm interested in controlling an RC plane autonomously, and to do that I need a basic motion model. How would I do this? Particularly without a wind tunnel?
FourierFlux's user avatar
0 votes
1 answer
260 views

Questions with A220 control logics

I'm gonna take simulator check for new-hired co-pilots. The company will do simulator test in A220 for new-hired copilots. Their applicants have no experience in jets, have experiences only in single ...
moon's user avatar
  • 401
0 votes
1 answer
84 views

Hexacopter Vn diagram/ flight envelope/ operational envelope

I am currently intern at a company. They are making agriculture hexacopter, now there is a confusion that does the hexacopter or multicopter have a V n diagram if yes how to make one what's the ...
Karandeep Singh's user avatar
2 votes
1 answer
197 views

Can a person with cerebral palsy become a pilot?

I have mostly succeeded at everything I want in life except the one hobby I wish I could take up, and of course that hobby is flying, or I wouldn't be asking here. Background I graduated high school ...
eyoung100's user avatar
  • 123
1 vote
1 answer
283 views

Approach miniumum when I lost WAAS during approach

I have a GPS receiver with WAAS. During an LPV approach, I received an LOI message That means I only lost WAAS, not RAIM. Did I just need to change minimum to LNAV and continue the approach?
sophie's user avatar
  • 11
4 votes
1 answer
516 views

What are the "Aft Bobweights" for on a full power hydraulic aircraft?

I like military aircraft, and recently I've been researching the feel system for the control stick. It seems that there is something called bob weights to improve the feel of an aircraft. It's a ...
zarusoba10'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
2 votes
1 answer
201 views

A transfer function relating jet engine thrust to pitch angle during a phugoid motion

Crossposted on Mathematics SE I am doing a school project that requires me to find a transfer function that relates the thrust of a jet engine (which could change with time in one way or another) and ...
Faito Dayo's user avatar
1 vote
1 answer
117 views

What's the more accepted notation used to label sensors present in turbo-jet engines?

I'm interested in learning what the proper (more accepted) notation used to label sensors present in turbo-jet engines is. Came across a few examples such the ones shown below but would like to learn ...
user67034's user avatar
  • 113
5 votes
3 answers
3k views

Why is it that when autopilot is maintaining cruise, we don’t feel the changes when lift increases?

When we’re inside an aeroplane, when we’re in cruise, why is it that we don’t feel the changes in altitude, lift and the adjustments for example from the elevator on the plane as the weight is burned ...
James's user avatar
  • 87
0 votes
3 answers
276 views

How exactly is cruise maintained as fuel is burnt?

Can someone please explain how exactly cruise (I think it’s called straight, level and un-accelerated flight) is maintained for like an airliner please? I’ve read a few answers on this website for ...
James's user avatar
  • 87
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
6 votes
2 answers
3k views

Why is a flat turn less efficient than a coordinated turn?

How I understand a flat (rudder-only) turn: AOA between relative wind and the fuselage of the airplane causes a sideslip in the direction of yaw. Vertical stabilizer weathervanes into the relative ...
astroball's user avatar
-1 votes
1 answer
134 views

Human error analysis in general aviation [closed]

can anybody help me with understanding more about the human factors analysis in general aviation Controlled flight into terrain. I am researching on the topic and I would really appreciate any help in ...
Soumyajit Maiti's user avatar
1 vote
1 answer
88 views

What are the key differentiating factors between the flight control systems employed in unmanned drones and those utilized in piloted aerial vehicles?

"I've come across open-source projects like ArduPilot that are commonly used with microcontrollers like Pixhawk for unmanned aircraft. However, I'm unsure whether these systems can be adapted for ...
Rohit Anand'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
5 votes
6 answers
3k views

How to slow down while maintaining altitude

Is reducing throttle/power already enough? Or do I have to adjust the pitch as well? If so, I suppose pitching up as well? If pitching up is needed as well, is it because as speed decrease, there is ...
Hitomhi's user avatar
  • 349
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
  • 5,142
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
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
  • 403
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
  • 71
0 votes
1 answer
81 views

Can engines with a fixed nozzle in the angle of attack have the same effect as the thrust vectoring?

If the figure above represents a missile at the angle of attack and we vector resolution the thrust output from the nozzle, we can see that the thrust is divided into sine and cosine parts. Does the ...
alireza's user avatar
  • 113
8 votes
1 answer
2k views

Why is only one rudder deflected on this Su 35?

Why does the aircraft has only one rudder deflected in this picture?
George Geo's user avatar
  • 2,111
1 vote
2 answers
153 views

How to prevent altitude loss or keep flight path angle constant while doing aileron maneuver?

I am trying to perform an aileron roll maneuver for an un-manned aircraft in a simulation. The lateral control architecture is that I am controlling roll rate (stability) with aileron stick and side-...
aerovague's user avatar
0 votes
3 answers
516 views

Forward Slip - Which speed to maintain?

Which is the proper speed to be maintained during a Forward Slip? Near Vfe or Vref? Which one will let you lower with the shorter ground distance and why?
Ygor Montenegro's user avatar
17 votes
0 answers
1k views

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
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
19 votes
5 answers
7k views

What control inputs to make if a wing falls off?

If a wing is severed due to structural damage or from a mid-air collision, what is the best control input to make? I would think opposite aileron and rudder, i.e. if right wing falls off, input full ...
Cloud's user avatar
  • 13.5k
0 votes
1 answer
454 views

How to convert body frame-relative aerodynamic coefficients to wind frame-relative aerodynamic coefficients

I have a rocket flight simulator that takes in aerodynamic coefficients defined relative to the vehicle body frame axes (Cx, Cy, Cz). These are in a lookup table based on mach. I have some aerodynamic ...
Tombombadilly's user avatar
1 vote
3 answers
387 views

Why (and how) do aircraft rudders center themselves without input?

Why (and how) do almost all aircraft rudders have some sort of way of re-centering the rudder when there's no input being made? For example, if you wanted to move the flight controls (fly by wire ...
Boeing787's user avatar
  • 6,454
1 vote
2 answers
242 views

What safeguards are there against unintended inputs?

A modern passenger jet suddenly encounters some very turbulent air. The captain, who was just enjoying his toilet break, rushes back into the cockpit. Just as he's about to sit down the plane drops, ...
Bart van Heukelom's user avatar
10 votes
3 answers
3k views

A plane is flying at constant velocity in equilibrium, then pitches up. What happens?

This might be a dumb question. And I could probably work it out myself. But here goes! Assume a plane is flying along at some velocity $v_0$ at angle-of-attack $a_0$, using throttle setting $tr_0$. ...
interested22's user avatar
5 votes
2 answers
2k views

Why do some aircraft's flight control surfaces not droop when hydraulic power is taken away? [duplicate]

Analyzing a bunch of different photos of airliners sitting at Gates, I've noticed that some have flight controls that droop (due to no hydraulic power) and sometimes they stay leveled. Why is this? ...
Boeing787's user avatar
  • 6,454
2 votes
1 answer
148 views

How can angle of attack for a T-tail configuration be 21 degrees without stalling and also be flying at its trimmed condition?

I was reading a paper that looks at deep stall for T-tail configurations, and figure 2 suggests that the first trim condition for the aircraft in question occurs at approximately 21 degrees. Surely ...
caged's user avatar
  • 23
8 votes
2 answers
2k views

What is the essential purpose of making three control laws in Airbus aircraft?

Airbus has normal law, alternate law and direct law. What was the need for specifically making each of these three laws? What benefit does each one offer over the others? Also, why does Airbus degrade ...
Sachin Chaudhary's user avatar
4 votes
1 answer
436 views

Why do autopilot controllers use $\theta$ as the input signal rather than $\gamma$?

In particular, referencing how the Matlab/Simulink controller here uses $\theta$ (absolute pitch angle), rather than $\gamma$ (flight path angle). (Autopilot controller starts at 59:26) ...
Nate Poon's user avatar
-1 votes
2 answers
279 views

Controlling a plane only by shifting weight

Suppose that a plane lost the ability to use all the control surfaces on the wings (e.g., flaps and ailerons). Can the weight inside the plane be shifted to help maneuver the aircraft? For example, ...
Justintimeforfun's user avatar
3 votes
1 answer
408 views

Immobile pressure-sensitive stick [duplicate]

I was reading the Japanese sci-fi novel Yukikaze (greatly recommended btw) again and I came across a detail that describes that the stick of the fighter plane the main character is flying is fixed in ...
BryBuriya's user avatar
  • 307
14 votes
3 answers
3k views

What is the name of the pedal assembly in an aircraft cockpit?

I'm proofreading a document about rudder control systems and client insists on calling the pedal assembly under the pilot's feet the "rudder". Would this ever be used?
Chris's user avatar
  • 141
4 votes
2 answers
1k views

How do flight controls work in tandem wing configuration?

If I understand it correctly, the usual configuration with tandem wings is that the front wing has ailerons - controls the roll. And the rear wing (a bit smaller than the front one) has elevators and ...
Mark's user avatar
  • 51

1
2 3 4 5
13