Questions tagged [roll]

Roll involves rotation around the longitudinal (front to back) axis (e.g., a barrel roll involves a complete 360 degree rotation on this axis). Use for questions about this particular maneuver in flight.

Filter by
Sorted by
Tagged with
16
votes
7answers
8k views

How is a confusion possible between Western and Russian Attitude Indicators?

Yesterday I watched a documentary on Crossair Flight 498 accident. One of the factors that might have contributed to the accident was the confusion of the pilot on interpreting the attitude indicator; ...
6
votes
3answers
2k views

What is the direction of the sideslip induced by roll on a conventional aircraft?

For the sake of this question let's assume that the considered aircraft is an A320. The question is what is the sign of the aerodynamic $C_{n_q}$ coefficient? In another word, when the aircraft starts ...
14
votes
2answers
2k views

What causes a plane to lose its roll momentum

I am currently developing a flight simulator but there is one force I can't figure out how to simulate using real world physics. When the pilot pushes the stick to the right, the plane will reach a ...
0
votes
1answer
97 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 ...
1
vote
0answers
116 views

How is roll control achieved for the space ship two?

When looking at scaled composite 339 space ship two I fail to see control surfaces on the trailing edge of the wing. For me, it seems that the only moving surface on the wing is the feathering ...
4
votes
1answer
416 views

Are there roll control devices other than ailerons?

With the little that I've learnt about aeroplanes, I know that the aileron is the control surface that a pilot use to roll the plane by decreasing the lift of one wing and increasing the lift of the ...
1
vote
0answers
50 views

Did the Wright brothers patent their Wing Warping method in Germany?

I know that the Wright brothers patented their Wing Warping method for controlling the roll of a plane or glider in Great Britain, France, United States, Austria, Italy,... but did they obtain a ...
1
vote
1answer
129 views

How does the load factor vary when the aircraft pitches up/down?

I know that when an aircraft starts rolling, it's load factor increases. But can anybody explain how does load factor vary when the aircraft pitches up/down? Does it increase/decrease?
7
votes
4answers
1k views

What costs less energy? Roll or Yaw?

Let's say you want to perform a turn anywhere from 1 to 90 degrees. Which will cost less energy? A bank or a yaw? Using the rudder does produce extra drag, because the control surface is deflected ...
8
votes
6answers
5k views

Why do planes need a roll motion?

Isn't only pitching up/down and yawing right/left enough for travelling from one location to another?
15
votes
7answers
5k views

What is it called when you roll without yawing or pitching?

My instructor made me do an exercise that consists of banking the sailplane left and right around 30 degrees without moving from the axis. I need to aim for a specific point, and start with the ...
5
votes
3answers
431 views

How long can a commercial airliner fly at 90deg roll?

For how long can a commercial airliner fly at a 90deg roll angle ? Or can it at all ?
14
votes
6answers
8k views

What are the exact meanings of roll, pitch and yaw?

I lack some 3 dimensional understanding. What are these angles referenced to? For example, R, P, Y all start from 0, plane is flying horizontal, then it inclines its nose by 90 degrees, moving ...
1
vote
3answers
332 views

How Helicopters Change Attitude (Gyroscopic Precession or Thrust Vector Tilt)

I am trying to determine how helicopters pitch and roll (i.e. change attitude). I have heard two explanations. 1) Pitch/roll change is achieved by tilting the tip path plane and therefor tilting the ...
7
votes
1answer
151 views

What is the axis of rotation in a high alpha roll?

When doing an aileron roll at a high alpha (say 25 degs), which axis will the aircraft rotate about? Is it the incoming air-stream vector or is it more the body X axis? And does the pitch inertial ...
1
vote
2answers
200 views

Is an Aileron Roll Easier Done Opposite The Rotation Of The Plane's Propeller?

We all know helicopters have tail rotors because they would spin out of control thanks to Newton's third law. That got me thinking, would a single propeller plane have an easier time doing an Aileron ...
4
votes
4answers
644 views

Why is “proverse” yaw better than no yaw?

Why is the tendency to yaw in the direction of the roll more desirable (since it's the "proverse" yaw) than the lack of yaw in response to roll? Is it even possible to have no yawing tendency at all ...
4
votes
0answers
311 views

What is the cause of this roll oscillation during BA492 go-around? [closed]

Earlier today, BA492 aborted a landing at Gibraltar due to a strong tailwind, according to this article. Videos of the go-around show the Airbus A320 undergoing pronounced oscillation in the roll axis:...
2
votes
1answer
363 views

What's the relationship between aileron deflection and roll moment?

I'm wanting to build a laterals-only kinematic model in MATLAB considering only the ailerons for control inputs and was wondering if anyone has a rough guideline for the relationship between their ...
1
vote
3answers
653 views

Why does an aircraft's nose tend to pitch downward at higher bank angles?

In the usual aircraft configuration, the center of lift is located behind the CG producing negative pitch moment (the horizontal stabilizer counteracts it by producing downforce - positive pitching ...
5
votes
2answers
506 views

Flight physics for a roll [closed]

I am working on a pet project to write a game with flight physics. It will not be a simulator but instead much simpler. What I have done so far I have created winged components that generate lift ...
7
votes
3answers
1k views

Does “pendulum effect” apply to hang gliders or any aircraft?

In discussion of aircraft roll stability in FAA paragraph on dihedral effect and in keel effect and in Why are high wing aircraft more stable the question of pendulum effect arises. This is usually ...
5
votes
3answers
1k views

What is the name for yaw, pitch and roll together?

What is the name for yaw pitch and roll all together ? I've heard CMD used to refer to all of that information but don't know what it stands for. Is CMD correct? if so what does it stand for? is ...
6
votes
5answers
868 views

How to correct a roll due to turbulence?

I fly a Piper Cherokee 180 (PA-28-180) in an area that has frequent turbulence. When turbulence causes the aircraft to roll to one side I usually try to correct by using aileron and rudder in the ...
4
votes
2answers
2k views

What is the direction convention for Roll angle?

This page from Wikipedia says: A positive rolling motion lifts the left wing and lowers the right wing. Which means that if an aircraft has a roll of +20 degrees, it would bank towards the right. ...
3
votes
1answer
2k views

How I determine numerically the roll rate of an aircraft?

I'm a Spanish student of aerospace engineering and I'm doing my final bachelor work that consists in designing an unlimited aerobatic plane, and I wonder if it is possible to calculate an ...
0
votes
2answers
632 views

Would An-72-like (or any anhedral wing multi-engine aircraft) cruising at high speed, roll counter intuitively right, if left engine suddenly dies?

Assuming low angle of attack & anhedral wing configuration. (and as a consequence of natural left yawing moment)
4
votes
1answer
416 views

Why does increasing thrust on one engine make the plane roll and not yaw?

If you increase the thrust on the right engine, the plane rolls to the left. But why? And why does the plane roll to the right and not yaw to the right? Note: I am not a pilot, nor have I followed ...