# 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.

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### 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 ...
7k 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 ...
7k 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; ...
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?
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### 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 ...
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 ...
145 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 ...
813 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 ...
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 ...
422 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 ?
992 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 ...
468 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 ...
402 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 ...
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### 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. ...
537 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 ...
365 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 ...
302 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:...
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### 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 ...
302 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 ...
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### 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?
256 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 ...
183 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 ...
560 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 ...