# Questions tagged [yaw]

Yaw is the motion around the normal (vertical) axis of the aircraft. Use this tag to denote a question where a yaw rotation is a key element of the problem.

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### Why can't lifting line model be applied to yawed/skewed/oblique straight wing (low M)

If all the horseshoe vortices have skewed central bound vortices on the same skewed 1/4 chord line, then the trailing vortices from the downwind half span of the wing induce less on the windward ...
141 views

### How did the B2 Bomber achieve yaw [duplicate]

I came across this diagram of the B2. I was wondering how it achieved yaw. If I'm correct usually the rudder on the tail would do this, but the B2 does not have a tail. Does it have no need for yaw, ...
1k views

### Why does directional stability decrease at supersonic speeds?

As an aircraft accelerates through the transonic region from full subsonic to to full supersonic flow its directional or yaw stability decreases. What causes this reduction?
156 views

### how does the rudder work? [closed]

What do you know about yaw control and more precisely about the result caused by the rudder (R on picture)? Below the right pedal of the airplane has been depressed, and the rudder creates a rotation ...
1k views

### Is there a conventional notation or name for the slip angle?

Angle of attack is usually designed by alpha (as in alpha_prot). Is there such a conventional notation or name for other axes? I'm particularly interested in the slip angle.
406 views

### What is the difference between turn rate and yaw rate in aircraft?

Attitude heading computers generate both a turn rate and a yaw rate. How are these different from each other? Is Euler yaw rate the same as turn rate?
134 views

### Is adverse yaw ever desirable?

Is there any situation during flight where adverse yaw (yaw due to roll) is desirable?
2k views

### How is a sideslip maintained (aerodynamically)?

(Public domain image that I've modified.) The initial rudder deflection to the left creates a side force that points right and yaws the plane to the left. NASA puts it this way: For the vertical ...
71 views

### How to calculate on ground aircraft yaw rate knowing the longitudinal speed and inferred yaw angle

Please consider the following scenario: a generic aircraft is on-ground taxing at 50 feet per second (~15.25 m/s, ~29.5 knots) The pilot inferred 20 degrees of yaw How can I calculate the yaw rate ...
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 ...
9k 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 ...
1k views

### What does rudder input control in normal law in an A320?

I understand form documentation that in normal law, pedal input is not necessary to keep coordinated flight. It is merely said that using the pedals is not necessary. Later in the documentation it is ...
4k views

### Why not use the yoke to control yaw, as well as pitch and roll?

(Inspired by this question about rudder hand control on joystick-equipped aircraft.) Most civilian fixed-wing aircraft (post-1987 Airbus airliners being the primary exceptions) use a yoke (...
347 views

### On an A320, will the aircraft compensate for constant pilot rudder input?

As I understand from answers to the question What does rudder input control in normal law in an A320?: the rudder deflection is the result of the sum of pedals input and plane's FBW command in normal ...
697 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 ...
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 ...
923 views

### How can a VTOL aircraft control yaw while hovering? [duplicate]

I watched this video of a F-35B performing a flight-hover-flight transition and was pretty impressed by the fact that it was able not only to control pitch and roll (which could be, I suppose, ...
3k views

### What are the disadvantages of using just rudder to roll an airplane?

Ultralights with slight dihedral will roll and yaw on rudder input (e.g the Bloop 3, Maxair Hummer) so some don't have ailerons for the sake of simplicity. Is this kind of control input advisable, or ...
400 views

### At what angle of deflections do rudders become inefficient?

This article (picture) says rudders for ships can deflect 35Ā° max,so at what aoa does an airplane rudder lose its efficiency,at what " angle of deflection " does it start to stall ?
670 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)
419 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 ...
760 views

### How does rudder size influence its ability to produce lateral lift?

Does anyone know how the area, height and width of a rudder affect how well it provides lateral lift? I've heard that the most effective rudders are around 35% of the vertical stabiliser MAC but is ...
1k views

### What makes the F/A-XX twin-engined tailless fighter controllable with engines out?

There are operational tailless aircraft such as B-2 spirit, X-45. It seems yaw stability/control at slow speed is achieved aerodynamically, using either split elevons (B-2) or adjacent elevons ...
360 views

### Can a 737 yaw while parked due to wind?

How much wind force is required to push/rotate a 737 sideways while parked?