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# Questions tagged [sideslip]

A flight condition where an aircraft's direction of motion is not aligned with its longitudinal axis, causing the aircraft to "slip" sideways through the air.

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4 votes
4 answers
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### What does the balance ball actually indicate?

Given answers and comments from a previous question, I realize that I need to clarify what the ball actually measure. I think it does not measure side slip but sideways acceleration, but I'm not quite ...
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-5 votes
2 answers
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### What is missing from these diagrams of the forces in slips and skids?

See these images that are widely reproduced in many different on-line ground school materials. A) Is the magnitude of the wing's lift vector illustrated correctly in each of the three cases? Should ...
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22 votes
4 answers
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### What is a skidding turn (vs slipping turn)?

I am trying to understand the concept of What qualifies a turn to be skidding or slipping how we need to give elevator back pressure if we do not want to 'slip' the turn. While browsing for answer ...
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3 votes
3 answers
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### Why does a banked aircraft create sideslip?

Below is an excerpt from Raymer (Aircraft Design) where he explains the dihedral effect. He states that a banked aircraft (due to say a roll disturbance) will have a sideslip which leads to a ...
• 616
18 votes
1 answer
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### Does slipping in turns allow higher climb rates?

Sailplanes, among others, use a cotton string to show the sideslip angle. I've often heard that while circling in thermals the cotton string should show a slight slip angle to climb faster. This ...
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5 votes
4 answers
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### 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 ...
5 votes
4 answers
704 views

### Viable to slip onto the center line?

One of the constant problems of aviation is drawing onto the center line on final. Either due to a bad rollout or due to crosswinds a pilot often finds that the aircraft is not on the center line for ...
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4 votes
2 answers
1k views

### How can using split throttles help when landing twins in crosswinds?

In General Aviation light twins, when landing in heavy crosswinds, what are some considerations to using asymmetric (or Split) throttles to induce a sideslip, to align the fuselage with the ground ...
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1 vote
2 answers
1k views

### How does sideslip indicator react during crosswind?

I will basically consider two types of sideslip indicator: the yaw string and the marble/ball inside a curved tube. I don't know the exact aeronautical term for both and I don't know if other sideslip ...
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1 vote
1 answer
149 views

### Causes of yaw in slip/skid turn [closed]

Why does the plane yaw when the rate of turn is not suitable to bank angle in a turn? In a slipping/skidding turn, there is an imbalance of centripetal/ centrifugal force. How does that cause a yaw?
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1 vote
2 answers
356 views

### At what angle-of-attack (sideslip angle) would a symmetric vertical fin plus a deflected rudder have a lift coefficient of exactly zero?

For rudder deflection angles of 5, 10, 20, 30, and 45 degrees, at what (negative) angle-of-attack does a fin-rudder combination (including dorsal fin if present) have a lift coefficient of exactly ...
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1 vote
2 answers
2k views

### Forces in a slipping turn [duplicate]

I have trouble understanding why the ball (on the turn & slip indicator) falls into the turn e.g. drop to the left when aircraft is rolled left, when in an uncoordinated turn (slipping turn). What ...
26 votes
3 answers
2k views

### Why does a T-tail produce a pitch-down moment in sideslip?

Here is something which I did not find in any book, but confirmed in several wind tunnel and flight tests: A T-tail causes a strong nose-down moment in sideslip. This can even be observed in a ...
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9 votes
5 answers
802 views

### Why does elevator input move the turn coordinator ball in steep turns?

When practicing steep turns, I'm running into an unusual phenomenon. If the airplane is losing altitude in coordinated flight and I apply aft stick pressure to pitch up and correct, I notice that the ...
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5 votes
5 answers
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### Calculate/Measure Sideslip Angle from Heading Track and Drift Angle

Is there a way to measure the sideslip angle during flight through the relationship of heading, track and drift angle? For example if you turn the aircraft into head or tailwind - does the sideslip ...
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4 votes
1 answer
2k views

### Finding Angle of Attack/Angle of Sideslip using East/North/Up Coordinates

I've got a set of data that includes: x rate, y rate, z rate (all ENU) which I'll call xd, yd, zd. roll, pitch, yaw (which I'll call ϕ, θ, ψ) roll rates, pitch rates, yaw rates I'm looking at some ...
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3 votes
4 answers
255 views

### What happens to tip vortices in a sideslip?

Say you're in a right sideslip. What happens to tip vortices? I'm fairly sure that it would just reduce the strength of the vortex (for the left wing), because there is a force trying to keep the high ...
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3 votes
5 answers
2k views

### Is drift and sideslip angle the same in the accompanied figure?

Consider the following figure: Initially aircraft is moving along dotted line. But due to wind, aircraft ground track is changed to solid line but body still pointing parallel to dotted line. I've ...
2 votes
5 answers
1k views

### Which way (if at all) do the ailerons need to be deflected in a full-rudder sideslip in a Cessna 152 or 172?

Do you typically have to maintain an aileron deflection in a constant-heading full-rudder sideslip in a Cessna 152 or 172? If so, in which direction? And why -- what is the source of the roll torque ...
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2 votes
1 answer
477 views

### Is there a regulatory maximum side slip angle for commercial aircraft?

Hi am currently trying to run Dutch roll simulations for a proposed 35 seat twin engine turboprop aircraft. I was just trying to work out what sideslip angle might be appropriate to use. Is there a ...
2 votes
1 answer
209 views

### Why does a steady-state non-zero body yaw and/ or roll rate induce side force?

An answer on ASE states The presence of steady-state non-zero body yaw and roll rate induces side force ($C_{y_p}$ and $C_{y_r}$). What is a non-mathematical explanation of why this is so? Is it ...
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1 vote
2 answers
471 views

### What causes a slip/skid turn? [duplicate]

Is the rate of turn being too low/high for a given bank angle the cause of slip/skid turn? Or is it yawing too much inside/outside turn causing an imbalance in centripetal/fugal force and thus the ...
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1 vote
2 answers
530 views

### Mushing glide vs forward slip sink rate

Source: Wolfgang Langewiesche - Stick and Rudder; An Explanation of the Art of Flying I ran across a mushing glide in Wolfgang Langewiesche's - Stick and Rudder; An Explanation of the Art of Flying ...
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1 vote
1 answer
265 views

### Does the routine flown by the Thunderbirds in the F-16 feature true sustained knife-edge flight?

Does any aerobatic routine flown by the USAF Thunderbirds in the F-16 feature true sustained knife-edge flight? By "true sustained knife edge flight" we mean that the aircraft is maintaining ...
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