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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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Why do you pull back on the stick in a forward slip? [duplicate]

In a forward slip (I'm learning to fly sailplanes, if that matters), quite a lot of back pressure is needed to keep the nose up in a forward slip. Why, aerodynamically speaking, is this the case? I ...
Sanchises's user avatar
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Why does induced downwash vary across a wing in a sideslip?

in this excellent answer, it states this : A well-known effect of wing sweep is the variation of induced downwash along the span from the trailing wake that produces an additional lift distribution ...
Wyatt's user avatar
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3 votes
4 answers
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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 ...
Wyatt's user avatar
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0 votes
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199 views

Airspeed indication in a forward slip C172?

I have read several topics on the manner with two completely different answers, and just want to make sure I get it right. When slipping to the right in a C172 (right aileron, left rudder), the static ...
leha007's user avatar
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3 answers
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Simultaneous yaw damping and sideslip control of aircraft with rudder?

Yaw damping is achieved by using the rudder to generate a yawing moment that opposes any yawing motion. Also, rudder is used to correct sideslip by applying a rudder input in the opposite direction of ...
hereyougo there's user avatar
4 votes
1 answer
189 views

In a plane with airbrakes, such as a glider, how do slips and airbrakes interact?

While adding a slip to enhance my descent rate, I got to thinking that the airbrakes might be losing effectiveness as the slip twists them out of the relative wind. This thought arose because I did ...
Kenn Sebesta's user avatar
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2 votes
1 answer
177 views

Actual non-axial airflow (sideslip) for a propeller driven aircraft

I am making a propeller model for a two-engine propeller driven aircraft (like a Dornier 228). I have expanded my model to include the non-axial airflow as well. $$ $$ By non axial airflow, I mean ...
Neelabh Jyoti Saharia's user avatar
0 votes
3 answers
513 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
0 votes
2 answers
192 views

Y force of airplane in ground effect

How can I get the y force of an airplane in ground effect when using image theory? is the y force zero because of the mirror cancelling it out? bare in mind I'm talking about a case where there is a ...
MarcoD's user avatar
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4 votes
2 answers
283 views

How does conical camber decrease roll due to sideslip?

I was reading Ray Whitford's Design for Air combat and came upon a passage that said that on the SR-71 conical camber "gives a useful reduction in the otherwise very high rolling moment due to ...
Battery's user avatar
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1 vote
3 answers
200 views

Would twin-engine airplanes be safer (in case of engine failure) if had minimal dihedral?

In the specific context of the sudden failure of one engine, would twin-engine airplanes (with wing-mounted engines) be safer if designed with minimal dihedral, so that aerodynamic coupling between ...
quiet flyer's user avatar
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1 vote
2 answers
288 views

Am I slipping or am I skidding?

I'm in a shallow left bank, maybe 15 degrees. Right rudder pedal is all the way to the floor. Flight path is curving toward the right. Ball is far to the left corner of the glass tube. Yaw string1, ...
quiet flyer's user avatar
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1 vote
2 answers
448 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 ...
guy katz's user avatar
1 vote
1 answer
147 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?
guy katz's user avatar
5 votes
5 answers
3k views

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 ...
aviator9's user avatar
3 votes
3 answers
238 views

Do aircraft pitch down even at very low angles of attack (below 0°) in a strong sideslip?

I was doing an analysis of an aircraft (specifically the PZL Koliber 160 with the NACA 63A416) strong sideslip conditions (beta=30° for example) in OpenVSP at various angles of attack, and observed ...
TheEagle's user avatar
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What is a rough estimate for a sideslip angle for a Dutch Roll?

I previously asked: Is there a regulatory maximum side slip angle for commercial aircraft? Apart from a regulatory maximum, can anyone give me a rough value to assume for sideslip angle during a dutch ...
Elliot Crosby's user avatar
2 votes
1 answer
450 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 ...
Elliot Crosby's user avatar
0 votes
1 answer
469 views

What happens to Lift and Drag on aircraft (and its components) when sideslip is increased gradually from 0 degrees to 90 degrees?

I possess an Aerospace Engineering background, and work as a Aerospace structural analyst at a local firm. A portion of my job is dedicated to determining the critical conditions that the aircraft and ...
Rameez Ul Haq's user avatar
5 votes
4 answers
701 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 ...
Tyler Durden's user avatar
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3 answers
285 views

Forward slip dynamics

I am perplexed on the dynamics of the forward slip. I am illustrating here: The intended ground flight path is axis +y, and the plane is forward slipping by banking right + left rudder. In order to ...
George Menoutis's user avatar
1 vote
1 answer
260 views

Do redundant angle of attack and sideslip sensors use a voting mechanism, or do they display data directly?

In civil transport aircrafts (featured with dual/triple redundancy), how does airplane's Airflow angle (AoA/AoSS) sensor measurements read by the pilot? By using voter mechanism as used for airspeeds ...
S.Prabhu's user avatar
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12 votes
1 answer
2k views

Why do flying wires hum louder in a sideslip?

Page 50 of the Feb. 2021 issue of the EAA's magazine Sport Aviation reports that Like any good vintage airplane, the Sea Bird likes to fly coordinated, and the flying wires will sing out loud if the ...
Camille Goudeseune's user avatar
1 vote
5 answers
1k views

What causes the ball to not be centered in a slip/skid?

I've reviewed quite a few questions on this forum including Forces in a slipping turn is-this-vector-diagram-of-the-forces-at-play-in-turning-flight-correct what-does-the-balance-ball-actually-...
eball's user avatar
  • 201
1 vote
1 answer
261 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 ...
quiet flyer's user avatar
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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 ...
hereyougo there's user avatar
1 vote
2 answers
271 views

In a full-rudder sideslip in a Schweizer 2-22 or 2-33 glider, is the descent rate higher at 50 mph airspeed than at 60 mph airspeed?

Is it really true that in a full-rudder sideslip in a Schweizer 2-22 or 2-33 glider, the descent rate is higher at 50 mph airspeed than at 60 mph airspeed? Likewise, is it really true that in a full-...
quiet flyer's user avatar
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0 votes
1 answer
559 views

Why is there a a nose-up pitching tendency during a forward slip in a Cessna 172?

Why is there a tendency for the nose to pitch-up during a forward slip in a Cessna 172 (According to the TC Flight training manual)? Quote: "If full rudder is used, considerable aileron pressure ...
leha007's user avatar
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2 votes
1 answer
205 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 ...
quiet flyer's user avatar
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3 votes
3 answers
1k views

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 ...
Nick Hill's user avatar
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4 votes
1 answer
174 views

How are coefficients of equation of sideslip angle in the paper "A general Solution to the Aircraft Trim Problem" calculated?

I am sure many of you guys must have read the paper, "A General solution to the Aircraft Trim Problem" by Marco, Duke and Bernt. I am working with the turning of the Aircraft and I am not able to ...
jmoriarty's user avatar
1 vote
2 answers
523 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 ...
Flion's user avatar
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11 votes
2 answers
8k views

Why should one not slip a Cessna 172 with flaps extended?

The POH strongly recommends not slipping the AC with full flaps...why? It seems natural in a crosswind approach to allow the horizontal lift component to cancel the airmass movement across the ...
Mark Anderson's user avatar
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 ...
Flightsimrightnow's user avatar
-5 votes
2 answers
3k views

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 ...
quiet flyer's user avatar
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4 votes
4 answers
3k views

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 ...
Manu H's user avatar
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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 ...
Manu H's user avatar
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0 votes
3 answers
953 views

Is it possible to calculate lateral acceleration from pitch/yaw/roll rates?

Can you calculate an aircraft's lateral acceleration from the aircraft's yaw, pitch and roll rates? If so, how? This is to implement a digital slip indicator.
Alby's user avatar
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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 ...
synchh's user avatar
  • 131
7 votes
3 answers
2k views

Why does a turn and slip indicator matter?

I'm studying the principles of flight, and I'm having some unanswered questions in my mind regarding the turn and slip indicator. I'm reading that a turn and slip indicator displays the slip or skid ...
Julian's user avatar
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1 vote
3 answers
233 views

Is a high alpha sideslip possible and safe?

Is a high alpha sideslip possible and safe? We use a sideslip to increase drag when trying to reduce altitude before landing on a short runway, etc., which is crossing your rudder and ailerons, to ...
Fred's user avatar
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1 vote
2 answers
355 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 ...
quiet flyer's user avatar
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2 votes
2 answers
293 views

Sideslip vs Freestream Azimuth Angle

Why is the sideslip angle, $\beta$, defined as $$\beta=sin^{-1}\left(\frac{v}{|{\bf v}|} \right)$$ and not the same as freestream azimuth angle $\psi$ $$\psi=tan^{-1}\left(\frac{v}{u} \right)$$ ...
eball's user avatar
  • 201
9 votes
5 answers
794 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 ...
Romeo_4808N's user avatar
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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 ...
quiet flyer's user avatar
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-7 votes
5 answers
2k views

In which direction will an aircraft drift after taking off in a crosswind?

Assuming the pilot applies the appropriate crosswind flight controls (see below) during takeoff and rotation, and releases those flight controls after the aircraft leaves the ground, in what direction ...
Charles Bretana's user avatar
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 ...
Charles Bretana's user avatar
2 votes
3 answers
4k views

Is there a specific relation between sideslip angle and yaw rate OR how sideslip angle depend on yaw rate?

Since, yaw rate is controlled via rudder and sideslip angle can also be controlled by rudder, I want to know if there is any dependence of sideslip angle on yaw rate in fly by wire aircraft as I am ...
Swati's user avatar
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15 votes
4 answers
3k views

Is it dangerous to do a skidding turn to lose altitude without increasing airspeed?

I was taking some lessons in a light sport aircraft in South Africa a few years back, my instructor taught me something which I had never seen or heard of before or since. We went through an emergency ...
alex's user avatar
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5 votes
4 answers
4k 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 ...
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