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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7
votes
3answers
696 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 ...
1
vote
3answers
135 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 ...
1
vote
2answers
114 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 ...
2
votes
2answers
108 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 $\psi$ $$\psi=tan^{-1}\left(\frac{v}{u} \right)$$ ...
2
votes
5answers
581 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 ...
2
votes
3answers
2k 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 ...
16
votes
4answers
2k 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 ...
4
votes
4answers
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 ...
9
votes
1answer
822 views

What is the relationship between the UH60 Blackhawk stabilator function lateral sideslip and pitch coupling?

I'm having a hard time understanding the correlation between the wind gusts (where are they coming from, what are they affecting) and why, in a nose left situation, the stabilator is driven down. I ...
17
votes
1answer
826 views

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 ...
3
votes
1answer
349 views

In a non-symmetric turn, how do the side slip angle and thrust side slip angle affect the equations of motion?

I'm doing a problem on Flight Mechanics in which a banked turn is performed. The center of gravity of the aircraft is always within an horizontal plane. In order to write the dynamic equations, I ...
6
votes
2answers
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 ...
25
votes
3answers
1k 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 ...