Questions tagged [rudder]

A directional control surface, usually mounted on an aircraft's vertical stabilizer, which causes an airplane to yaw (and, sometimes, roll) to the left or right when deflected.

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11
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2answers
7k views

Are the functions of ailerons and rudder similar?

The ailerons help the plane to bank left/right by increasing lift to one wing and decreasing in another. Likewise, the rudder also helps in turning the plane by yawing and deflecting the nose right/...
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4answers
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Why are the F/A-18 rudders deflected in opposing directions during takeoff?

Looking at some videos and photos of F/A-18 Hornets and Super Hornets taking off from carriers and from airfields, I recognised that the left rudder is pointing right, and the right rudder pointing ...
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3answers
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Why do aircraft have a crossover airspeed, and why does it increase at higher vertical load factors?

According to the NTSB accident report on the crash of USAir Flight 427, all commercial aircraft have a crossover speed (the speed at which the maximum rolling force from the aircraft’s ailerons and ...
13
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2answers
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Why isn't it possible to locate the rudder in front of an airplane's center of gravity?

Why isn't it possible to locate the rudder in front of an airplane's center of gravity? Specifically how does this relate to the stability derivative?
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2answers
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What are the pros/cons of all-moving rudder?

All-moving flight control surface (stabilator instead of a stabilisator+elevator) are common on supersonic aircrafts but this is usually used for pitch control only. For rudder, this design (one all-...
14
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4answers
14k views

What is the advantage of combining the rudder and brake pedals in aircraft?

I've read about several aircraft having their rudder and brake pedals very close together. To me this seems confusing and prone to error. It looks easy to mistake the rudder / brake pedals and ...
15
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4answers
9k views

Does the rudder need to be held throughout a coordinated turn?

It's widely known that to perform a coordinated turn, rudder must be turned as well as ailerons. My question is what to do after the desired bank angle is achieved? In the Airplane Flying Handbook we ...
16
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6answers
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What's the purpose of yawing?

I've never understood the purpose of yawing, i.e., rotating around the vertical axis by activating the rudder. Provided that airplanes have ailerons that allow banking (used for turning), why do they ...
10
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4answers
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How is rudder used in a aileron roll?

Rudder is usually used to maintain coordinated flight. When banking to one side to begin a turn, the rudder is usually pushed towards that side. I guess this is still valid in inverted flight: in ...
2
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1answer
2k views

Can some planes turn using just the rudder or without banking? [duplicate]

I know you use the rudder when banking to keep the plane in the correct orientation, but is it possible, when making a slight turn with say a small private cessna, could you just use the rudder to ...
27
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3answers
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What is the advantage of the two-part rudder and how does it work?

I saw that some aircraft's rudder is composed of an upper rudder and a lower rudder (B727, A380, ...) as illustrated: Image Source I wonder how does it work compare to a normal rudder and what are ...
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4answers
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Why do the F/A-18 and the F-22 Raptor have horizontal stabilizer as well as canted rudders for pitch control?

F/A-18, F-22 Raptor have a horizontal tailplane as well as canted rudders? Why can't the horizontal tailplane done away with (as in the F-117) and have only the ruddervators for pitch control?
14
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4answers
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Do modern aircraft require rudder input in order to perform a coordinated turn?

With today's state-of-the-art electronic systems in modern aircraft, do aircraft equipped with autopilot systems, still require pilot rudder input to keep a turn coordinated? For the context, I'm ...
13
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2answers
5k views

How do the Beech Bonanza's ruddervators work?

How do the Beech Bonanza's ruddervators work? When the yoke is pulled completely back, is it possible to use rudder?
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4answers
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Did any aircraft ever use stick twist for rudder control?

Did any aircraft ever use stick twist for rudder control like some joysticks for video game flight simulators?
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2answers
827 views

Can perfect turn coordination automation be achieved by linking rudder to aileron?

I was reading about the ERCO aircraft which apparently has a rudder-aileron linkage system that enables co-ordinated turns without the need for explicit rudder inputs. I've heard of Piper's having ...
6
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4answers
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Why don't airliners have rudders on the winglets?

There are a couple airplanes out there that use the winglet as the rudder, but why doesn't the winglet have a rudder on it to increase the turn of the aircraft?
6
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1answer
892 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 ...
27
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4answers
5k views

Did Wolfgang Langewiesche ever change his mind about rudder pedals?

I get the feeling that if aviation was a religion and had a holy book, that book would be Stick and Rudder. Mostly because it's often spoken of with great authority by people who have never read it. ...
5
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4answers
3k 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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2answers
213 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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2answers
2k views

How can a flying wing style airplane recover from a spin without a vertical stabilizer? [duplicate]

I fly a Cessna C-172, and if I have any bank when stalling, I have to use rudder to level the airplane. If I use aileron, the bank angle will increase and bring the airplane into a spin. My question ...
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3answers
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Why does the B-52 have such a tiny rudder?

The B-52 (aka Stratofortress, aka Grey Lady, aka BUFF) has a minuscule rudder for an aircraft of its size and wing-mounted engine placement: Compare to, for instance, the rudder on a 747: The B-52’s ...
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5answers
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Can an aircraft be turned without rudder input?

Is it possible for pilots to make a right or left turn, using just the ailerons and without rudder input in all airliners? If not why so, for what reason?
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1answer
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How is a light plane's nose wheel straightened during retract?

Assuming a light aircraft has direct cable linkage to the rudders, during taking off in a very strong crosswind with the pilot correcting with hard rudder, what keeps the nose wheel from remaining off ...
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3answers
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How much rudder input does a Cessna 172 require during the take off roll?

I am part of an open-source project developing a simulation of a Cessna 172P. We are tweaking our flight dynamic model at the moment and we are looking for feedback from people with real life ...
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1answer
2k views

Does the A320 Trimmable Horizontal Stabilizer automatically reset after landing?

Does the A320's Trimmable Horizontal Stabilizer (THS) automatically reset after landing? If so, is there any condition where it doesn't? And what about the rudder trim? I'm asking because I'm ...
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4answers
218 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 ...
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8answers
14k views

Why is using opposite rudder and aileron necessary in left turn for coordination?

This question goes against everything I've read or heard with the exception of a suggestion from my CFI in my last flight lesson, so I was hoping to get some clarification: During a left turn into ...
10
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1answer
1k views

Are there any incidents caused by rudder failure in Military jets?

Based on this question about the rudder position of the F/A-18 Fighter Jet. Quote from the user Rhino Driver: The logic has its limits though and if the pilot exceeds 14 AoA in a landing mode (...
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3answers
3k views

Do pilots use the pedals in flight on planes with a sidestick (Airbus)?

Do the pilots flying sidestick aircraft with fly-by-wire control systems, such as the Airbus A320, use the rudder pedals while in the air? Or does sidestick input affect both the rudder and the ...
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2answers
11k views

What happens after a rudder hardover?

I'm sure many of you are familiar with "rudder hardover", where an aeroplane's rudder deflects to an extreme position - full left or full right. Many of you will be aware that such an event, caused by ...
6
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4answers
955 views

Do aerodynamic forces and moments change aircraft pitch and yaw in the same way?

Several questions on the Aviation SE site have dealt with the question: can the rudder alone turn the aircraft: This one, which was marked a duplicate of this one, which was itself marked as a ...
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2answers
2k views

Why does the A320 use the rudder for lateral control in mechanical law?

When the Airbus A320’s flight control system is operating in mechanical law (the simplest and lowest-tech of the A320’s flight control laws, where deflections of the pilots’ joysticks are transmitted ...
6
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1answer
669 views

Why are some vertical stabilizers painted 'after' installation?

I recently watched the Airbus videos on making the first PAL and Air China A350s. PAL’s vertical stabilizer was painted before being installed, as explained in 'Why are the tails always painted, but ...
5
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1answer
427 views

Testing control surfaces pre flight; what feedback does pilot recieve?

During taxi / pre-take off I see a lot of commercial airliners test the deflections of their various control surfaces like the rudder, ailerons etc. What's the feedback received in this operation i....
5
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3answers
679 views

How do I keep coordinated on a windy day?

I've noticed on windy days that keeping the aircraft coordinated can be difficult -- the ball will tend to bounce back and forth in the turn coordinator, and I will find myself "chasing" it with the ...
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2answers
1k views

How to reduce altitude in a passenger jet without gaining forward speed in an emergency?

Assume the pilot is flying too fast and high for an emergency landing. What movement of the control surfaces must they apply to land the aircraft safely on the runway? I heard this type of manuever is ...
2
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1answer
429 views

Can you turn a large airliner using only rudder input? [duplicate]

Is it possible to turn a large jet like the Boeing 747, Airbus A380 or other airliner using only the rudder, i.e. without using the ailerons on the wings? Will it take longer to turn to a new heading?...
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1answer
98 views

Why were early AFRP A300/A310 rudders prone to delaminating?

Reading the TSB report about that time an A310's rudder flew the coop, I came across this piece of background information (section 1.12.9.1, History of Earlier Design Aramid Fibre-Reinforced Plastic ...