Questions tagged [horizontal-stabilizer]

Questions about the surfaces that typically extend out from the left and right sides of an aircraft's tail, providing longitudinal stability and a place to mount the elevators.

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5
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3answers
108 views

Do aircraft fitted with both a trimmable horizontal stabilizer and a trim tab exist?

This question is restricted to trim on the pitch axis. Both trim tab and THS (trimmable horizontal stabiliser, a whole moving horizontal stabilizer whose movements are used as trim) are used to trim ...
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2answers
251 views

Why is a blunt trailing edge a better stabilizer at hypersonic speeds?

Here is what I read about the X-15 spaceplane: The X-15 had a thick wedge tail to enable it to fly in a steady manner at hypersonic speeds.[14] This produced a significant amount of drag at lower ...
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1answer
276 views

Why does the MCAS use the horizontal stabiliser rather than the elevators?

The Maneuvering Characteristics Augmentation System (MCAS), found, in two slightly-different variants, on the 737 MAX and KC-46, provides nose-down pitch inputs in certain very-high-angle-of-attack ...
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1answer
155 views

How much does the horizontal stabilizer on a 737 move for one unit of trim?

Inspired by this question, what exactly is the meaning of a stab trim unit? Is it exactly one degree of stabilizer movement? The 737 NG FCOMv2 (9.20.9 Flight Controls - System Description) only lists ...
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1answer
253 views

Did the pilots of Ethiopian Flight 302 trim in the wrong direction? [closed]

Looking at the accident report of Ethiopian Airlines Flight 302, it says the cut out switches were used. But the manual trim moved from 2.3-2.1? At the speed the crews eventually hit, can it be said ...
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0answers
78 views

Why is the horizontal stabilizer of the Lazair swept back? [duplicate]

Why is the horizontal stabilizer of the Lazair swept back? I understand the hinged elevators are perpendicular to the fuselage, but the horizontal stabilizer is actually swept back.
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0answers
105 views

What airfoil is used for the horizontal stabilizer of a 737? Is it inverted?

I cannot find the airfoil of the Boeing 737 horizontal stabilizer or any typical tail airfoil of a civilian aircraft.
3
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1answer
229 views

What are the maximum possible stabilizer and elevator deflections for the A320?

For research purposes I would like to know the maximum deflection angles (in both positive and negative direction) of the A320-200's stabilizer and elevator. I am trying to analyse what flight ...
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2answers
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What kind of horizontal stabilizer does a Boeing 737 have?

Does this plane have fixed horizontal stabilizers and elevators or has it been fixed with stabilators instead?
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1answer
71 views

Does the canard config have radically different controls than classic config?

Classic configuration is something like the A320: wings in the middle, horizontal stabilizers at the tail. Canard configuration is something like the Beechcraft Starship: wings at the back and ...
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1answer
660 views

How the stabilizer cutout switch functionality has changed from Boeing 737 NG to 737 MAX?

The Boeing 737 NG has stabilizer trim cutout switches marked as MAIN ELECT (left) and AUTOPILOT (right). Turning off the right switch disables automatic stabilizer trim in autopilot mode and automatic ...
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2answers
669 views

Why can't the 737 MAX's horizontal stabilizer autotrim be cut out by control yoke inputs?

According to this article, a horizontal stabilizer runaway on the 737 MAX, unlike with all other 737s, cannot be countered with yoke inputs: Older 737s had another way of addressing certain ...
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2answers
436 views

Why do the stabiliser trim wheels not move exactly in sync?

I've watched a few videos about the Boeing 737, and in particular because it's a bit of a current topic, about the stabiliser wheels in the cockpit. On some of these videos, which are often in ...
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3answers
187 views

Is there a general approach for designing a Trimmable Horizontal Stabilizer?

What is the general design flow when designing a Trimmable Horizontal Stabilizer (THS) and the attached elevator? I assume you would dimension the max. positive/negative deflections of the THS to ...
6
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1answer
5k views

What are the checklist items for a runaway stab trim on a B737 MAX 8 and MAX 9?

This is a follow up question to this question. This question is not directly related to the MCAS system in the new B737 MAX aircraft, instead, my question is about the checklist for a runaway stab ...
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5answers
396 views

Do horizontal stabilisers provide any lift?

Do jumbo and smaller airliners' horizontal stabilizers provide any lift? Apart from maintaining the aircraft's angle of attack, can they perform the dual function that includes adding some lift as ...
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3answers
267 views

Why don’t airliners use stabilizer movement to assist with large pitch control inputs?

Most large airliners not only have elevators for pitch control, but also moveable horizontal stabilizers. The elevators are used for primary pitch control, with the stabilizers being used to trim the ...
4
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1answer
249 views

Why does the Comet's horizontal stabilizer have so much dihedral?

The Comet's horizontal tail has a noticeably extreme amount of dihedral compared to that of, say, a 707: (Image by MilborneOne at Wikimedia Commons.) Note how the Comet's tail has about twice as ...
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2answers
438 views

Why the Antonov AN-225 has negative dihedral wings combined with a positive dihedral horizontal stabilizer?

I know the reason why it has negative dihedral wings, but I do not really know why it is combined with a positive dihedral horizontal stabilzer, which are the benefits this configuration provides?
4
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1answer
514 views

Why aren't there any jets with horizontal-stabilizer-mounted engines?

Looking at the spectrum of where jet aircraft put their engines, there are examples of almost every place that could conceivably used to carry a jet engine: slung under the wings buried inside the ...
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1answer
102 views

How do the vortices affect the flow of the horizontal stabilizer upon leaving the wing?

Other than the downwash effect, what other factors that affect the flow to the horizontal stabilizer? such as Dynamic Pressure? Air Flow Disturbance?
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2answers
411 views

Why are cambered airfoils used for horizontal stabilizers in some designs?

From what I know, usually NACA9/12 or similar symmetrical airfoils are used for the tail. Still some aircrafts use highly cambered airfoils for elevators. What are some advantages and disadvantages ...
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1answer
185 views

Is there a difference in stability between a tail downforce (cg ahead of ac) and a tail upforce (cg behind)?

So from what I understand, having a - 1.cg ahead of the neutral point(ac) with a tail downforce and 2.cg behind ac with a tail upforce are both stable configurations.(Please correct me if I'm ...
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1answer
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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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2answers
3k views

What is the horizontal stabilizer failure procedure?

During the final flight of Alaska Airlines Flight 261: The CVR transcript reveals the pilots' continuous attempts for the duration of the dive to regain control of the aircraft. At one point, ...
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3answers
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Why did Concorde not have horizontal stabilizers?

The Concorde did not have horizontal stabilizers or elevators. As a result, the pilots have to move fuel around the aircraft to trim it up or down, as sluggish and hazardous move. Why did the design ...
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3answers
849 views

Why would a stretch variant need a larger horizontal stabilizer?

Update and accept reason The reason for asking why would as opposed to why does is I was not aware of any previous [jetliner] stretch requiring a larger horizontal stabilizer. For example, all the DC-...
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1answer
1k views

What is the sweep angle of the Boeing 787's horizontal stabilizers?

What is the sweep angle of the horizontal stabilizers on a Boeing 787 Dreamliner? Does it have to be equal to that of the wings, and how is it determined?
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3answers
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Why do tailplanes provide down force, if not for longitudinal static stability?

We can see that most conventional aircraft have their horizontal tail surfaces arranged to provide a down force. This question asks if that is required for static longitudinal stability, and the ...
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3answers
2k views

Does static longitudinal stability require download on the tail?

After having encountered this meme too often for comfort, I ask myself today in order to have the possibility to explain the issue in detail.
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2answers
344 views

Documentation about “drag stabilized flying wings using non-reflex airfoils”?

What provides lift is the wing, but it is unstable without one stabilizer. Flying wings airfoils, or reflex airfoils, carry their stabilizer inside them, through a reversed camber of the trailing ...
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0answers
81 views

Do airliners perform a dive maneuver to reduce altitude [duplicate]

DO airliners, jumbos included, like the Airbus A380 and Boeing 747 routinely perform dive (nose down) maneuvers to descend or do they rather reduce speed and descend with the nose up? If not, why not?
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1answer
457 views

Does the wake from horizontal stabilizers merge with the wing wake?

There is already a long series of questions about the downwash and tip vortexes with nice images, but I'm going to add another one... Large airliners (A380, B747-8) have horizontal stabilizers ...
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1answer
4k views

What is hinge moment?

What is hinge moment? Why in the process of calculating it we must calculate the coefficient of hinge in 2D? Why the distribution of airfoil thickness at 90%, 95%, and 99% of the line should be ...
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1answer
806 views

Did WWII fighters have inverted airfoils for horizontal stabilizers?

Like would for example the P-47 most likely have symmetric, normal or inverted airfoil as horz. tail? Is my analysis correct?: It has a CG at 25-32% MAC according to manual. Since AC on wings is ...
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1answer
4k views

Why does the F-16 have a fixed stabilizer section inboard of the stabilators?

So, we have a F-16 chilling on the ramp, showing us its tailfeathers: Interestingly enough though, inboard of the all-flying stabilator sections, there is a fixed stabilizer section (this is quite ...
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2answers
610 views

Have there ever been forward-swept horizontal stabilizers, and what would be its advantages?

After going over one of my older questions about forward swept wings, I realize I have never seen a forwards-swept horizontal stabilizer. Do they exist? What would be their advantages, if any?
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2answers
4k views

How do elevator servo and anti-servo (geared) tabs differ?

(Community work) Image shows tab deflection direction in relation to an upward deflected elevator. How do elevator servo and anti-servo (geared) tabs differ in handling? How to decide on which tab to ...
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2answers
5k views

Why are the leading edges on the Boeing 787 made from aluminum?

Why are the leading edges of the wings, horizontal stabiliser and vertical stabiliser and the engine's inlets made from Aluminium?
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1answer
3k views

Why should the centre of mass be ahead of the centre of pressure?

Why is the centre of mass located ahead of the centre of pressure? And what would happen if centre of mass would be too close or too far away from the centre of pressure?
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2answers
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What are these holes in my Cessna 172, just in front of the elevator?

Been wondering about these for a while. Student pilot working on my PPL. When preflighting my Cessna 172 the other day, I noticed these holes just in front of the elevator. What are they for? The ...
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2answers
410 views

Has there been research into alternatives for the vertical stabilizer?

Are there some activities in research for replacing the vertical stabilizer with a turnable horizontal stabilizer? (flight direction stabilization like the birds)
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3answers
3k views

How is a horizontal stabilizer attached to the fuselage and works as a trimmable Horizontal Tail as well?

I am trying to figure out how does the horizontal stab attached itself to the plane and moves up and down? Is the HS attached by the rear spar and to the fuselage?
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1answer
850 views

Is setting elevator to certain angle equal to trimming the horizontal stabilizer?

(I was trying to understand the longitudinal stability of aircraft and how it is related to elevator) If I pull the stick back by, say 2 inches, will it have the same affect as trimming the ...
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2answers
1k views

Is trimming for constant speed equal to trimming for constant angle of attack?

My understanding of trim: When you say you have trimmed an aircraft for a constant speed, say 100 mph, you are actually trimming the horizontal stabilizer so that there are no forces on stick (or tail ...
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3answers
1k views

Is it possible to balance a tail heavy plane with a vertical prop on its tail?

I've put together a model plane in the form of an angel, and the planform is quite tail heavy (please see pic). I'm trying to balance the plane with a lifting tail prop that makes the "apparent" CG in ...
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1answer
3k views

What is the angle of attack of horizontal stabilizer?

It 'appears' that in most flights the horizontal stabilizer is set for positive angle of attack. So does this produce an 'up force' (lifting force) on tail thus making the aircraft nose-heavy? Or ...
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1answer
1k views

What difference is there between stabilizers and stabilators concerning longitudinal stability?

It is known how stabilizers affect the longitudinal stability of an airplane. What about longitudinal stability in airplanes using stabilators (all-flying tails) or trimmable stabilizers? Is it to ...
7
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1answer
378 views

Are elevator trim tabs required for an aircraft equipped with movable horizontal stabilizer?

The Bombardier C-Series aircraft has a movable horizontal stabilizer. It also has Trim Up/Down (discrete) switches in the cockpit. Is the aircraft also equipped with trim tabs? If so, when pilot ...
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3answers
4k views

Why does the DC-10's horizontal stabilizer have such a pronounced dihedral?

If you look at this picture, you'll see that the horizontal stabilizer has a very pronounced dihedral in comparison to the wings. Could somebody explain in a simple way why? I understand that a ...