Aileron control system is used for the deflection for controlling aircraft horizontal, and generally the upper offset distance of one side aileron is from than another The lower offset distance on side is from big, and differential aileron can make parasite drag caused by inclined aileron offset resistance caused by down-aileron, favorably In reducing inverse driftage, ensure flight safety. The airplane is controllable around its lateral, longitudinal, and vertical axes by. . Note: For the learning process any Dual Rate settings must be disabled, to ensure that the maximum control surface travels are learned. This yaw moment counters the desired yaw motion. , produce an equilibrium state) for all required states in the flight envelope. g. Primary control systems. Either. PID (proportional, integral, differential) control is one of the most mature and widely used control algorithms in satellite attitude control system. the system. I have a couple of models that require aileron differential; a notable one being a Hobbyking Lancaster. Adverse yaw is the natural and undesirable tendency for an aircraft to yaw in the opposite direction of a roll. Power Control Two (PC-2) driven by the right engine, and a Utility system which contains two pumps, one on each engine. Control surface rigged such that the aileron moving up moves a greater distance than the aileron moving down. tilting the main rotor disk in the desired direction. Joseph's College; Course Title RECREATION 253; Uploaded By LieutenantExploration3201. Control Surfaces. 3. On my MZ-24 I used the dual rates/expo function to control rates in each phase and differential to control differential the same way I do on the MZ-32. Study with Quizlet and memorize flashcards containing terms like Primary flight controls, Ailerons, Rudder, Elevator/Stabilator, Secondary flight controls and more. Ailerons are used to control a plane’s longitudinal axis by altering the lift generated by each wing, with a pilot controlling the ailerons using a control wheel in the cockpit. The elevator, which controls the pitch of the aircraft through the lateral axis. They are controlled by turning the yoke or stick left or right in the cockpit. Craig, The Futaba 351 is a single axis twin output gyro - so unless you are only one servo for both ailerons, this is the one you want to use. Therefore, in order to execute a good roll you have to have more throw in the up position than in the downDescription. 257 studied the influence of flap camber on the wing flutter bounds, and designed an LQG compensator to control the flap deflection to actively suppress the aeroelastic response. You can see this nicely on the control diagram for the B-24 . Learn the definition of 'differential aileron'. Differential deflection of the ailerons changes the air flow over the wings in such a way that a roll moment on the aircraft is generated. Control is defined as the process to changing the flight condition from one trim condition (e. Control Centering: Fly straight and level. When one aileron is deflected upward, the opposite side goes downward. When the rudder pedals are depressed, the ruddervators move differently and act as a rudder. In this case, since the raised aileron has as much or more surface area exposed to the airflow (thus increased drag) than. This movement is referred to as "roll". 71- If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move A- up and the elevator will move down. ProTrim in-flight adjustment of rates, expo, mixes and differential. The extra upward aileron movement produces more drag change than an increase in AOA on the downward aileron. , An airplane that has a tendency to gradually increase a pitching moment that has been set into motion has. Ailerons are located at the rear side of aircraft wings. assist the pilot in moving the control surfaces. (8227)-Wing dihedral, a rigging consideration on most airplanes of conventional design, contributes most to stability of the airplane about its?, 17. movable control surfaces on a V-tail airplane that are controlled by both the rudder pedals and the control yoke. Sounds like a really fancy way to avoid using aileron differential! It does sound like it would work though as you've described. Differential control on an aileron system means that A. a wall at the end of a roof with a single slope, as that of a church aisle. Ailerons are used in pairs to control the aircraft in roll (or movement around the aircraft’s longitudinal axis), which normally results in a change in flight path due to the tilting of the lift vector. This causes the airplane to roll to the left or right. Figure 5 is a plan view of the majorpor p tion of the main plane of the amphibian, the structural members of the plane and the aileron control element being shown in dotted lines. Forums; Magazine; Blogs; Classifieds; Places; More; Search; Sign Up | Log InWhen two aileron servos and the flaperon function are used, adverse yaw can be lessened by programming a small amount of differential aileron travel (for example, approximately 5° less down aileron than up), consequently improving control and producing cleaner axial rolls. Ailerons change a wing’s AoA; lowering an aileron increases the wing’s AoA. As usual, aileron reversal or the blocking phenomenon of multijoint fixed ailerons is a hard nut to crack. Differential Ailerons With differential ailerons, one aileron is raised a greater distance. B64C13/00 — Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes. Going on to talk about the role of ailerons in a spin. 8, 1925. 9. The ailerons, elevator (or stabilator), and. Differential ailerons function in the same manner as symmetrical ailerons except that the upward deflecting aileron is displaced a greater distance than is the downward deflecting aileron. A hinged control surface on the trailing edge (rear side) of an airplane wing near the tip, the aileron moves up and down and controls the direction of a rolling turn. Generally, flight control balance condition may be determined by A. 75 inches above the wing and 1. co. That is, the ailerons are responsible for one wing descending and one wing rising. A raised spoileron also increases the drag on the wing where it is deployed, causing the aircraft to yaw. A total of four ailerons are attached to the main wing and grouped into inner. B- down and the elevator will move up. pitch, lateral. 5. The feel trim actuator performs two equally important tasks: it establishes the zero force position of the control stick and provides the pilot with an artificial feeling of maneuvering stick force. The construction of the control surfaces is similar to that of the stabilizers; however, the movable surfaces usually are somewhat lighter in construction. With this type of aileron, when pressure on the control stick or wheel is applied to one side, raising one of the ailerons, the leading edge of that aileron (which has an offset hinge) projects down into the airflow and creates drag. Spoilerons roll an aircraft by reducing the lift of the downward-going wing. The way an airplane banks is by deflecting its ailerons. an increase in drag on the descending wing. This control method may call for control inputs that. YOUR MODEL IS EXPERIENCING ADVERSE YAW IF: The model skids through turns. Differential ailerons function in the same manner as symmetrical ailerons except that the upward deflecting aileron is displaced a greater distance than is the downward deflecting aileron. Ailerons connected to the rudder to reduce adverse yaw. BTW, the "yoke" (or "yolk" of the OP) is the big control system part hidden behind the panel that connects the control wheels and their shafts to the elevator and aileron systems. Use transmitter trims for hands off straight and level flight. In the past 10 years, scholars have begun to pay attention to the time delay in aeroelastic control systems. August 31, 2020. Silly me I thought have thought about it more. Differential ailerons. Considered as a generalized fluid control surface, rudders, in particular, are shared between aircraft and watercraft. The extended aileron forward end increases drag and subsumes the rudder function in the turn, while the aileron rear end produces drag and airflow redirection to reduce lift on the wing. uk. The nose swings out of the turn. distance than the other aileron and is lowered for a given. Two Aileron Types. H. . Buffeting is the intermittent application of forces to a part of an airplane. With this type of aileron, when pressure on the control stick or wheel is applied to one side, raising one of the ailerons, the leading edge of that aileron (which has an offset hinge) projects down into the airflow and creates drag. ”. Differential-Type Ailerons - raise an aileron more than one is lowered . 2 Earth Axis System There are two earth axis systems, the fixed and the moving. 71- If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move A- up and the elevator will move down. This would necessitate a major alteration of which I have not been able to figure out a simple solution. The angle of incidence is that acute angle formed by. Differential thrust can be used for directional control on distributed electric propulsion aircraft. Study with Quizlet and memorize flashcards containing terms like A reduction in anti-torque thrust will cause the. wing flaps, leading edge devices, spoilers, and trim systems. With differential ailerons, one aileron is raised a greater distance than the other aileron is lowered for a given movement of the control wheel or control stick. An ideal behavior would be one that goes to zero as time goes to infinity. Ailerons are used in pairs to control the aircraft in roll , which normally results in a change in flight path due to the tilting of the lift vector. distance than the other aileron and is lowered for a given. roll, longitudinal. 0*aileron*(-2. . Ailerons are mounted on the outboard trailing edge of the wings. The pilot changes the lift each wing produces to roll the aircraft in. It’s very difficult to roll your model in a straight line. Differential. This part is easily rigged with a couple. during inspection of the flight control system of an airplane equipped with differential-type aileron control, side-to-side movement of the control stick will. a part along the back edge of an aircraft's wing that can be moved to help the aircraft turn or…. A Flight Control Lock (sometimes referred to as a Gust Lock) is a means by which control surfaces on an aircraft not in flight can be prevented from random movement caused by wind, jet blast or propeller wash and thus possible damage to the surface, attachment points or control system. The airframe is the basic structure of an aircraft, design to withstand aerodynamic forces and stresses imposed. However, note that the use of a modal basis is not a. C. 2. nose into the wind. ( I think the first aircraft to use this technique was F-15, where it was implemented using mechanical linkages in the flight controls). The top sector is the aileron bus sector. Typically, the downward-deflected aileron creates more drag than the upward-deflected one, which causes adverse yaw (that is, the nose moves opposite the intended direction of turn). My flight school had three different Warriors and only one had the springs. 29. Excessive wear on both of the sides of a control cable pulley groove is evidence of. the up travel is more than the down travel. Adverse yaw is the tendency for the nose of an airplane to yaw in the opposite direction when an airplane banks its wings for a turn. Applying this technique to the airplane flight dynamics near stall, a new rolling mechanism is discovered through nonlinear interactions between. At very high AOA (where control stick was aft), left/right deflection would cause mostly differential stabilator. A. 1. The ailerons are attached to the outboard trailing edge of each wing and, when a manual or autopilot control input is made, move in opposite directions. The aileron shape can be, in this way, adaptively controlled to realize camber variations. Aileron. Move the ailerons further outboard to the wing tips. A methodology consisting of an aerodynamic data acquisition module and a non-linear six. What is a differential aileron system? With differential ailerons, one aileron is raised a greater. Prior art keywords aerofoil aileron shafts shaft rock Prior art date 1929-12-30 Legal status (The legal status is an assumption and is not a legal conclusion. Most airplane manufacturers use differential aileron control. The trim tab reduces hinge moment and control surface efficiency. Increases force needed by. You might also hear this setup being called differential ailerons. This somewhat mathematical term aims to describe the reaction of an airplane to a given aileron input, for the moment ignoring the coupling effects (which we deal with later). The FBW system evolved as a way to reduce the system weight of the hydromechanicalsystem, reduce maintenance costs, and improve reliability. Since we live in a three dimensional world, it is. This principle is demonstrated in Figure 1. DIFFERENTIAL AILERONS With differential ailerons, one aileron is raised a greater distance than the other aileron is lowered for a given An aircraft 'rolling', or 'banking', with its ailerons. (8216)-The acute angle formed by the chord line of a wing and the relative wind is known as the?, 16. This block takes the input u and produces the output α. l F06 Why is it generally necessary to jack an. 30 or 30%). The purpose of spring tabs or servo tabs is to. B -. this creates excess drag in the direction to the "outside" of the turn, so aileron differential is used to. Adverse yaw is the tendency of an airplane, when turning and banked, to go the opposite direction. Pulley misalignment. Not with a flying wing!!!!!! You can create differential elevon by having standard motion and giving a bit of up elevator!!!!!! If my JR allows differential in mix mode, it would only have the effect of pitching when you roll. View full document. Adverse yaw is the natural and undesirable tendency for an aircraft to yaw in the opposite direction of a roll. Mechanical Flight Control System. 2. Ailerons. 1. This adverse yaw can also be prevented by the use of, Frise ailerons During inspection of the flight control system of an airplane equipped with differential-type aileron control, side to side movement of the control stick will cause A each aileron to have greater up travel (from the streamlined position) than down travel. As the total servo throw is decreased, the proportion of play, or slop, in the control system is effectively increased. So - my current setup is 10% aileron differential and aileron to rudder mix about 10% to manage yaw. There is actually less aileron throw with the flaps down. uk. Aileron. 20 fully-proportional channels. It is also much less efficient at producing roll. Servo power is effectively reduced when the total servo movement (termed travel volume by Futaba) is reduced. and more. In its most basic form, a pilot could enter what is called aileron differential, which means that the up travel of a given aileron will be greater than the downward travel, which for most. drag decreases on the outer wing. The ailerons are the hinged part of an airplane wing. Yaw corrections are then done with aileron to rudder mix to keep the nose straight with the same wing rocking inputs. Ailerons are one of the three primary flight control surfaces and are used to control the aircraft’s rolling motion. In this paper, by taking advantage of the strong leaning and intelligent. Wind tunnel. Though not entirely eliminating adverse yaw, the "differential type" aileron system raises one aileron a greater distance than the other aileron is lowered for a given movement of the control stick or wheel. This produces. Even with differential you want to have a light touch and give the model. Typically, an elevator on the horizontal tail is used to control the pitch. The purpose of spring tabs or servo tabs is to. In control an aircraft safely during ight. The relationship between wing planform, aileron placement, and lift distribution is studied. Roll or bank is the aircraft’s movement about its longitudinal axis. Frise Type Ailerons. The amount of differential is sufficient to balance the drag between the ailerons, thus eliminating the yaw effect. Why is it generally necessary to Jack and aircraft in doors for weighing. Provided that your servo is directly ahead of the control. Elevator, aileron rudder. The up travel is more than the down travel. . Fig. This balancing of the drag forces helps minimize adverse yaw. Aircraft Systems and Aviation – Concorde-1 ; Aircraft Maintenance Questions and Answers – Aircraft. The vertical flight of a helicopter is controlled by? Collective pitch changes. Excessive wear on both of the sides of a control cable pulley groove is evidence of. 13-If control cables are adjusted properly and the control surfaces tend to vibrate, thecan even cope with differential or unequal travels which are programmed in the mixers. BEE/VDE/V @MQQWJ United States Patent AIRCRAFT WING AND AILERON CONTROLS Kermit E. 3°. This would necessitate a major alteration of which I have not been able to figure out a simple solution. Loss of Control is definedas excursion beyond the allowable flight envelope and is often a consequence of upset condition if improper maneuver is implemented by the pilot. Here are the two most common designs: 1) Differential Ailerons: One aileron is raised a greater distance than the other aileron is lowered. Primary control systems. Movement around this axis is called ‘rolling’ or ‘banking’. Discussion Aileron Differential? Electric Plane Talk. The amount of rudder control required is greatest at low airspeeds, high angles fo attack, and with large aileron deflections. Placing a piece of cloth around a stainless steel control cable and running it back and. When the ailerons deflect. Differential Aileron Source: fly-ga. There are three sources of adverse yaw: Difference in induced-drag due to ailerons: down wing aileron reduces lift while the up wing aileron increases lift, which generates a difference in induced drag in each wing. For most designs, though, the trailing edges of the flap, wingtip and aileron should fair together to form a straight line or. *C- down and the elevator will move down. Turning control stick/yoke right causes the right aileron. J. Consists of a mechanical circuit and a. 8-1). g. Finite element analyses were assessed for properly sizing the load-bearing structure and actuation systems and for. The up aileron produces extra parasite drag to compensate for the additional induced drag caused by the down aileron. Ouyang et al. Select a Model Memory using Model SEL in the SYSTEM Menu. Rudder and ailerons are neutralized in an established turn until the pilot rolls out with aileron and rudder (green arrows). Wireless trainer function. This movement is referred to as "roll". Control roll about longitudinal axis. An example of a moving earth axis system is an inertial navigation platform. This means that if one aileron is rotated 10° TEU, the opposite one will rotate 7. The F-15 control system is powered by three separate hydraulic systems: Power Control One (PC-1) driven by the left engine. 4. What differential does, is counteract this relative angle during the aileron input, so that the "Spiral" tendency is reduced. In one, the ailerons are jammed while deflected an equal amount in the normal, opposite directions. Differential ailerons. 1) Differential Ailerons: One aileron is raised a greater distance than the other aileron is lowered. . Aileron . Forums; Magazine; Blogs; Classifieds; Places; More; Search; Sign Up | Log InNational Advisory Committee for Aeronautics, Technical Notes - A Flight Investigation of the Reduction of Aileron Operating Force by Means of Fixed Tabs and Differential Linkage, with Notes on Linkage DesignAerodynamics - Aileron Differential - a coordinated turn requires all 3 controls. The exception is when the airplane has a flat-bottom wing. See Page 1 This aileron control effort is very reasonable and achievable if the ailerons are assumed to have instantaneous response characteristics by neglecting the lag from actuators or hydraulic systems. Preview. A full length aileron is more drag than a tip length aileron when deflected. An aircraft 'rolling', or 'banking', with its ailerons An aileron and roll trim tab of a light aircraft. This produces. The bottom sector is the aileron control tab sector. Elevators, spoilers and rudder are hydraulically powered and designated the Powered Flight Control Sur-faces (PFCS). Ailerons connected to the rudder to reduce adverse yaw. On the outer rear edge of each wing, the two ailerons move in opposite directions, up and down, decreasing lift on one wing while increasing it on the other. If the wheel is rotated to the right, the right cable is pulled and the left one is relaxed. , An airplane that has a tendency to gradually increase a pitching moment that has been set into motion has. During inspection of the flight control system of an. It is located on the outboard section of each wing and works in tandem with other control surfaces to control the aircraft’s roll during flight. Because of the need for both roll and high lift from the same set of surfaces, the flaperon symmetric deflection is limited by the need to retain some capability for roll control. If say I bank left and the fuselage angles down is this to much differential or not enough? less down or more down to correct. The ailerons become less effective whith the flaps down and not because of lower airspeed. Differential ailerons With differential ailerons, one aileron is raised a greater distance than the other aileron is lowered for a given movement. Unlike bigger aircraft, the small fixed-wing unmanned aerial vehicles face significant stability challenges in a turbulent environment. 1. I find it is easier to make rate adjustments this way. As the name implies, they deflect by different amounts: When the stick or yoke is moved to the right, for example, the aileron on the right (descending) wing is deflected up much more than the left (ascending) wing’s. Aierons, elevator (or stabilator), and rudder. In order for it to function properly the aileron servos MUST be plugged correctly into the AIL and AUX2 channels which I can never remember. That is, the ailerons are responsible for one wing descending and one wing rising. In this paper, we review the concept of Lie brackets and how it can be exploited in generating motion in unactuated directions through nonlinear interactions between two or more control inputs. Once the designer has defined these parameters, it’s time to pay attention to the design details of the ailerons and the control forces needed to fly the airplane. Aileron differential can help with this, but proper use of the rudder is more effective. This is caused by the higher induced drag on the outside wing, which is also producing more lift. Roll refers to the movement of the aircraft around its longitudinal axis. 3 on the two degree-of-freedom system. . (The aileron can deflect up more than it can deflect down, reducing amount of drag on the upper wing and the rudder pressure required for compensation for adverse yaw). With ailerons, things are a bit different because they are part of a lifting surface. at the servo arm, at the control surface horn, and by offsetting the surface hinge line to the top or bottom of the wing. Then how to recover from said spin. If the engines are mounted under the centre of gravity, as in underwing passenger jets, then increasing the thrust will raise the nose while decreasing the thrust will lower it. Very often, repairs to a control surface require static rebalancing of the control surface. increasing or decreasing the RPM. During inspection of the Flight control system of an airplane equipped with differential-type aileron control, side to side movement of the control stick will cause each aileron to have a greater up travel (from the streamlined position). Control roll about the longitudinal axis Connected by cables, bellcranks, pulleys,. Using the Aileron Differential function built-in the transmitter. Autopilot is an automatic flight control system that keeps an aircraft in level flight or on a set course. and the up-going aileron moves 30 mm and the down-going aileron moves 21 mm This means that • the down-going aileron moves 30% less than the up-going aileron ((30-21)/30 = 0. The target morphing angles were derived as corresponding to a rigid rotation of a plain control surface comprised between -7° and +7°. 19. Voice alerts. Full span ailerons, 1 uses both the inner and outer control surfaces for roll control 0 just used the outer control surfaces. One aileron on one wing travels further up than the aileron on the opposite wing to adjust for wash-in and wash-out 45. The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following? Torque and directional control. The thing with differential is that the slower you fly and the closer to the stall the more you need. Includes aluminum dual air transmitter stand up case. Three axes, three sets of controls (mostly) With a few exceptions, light aircraft flight control systems are very much alike, using hinged flaps along the trailing edge of each wing (you already know them as ailerons) to control the airplane around its roll axis. Ailerons are a primary flight control surface which control movement about the longitudinal axis of an aircraft. At low AOA (where control stick was forward), left right motion caused only aileron deflection. It is usually used as a means to back up the primary control of the flight control surfaces. An aileron is a moving section at the back end of a plane that deflects upwards or downwards. In models there's three places. Differential. Hi there peoples!In this movie I first show you my new version of the SpeedWing :)After that, I do a little chit-chat about the how & why of differential ail. Reply Share. Check out the pronunciation, synonyms and grammar. Adverse yaw. Differential control on an aileron system means that a. It was mentioned that conventional monoplanes are equipped with two ailerons, one being attached to the trailing edge. The direct adjust function lets you make changes to a given parameter in flight so you can get instant feedback. Ailerons usually work in opposition: as the right aileron is deflected upward, the left is deflected downward, and vice versa. The increased lift of the raised wing results in increased drag, which causes the airplane to yaw or swing toward the side or direction of the raised wing. 4. It has 2 rotating propellers which can provide differential thrust, and an airfoil with a solid flap built in to make takeoff as short/efficient as possible. Differential is usually more up, less down. Collective pitch. In this case, since the raised aileron has as much or more surface area exposed to the airflow (thus increased drag) than. Most aircraft have some means of preventing, or. #1: Flight Control System - Lateral Controls. Can confirm that some 151s have them and some do not. That now means an airplane that will want to roll right as soon as you release the control wheel. Differential control on an aileron system means that the up travel is more than the down travel. with the nose into the wind. To help reduce the likelihood of wing tip stall and adverse yaw, engineers developed differential ailerons. This means that ailerons can double as landing flaps without the flap travel having any influence on the aileron gyro function. H. However, with proper aileron placement and wing twist, an aileron can produce proverse or neutral yaw, eliminating the need for aileron-rudder mixing, differential aileron deflection, or Frise ailerons. Aileron differential function should take into account the 4 wing servos when activated 06-24-2020,. The down travel is more than the up travel b. On ailerons yes differential will help preventing adverse yaw. This produces an increase in drag on the descending wing, which reduces adverse yaw. when the aileron surface moves down, it produces more drag than when it moves up. They are located by the tip of the airplane’s wing, as part of the trailing edge. Differential control on an aileron system means that the up travel is more than the down travel. You might also hear this setup being called differential ailerons. Study with Quizlet and memorize flashcards containing terms like Primary Control Surfaces, Secondary Control Surfaces, Ailerons and more. On faster planes with their more efficient control systems, differential as extreme as the TM is seldom seen. The aircraft control system controls the whole flight movement process. The extra upward aileron movement produces more drag change than an increase in AOA on the downward aileron. Adverse yaw is caused by a lift and drag differential between your two wings. Guess I should have said a little more in my last post. Full span ailerons, 1 uses both the inner and outer control surfaces for roll control 0 just used the outer control surfaces. On my MZ-24 I used the dual rates/expo function to control rates in each phase and differential to control differential the same way I do on the MZ-32. Hi Ken, The main reason for the differential, is to help make the turns smooth, the greater travel on the up aileron helps yaw the airplane in the intended direction. Placing a piece of cloth around a stainless steel control cable and running it back and forth over the length of the cable is generally a satisfactory method of C- Inspecting from broken wires If the control stick of an aircraft with properly rigged flight controls is moved rearward and to the left, the right aileron will moveThe larger travel of one aileron relative to the other is called aileron differential (Figure 5. Aileron actuators are pivotal components for aircraft flight control system. The vertical axis but not the longitudinal axis. The idea is to have the servo arm command the ailerons movement. Control surface rigged such that the aileron moving up moves a greater distance than the aileron moving down. The design of the aileron surface itself has also been improved by the "Frise type" aileron. The ailerons are the flight controls that roll the airplane around its longitudinal axis. Install and connect the ailerons and control linkages. The reason why ailerons are sometimes set up this way is to counteract any adverse yaw when the airplane is in a banked turn. Movement of an airplane along its lateral axis (roll) is also movement. In this system the aileron and rudder systems are interconnected, so that when the ailerons are deflected the rudder automatically moves to counter the adverse yaw. Ailerons. This is a vital and crucial aspect of flight control. Nothing1235. The most basic flight control system design and operate with a collection of mechanical parts such as rods, cables, pulleys, and sometimes chains to transmit the forces of the flight deck controls to the control surfaces. An aileron (French for 'little wing') is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft. C. An aileron (French for "little wing" or "fin") is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft. The control surface is considered aerodynamically unbalanced, flexible in torsion and with elastic axis close.