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Difference between revisions of "Trim Tab"

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==Discussion==
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==Description==
 
Trim tabs are small, secondary [[Flight Controls|flight control]] surfaces that are attached to the trailing edge of a larger, primary control surface such as an [[Elevator|elevator]] or [[Rudder|rudder]]. The trim tab is used to "trim", or counteract the aerodynamic force on,  the control surface and thus stabilise the aircraft in the [[Axis of Rotation|axis of rotation]] associated with the primary control. Trim tabs can be either flight adjustable or fixed.
 
Trim tabs are small, secondary [[Flight Controls|flight control]] surfaces that are attached to the trailing edge of a larger, primary control surface such as an [[Elevator|elevator]] or [[Rudder|rudder]]. The trim tab is used to "trim", or counteract the aerodynamic force on,  the control surface and thus stabilise the aircraft in the [[Axis of Rotation|axis of rotation]] associated with the primary control. Trim tabs can be either flight adjustable or fixed.
  
By adjusting the angle of the trim tab relative to the larger control surface, the neutral position of the control surface is changed. This occurs because the distance from the control surface hinge or [[Arm|arm]] at which the trim tab is mounted provides sufficient [[Moment|moment]] to move the larger surface.  
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By adjusting the angle of the trim tab relative to the larger control surface, the neutral position of the control surface is changed. This occurs because the distance from the control surface hinge at which the trim tab is mounted provides sufficient [[Moment|moment]] or force to move the larger surface.  
  
Fixed tabs are most often encountered on a light, single engine aircraft. A fixed tab is ground adjusted (bent) to the desired position to overcome any unwanted roll or yaw tendencies of the aircraft. On aircraft equipped with adjustable trim tabs, the position of the tab can be changed in flight, using cockpit controls, to counter any change in control loading caused by airspeed, [[Centre of Gravity|centre of gravity]], aircraft configuration or engine failure. Trim tab control can be manually or electrically controlled, depending upon the aircraft installation.
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Fixed trim tabs are most often encountered on the rudder or [[Ailerons|aileron]] of a light, single engine aircraft. A fixed tab is ground adjusted (bent) to the desired position to overcome any unwanted [[Roll|roll]] or [[Yaw|yaw]] tendencies of the aircraft. Adjustable trim is virtually always installed to adjust control loading associated with the [[Pitch|pitch]] axis and may also be used to trim for yaw or roll. The position of an adjustable trim tab can be changed in flight, using cockpit controls, to counter any variation in control loading resulting from changes in airspeed, [[Centre of Gravity|centre of gravity]], aircraft configuration or due to an engine failure. Trim tabs can be manually or electrically controlled (or both), depending upon the aircraft installation.
  
 
==Related Articles==
 
==Related Articles==
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*[[Rudder]]
 
*[[Rudder]]
  
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==Further Reading==
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*[http://www.skybrary.aero/bookshelf/books/2627.pdf "Do you really understand how your trim works?"] - Captain Alex Fisher
  
[[Category:Glossary]]
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[[Category:General]]

Latest revision as of 08:48, 2 August 2017

Article Information
Category: General General
Content source: SKYbrary About SKYbrary
Content control: SKYbrary About SKYbrary

Description

Trim tabs are small, secondary flight control surfaces that are attached to the trailing edge of a larger, primary control surface such as an elevator or rudder. The trim tab is used to "trim", or counteract the aerodynamic force on, the control surface and thus stabilise the aircraft in the axis of rotation associated with the primary control. Trim tabs can be either flight adjustable or fixed.

By adjusting the angle of the trim tab relative to the larger control surface, the neutral position of the control surface is changed. This occurs because the distance from the control surface hinge at which the trim tab is mounted provides sufficient moment or force to move the larger surface.

Fixed trim tabs are most often encountered on the rudder or aileron of a light, single engine aircraft. A fixed tab is ground adjusted (bent) to the desired position to overcome any unwanted roll or yaw tendencies of the aircraft. Adjustable trim is virtually always installed to adjust control loading associated with the pitch axis and may also be used to trim for yaw or roll. The position of an adjustable trim tab can be changed in flight, using cockpit controls, to counter any variation in control loading resulting from changes in airspeed, centre of gravity, aircraft configuration or due to an engine failure. Trim tabs can be manually or electrically controlled (or both), depending upon the aircraft installation.

Related Articles

Further Reading