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Old 22nd Jul 2008, 13:24
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FE Hoppy
 
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Technically speaking the panels on top of the wing on most if not all modern jets are "spoilers". They are used for various functions such as:

"Speed Brake" - symmetrical variable deployment of some or all pairs of spoilers to increase drag and reduce lift. Often the most inboard pairs are not used for this function.

"Ground Spoiler" - sometimes called Lift Dump - symmetrical deployment of all pairs to max position in order to disrupt lift and put the weight on the wheels to improve braking on landing or in the case of a rejected take off.


"Roll spoiler" - Asymmetric variable deployment to assist or completely control roll.

"Direct Lift Control" - Symmetrical variable deployment coupled to elevator or stabilizer input in order to "Directly control the lift" as apposed to indirect lift control by virtue of varying pitch and therefore AOA.

"Maneuver Direct Lift Control" - symmetrical automatic variable deployment of some or all pairs in order to reduce load factor during high speed maneuvers.

Did I miss any?
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