| 21. | Later Autodesk developed the Autodesk Control Surface manufactured by Tangent Devices.
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| 22. | Its tail control surfaces are horn balanced and increased in area.
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| 23. | Fixed tail surfaces were plywood skinned and control surfaces fabric covered.
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| 24. | Frozen contaminants can jam control surfaces, preventing them from moving properly.
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| 25. | There was no evidence of any control surface failure prior to the crash.
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| 26. | The computers adjust the X-29's control surfaces up to 40 times a second.
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| 27. | This can affect the operation of a conventional elevator control surface.
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| 28. | Control surfaces with motorized faders can read and write console automation.
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| 29. | The controllability of an airplane by the control surfaces only depends on airspeed.
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| 30. | Like the ailerons, the rear control surfaces were fabric covered.
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