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I have wondered why some aircraft, use a small moveable control
surface seperate from the normal controls. I believe I have seen this in the form of a small wing under the horizontal stab being used as elevator trim. I once installed a trim tab on the back of the elevator on an Ultralight Challenger and induced severe flutter, something I did not want to repeat and obviously it is more than just deflecting the control. Ray On Thu, 24 Jun 2004 10:16:24 +0200, "Jan Carlsson" wrote: A small tab at the trailing edge is moving the control surface so the control surface is doing the job (trimming) by a small change in the angle, if the trim tab is sitting on a fixed part of the plane a bigger tab and or angle is needed. Jan "Jay" skrev i meddelandet . com... I've noticed that a lot of aircraft put trim tabs on the trailing edges of the normal movable control surfaces. Wouldn't this just deflect the control surface to neutralize the forces and not affect much change except drag? It seems like you'd want to put the trim tab on the fixed part of the wing/stab/vert, that way its pushing the airplane instead of the flight controls in your hands. I've noticed some articulated mechanisims on some aircraft (anti-servo) but this seems to be a complicated way to make up for the fact that the tab was put in the wrong place to begin with. What am I missing? |
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