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Why does the rudder trim tab on the DA42 have a T-shape?

enter image description here

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  • $\begingroup$ I'm not sure it is clear what you are asking. What do you mean by "characteristic"? $\endgroup$ May 21 '19 at 12:30
  • $\begingroup$ I meant, aerodynamically what is the purpose of such design ? $\endgroup$
    – Rohan
    May 21 '19 at 12:44
  • $\begingroup$ Looks like you got your answer then. :) $\endgroup$ May 21 '19 at 12:59
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The feature was added to reduce undesirable flutter discovered during flight test. It appears on the rudder trim tab of the DA-62 as well.

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  • $\begingroup$ "Buzz" (a simple vibration that doesn't excite sympathetic motion in the surface and structure) or just "vibration" might be a better word than flutter. When you get flutter you generally don't survive it. Another purpose of those kinds of TE add-ons (and the bulged surface itself) is to help with a dead zone problem that prevented the surface from precisely centering. $\endgroup$
    – John K
    May 21 '19 at 20:07

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