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It seems that trapezoid wings are used by all fifth generation fighters (although the wing of J20 looks quite like delta wing), but why? What made a trapezoid wing so attractive? Why don't they use other forms, like the swept wing on SU27?

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Trapezoidal wings have advantages and disadvantages:

  • Better performance than delta wings at transonic speed
  • Good stealth performances
  • Flaps can be easily used.
  • drag reducing
  • better Lift/Drag ratio than delta wings

The problem is that they stall at much lower angles of attack than delta wings.

Edit:this problem is overcome using leading edge,LERX,and/or canards

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  • $\begingroup$ I’ve edited your question a bit. If I accidentally removed something important, feel free to edit or revert to the original. $\endgroup$
    – dalearn
    Mar 24, 2020 at 14:22
  • $\begingroup$ Thanks for your answer! But can you compare the trapezoid wing with the swept wing(like ones on SU27) ? $\endgroup$
    – zyx
    Mar 24, 2020 at 15:01
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    $\begingroup$ what is biscus drag? $\endgroup$
    – zyx
    Mar 25, 2020 at 0:07
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    $\begingroup$ drag caused by layers of the fluid sticking to the object.More surface area means more of the object is in contact with the fluid, which means more drag $\endgroup$
    – L'aviateur
    Mar 25, 2020 at 10:05
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    $\begingroup$ possible typo in above comments -- the word is "viscous" $\endgroup$ Mar 25, 2020 at 11:29

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