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What determines the back-edge sweep angle of aircraft wings?
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Planes have swept wings for better high speed performance, but why the back-edge(idk what it is called)? Why is it that an F16 or Mig-21 have their wing's back-edges straight meanwhile F15 and airliners etc have it angled? Then there are aircraft like Hampden which have a non swept wing but the back-edge is angled. That also makes me question why delta wing aircrafts all have straight back ends and none have it angled (Only the lavi did, abit).
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