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from what i understand, additive drag is not really drag. it is a way to account for the variation of inlet condition due to conservation of mass. but i still don't get why it create drag(negative thrust) when bookkeeping the thrust value of all parts of jet engine/ducted fan

can anyone explain this for me

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  • $\begingroup$ Related, possibly duplicate: aviation.stackexchange.com/q/29376/17780 $\endgroup$
    – bogl
    Commented Oct 11, 2019 at 7:04
  • $\begingroup$ The question is perfectly clear. Why do people flag it as unclear? $\endgroup$
    – bogl
    Commented Oct 11, 2019 at 7:04

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