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boufogre avatar image
boufogre asked boufogre edited

I don't understand drag


As if it was not yet obvious from my previous questions on the topic, I must be stupid because I cannot understand how the drag is calculated.

An example in pictures:


How can the parasitic drag be negative?

If I go back to a normal speed for this altitude:


Even at normal cruise speed, some "negative" drag is calculated and reducing the parasitic drag by half.

Could you explain this please?

I have a really hard time tuning the drag of the aircraft, and I believe the missing drag in cruise (reflected in a too low N1 in cruise) is due to this negative drag.

Thank you.

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