In the drag polar, D x L, or Cd x Cl, the minimum D/L is obtained at the point whose tangent passes through origin. Is there something in calculus that proves this
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In the Cl vs Cd graph, Why the drag coefficient decreases initially with the small increment in lift coefficient? - Aviation Stack Exchange
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aircraft design - Why doesn't the minimum drag point meet the point at the best Cl/CD polar? - Aviation Stack Exchange
How do I... Read Polar Diagrams?
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In the Cl vs Cd graph, Why the drag coefficient decreases initially with the small increment in lift coefficient? - Aviation Stack Exchange
How to Read a Cl v Alpha Polar Plot Chart | RC CAD2Vr
How do I... Read Polar Diagrams?
