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How much is an airliner's Cd, using the frontal area as reference point. I want to compare values with cars and others objects, tear drops, cube etc.

Is Cd measured at zero lift AoA or when the plane is flying in a straight line?

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Is Cd measured at zero lift AoA or when the plane is flying in a straight line?

Both.

$C_D$ is a function, not a number.

The "numbers" are the partial derivatives: $C_{D_\alpha}$ measures how $C_D$ changes w.r.t. the angle of attack $\alpha$, for example.

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  • $\begingroup$ How much is an airliner's Cd, using the frontal area as reference point? $\endgroup$
    – user52248
    Dec 22 '20 at 7:24
  • $\begingroup$ @Aeolus it depends on the speed, the AoA, the sideslip, the rates, the configuration $\endgroup$
    – Federico
    Dec 22 '20 at 8:01

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