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.
answered Dec 19, 2020 at 13:23
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$\begingroup$ How much is an airliner's Cd, using the frontal area as reference point? $\endgroup$– user52248Commented Dec 22, 2020 at 7:24
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$\begingroup$ @Aeolus it depends on the speed, the AoA, the sideslip, the rates, the configuration $\endgroup$– FedericoCommented Dec 22, 2020 at 8:01