AirshipDrag:
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Compute the approximate drag on an airship.
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Form:
D = AirshipDrag( h, u, A, Cd );
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Inputs
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h (1) Altitude [m]
u (1) Velocity [m/s]
A (1) Reference Aera [m^2]
Cd (1) Zero-incidence drag coeffcient
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Outputs
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D (1) Total drag force [N]
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Children:
Common: Atmosphere/StdAtm
