Aircraft Class I Zero-Lift Drag Coefficient

This variable includes the compressibility effects.

The aircraft drag polar is expressed as:

..\Images\IMG00024_shg.gif

For parabolic drag polars:

..\Images\INFO0251_wmf.gif

where:

..\Images\INFO0252_wmf.gif

is the wing aspect ratio.

..\Images\INFO0253_wmf.gif

is the Oswald's efficiency factor.