Aircraft Zero-lift Drag Coefficient at Landing with Gear Up

The aircraft drag polar is expressed as:

..\Images\IMG00028_shg.gif

For parabolic drag polars:

..\Images\INFO0268_wmf.gif

where:

..\Images\INFO0269_wmf.gif

is the wing aspect ratio.

..\Images\INFO0270_wmf.gif

is the Oswald's efficiency factor.