Drag count

A drag count is a dimensionless unit used by aerospace engineers where 1 drag count is equal to a formula_1 of 0.0001.
Definition.
A drag count formula_2 is defined as:
where:
The drag coefficient is used to compare the solutions of different geometries by means of a dimensionless number. A drag count is used as a more user-friendly measurement as the coefficient of drag is usually much less than 1. A drag count of 200 to 400 is typical for an airplane at cruise. A reduction of one drag count on a subsonic civil transport airplane means about more in payload.