A drag count is a dimensionless unit used by aerospace engineers.
[1][2] As the drag forces present on automotive vehicles are smaller than for aircraft, 1 drag count is commonly referred to as 0.0001 of
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 of 200 to 400 is typical for an airplane at cruise.
[4] A reduction of one drag count on a subsonic civil transport airplane means about 200 lb (91 kg) more in payload.