- Source: Drag count
A drag count is a dimensionless unit used by aerospace engineers. 1 drag count is equal to a
C
d
{\displaystyle C_{d}}
of 0.0001.
As the drag forces present on automotive vehicles are smaller than for aircraft, 1 drag count is commonly referred to as 0.0001 of
C
d
{\displaystyle C_{d}}
.
Definition
A drag count
Δ
C
d
{\displaystyle \Delta C_{\mathrm {d} }\,}
is defined as:
Δ
C
d
=
10
4
2
F
d
ρ
v
2
A
,
{\displaystyle \Delta C_{\mathrm {d} }=10^{4}{\dfrac {2F_{\mathrm {d} }}{\rho v^{2}A}}\,,}
where:
F
d
{\displaystyle F_{\mathrm {d} }\,}
is the drag force, which is by definition the force component in the direction of the flow velocity,
ρ
{\displaystyle \rho \,}
is the mass density of the fluid,
v
{\displaystyle v\,}
is the speed of the object relative to the fluid, and
A
{\displaystyle A\,}
is the reference area.
The drag coefficient is used to compare the solutions of different geometries by means of a dimensionless number. A drag count is more user-friendly than the drag coefficient, as the latter 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 200 lb (91 kg) more in payload.
Notes
References
See also
Drag coefficient
Zero-lift drag coefficient
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