Page 8 - Combined_73_OCR

AXIS SYSTEM AND NOMENCLATURE - Figure 1 presents the axis system

utilized in this investigation. The axis system is a standard, air­

craft based, body oriented system of orthogonal coordinates. Positive

lift is vertically upward, positive axial force is rearward and positive

side force is to the left (Driver' view). The lift and side force data

presented in this work are presented as front axle and rear axle coeffi-

n ients rather than total vehicle lift or side force coefficients and
yawing and pitching moment coefficients. This mode of presentation is

thought to be more applicable to automotive work than the classical six

component data presentation at a reference point used in aircraft

studies.

The following nomenclature was utilized in this work:

Axial Force Coefficient = Axial Force
co
cr
Front Axle Lift Coefficient Front Axle Lift
co
cr
Rear Axle Lift Coefficient = R§ar Axle Lift
co
cr
Front Axle Side Force Coefficient - Front Axle Side Force
00
cr
Rear Axle Side Force Coefficient = Ax le Side^Force
qs

= Incremental Axial Force Coefficient

2\Cl (Rear Axle) = Incremental Rear Axle Lift Coefficient

^L (Front Axle) = Incremental Front Axle Lift Coefficient

**G = Rear Deck Horizontal Stabilizer Angle Relative to Ground

= Freestream Dynamic Pressure = V2
C T
= Freestream Mass Density

V = Car Speed

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