Page 4 - Combined_23_OCR

□ 1969 RACE CHARGER
o CHARGER DAYTONA
(HORIZONTAL STABILIZER ANGLE = 0 deg)

COEFFICIENT O

FORCE O

A X IA L
BACKLIGHT. ANGLE

0.30
0.4
FRONT AXLE
0.3
5 .A C K COEFFICIENT 0.2
/ 1-
/ <|
/ I
7\X1AL I o -
002 FORCE -L L IF T
Hr£'_.F .y -0.1 o

0.1 REAR AXLE ' I j
COEFFICIENT O i

L IF T o——p
J— ----- -—....
10 20 30 40 50 -3 -2 □
BACKLIGHT ANGLE, deg BODY RAKE ANGLE,deg
FiG. 6 Daytona has a 2.2.-deg backlight slope and rounded side to FIG. 7 Vehicle attitude strongly affects both lift and axial forces. The
backsight juncture maintaining flow attachment—lowering oxial force. Doytona race car achieves minimum drag when angled ct —0.5 deg.
a full fastback treatment, On actual sensitive to vehicle attitude (Fig. 7). pension, exhaust system , and struc-
vehicles, however, 3-dimensional ef­ The Daytona has minimum drag at tural members. Cooling airflow was
fects allow attached flow’ over back- —0.5 deg while for the 1969 race modeled as were grille, wheel well,
lights with relatively steep angles, car the angle is —1.5 deg. . and engine compartment openin
These effects are used in the Daytona
which has a backlight slope of 22 deg Test tuo
an p . rounded side to backlight junc- Most of the above data were col­ FOR FURTHER INFORMATION
> ture. Flow attachment is achieved, lected in the 7 x 10-ft wind tunnel at The following publication was used in the
resulting in a 0.021 decrease in axial Wichita State University usin •'0 co development of'this article:
• . force coefficient at the zero yaw con­ scale model. The 16 x 23-ft tunnel 700036 Aerodynamic Development of the
Charger Daytona for Stock Car Competi­
dition (Fig. 6). The standard Char- at Lockheed-Georgia was used for
tion, by R. P. Mar cell and G. F. Romberg,
■ ger has a 45-deg Backlight slope and tunnel correlation studies and'a very
Chrysler Corp.
’ the inset position of the ' backlight limited study of a full-scale model.
To order the publication listed above, circle
.; precludes flow . onto the backlight The %-scale model had accurately, ths appropriate 6-digit number on the Reader
. from the side of the car. . .; •; ' reproduced underbody detail in­ Service Card following the yellow pages.
Lift and axial forces are also /very cluding a simulated gas tank, sus-
Volume 78, Number 5