User guide

HOT ROD CALC™ — 31
Enter the estimated Frontal Area value:

(Frontal Area) AREA S 19.006944 S F
Next, see Appendix A — Body Style and Drag Coefficients,
for typical body styles and associated drag coefficient values.
The default Drag Coefficient value in the calculator is .35. Using
Appendix A for a “Notchback or Sedan” style body, we will select a
value of .45.
Enter the Drag Coefficient of our 1970 Ford Mustang Notchback:
KEYSTROKES DISPLAY

(Drag Coefficient) DRAG S 0.45
Your disappointing ET was 13.85 at 102.304 MPH, and the vehicle
weight is 3,840 pounds.
Note: A pure head-wind direction is entered as 0°; a pure cross-
wind direction is entered as 90°; a pure tail-wind direction is
entered as 180°.
Head
180°
0°
Tail
45°
90°
At this point, the race car’s estimated Drag Coefficient and Frontal
Area entered and stored in memory.