Mr. Gasket 8703 Hot Rod Calculator User Manual
Page 35
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eT Prediction and Wind Conditions
now let’s say you ran your 3,840-pound 1970 Ford Mustang
notchback at Top Gun Raceway in Fallon, nev., where there are
often raging winds. you can use your actual ET and determine
what your ET would have been without the windy conditions.
you will need several new pieces of information. At a minimum,
you need to know what the Wind Speed and direction were
when the ET was recorded. Additionally, you need to know the
race car’s Frontal Area and Drag Coefficient.
To determine your race car’s Frontal Area, measure the vehicle
from “head-on”, measuring from the bottom of the front bumper
to the top of the roof and the widest point-to-point of the race
car (e.g., door handle-to-door handle). It is also helpful if you
know your race car’s shape factor, though most are between
80% and 85% of the race car’s Frontal Area (excluding dragster-
style race cars).
Here’s an example of calculating a race car’s Frontal Area using
a height of 46 inches, a width of 70 inches and a shape factor of
85%.
KeysTroKe
disPlay
1. Clear all stored values and calculate the Frontal Area:
(Clear All)
all Cleared
46
in
70
in
2737.
s in
(Feet)
19.006944
s f
2. Store the estimated Frontal Area value:
(Frontal Area)
area 19.006944
s f
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do noT Clear CalCUlaTor —
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