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Air resistance




Variables that are important for calculating the air resistance.

VehicleCross-sectional areacW valueAir resistance
at 100 km/h
Motorcycle
cladded		0,79 m²0,57224 N
Motorcycle
undisguised		0,81 m²0,63254 N
Small car1,80 m²0,32287 N
Medium-sized vehicle2,00 m²0,28279 N

The greatest influence on air resistance is the speed of the vehicle or the air speed. The value for the shape (cW) and the largest cross-section follow at a considerable distance. Air resistance depends even less on air density. If the cross-sectional area cannot be determined precisely, it can be determined using a rule of thumb based on height and width.

By the way, air resistance is not a constant value. It usually increases with driving speed. That is why it should always be specified too.

A 0,8 · b · h


Checking the calculation!     Need help?
Please only enter numers in two fields and click on the free field!
b Width mm cm dm m
h Height mm cm dm m
A Surface mm² cm² dm² m²
Places behind the decimal point: 2 3 4 5

      A · · v² · cW
  FL =
          2

FL · 2
A =        
· v² · cW

FL · 2
=        
cW · v² · A

FL · 2
cW =        
· v² · A


Checking the calculation!     Need help?
Enter numbers in four fields and clicknon the free field!
FL Air resistance N
A Cross-sectional area m²
v Air velocity m/s km/h
cW Drag coefficient
Density (air) kg/m³

Here is another example:

Let's assume you have a car with a cross-sectional area of around 1.8 m2 and you are driving at 130 km/h with a cW value of 0.33. If your vehicle had a cW value of 0.30, then 136 km/h would be possible with the same air resistance.






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