Drag Force

  • Thread starter philo2005
  • Start date
  • #1
4
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Hi

I am currently trying to work out the drag coefficient of a car, I know the formulae to work out CD, this being CD=FD/0.5xρv^2A. I can not figure out how to find FD as the formulae for this requires CD. Is there another way to find FD? The information I have is as follows:

Car Mass: 1350 kg
Rolling Resistance: 400 N
Cross Sectional Area: 2.2 m^2
Density of Air: 1.23 kg m^-3
Hill Gradient: 3.18 degrees

I would greatly apprecitate any help offered as I am now completely stumped.

Thanks
 

Answers and Replies

  • #2
boneh3ad
Science Advisor
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Gold Member
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The way to work out Fd is through CFD. You could simplify it enough to do it by hand as well, but there really is no quick and easy way to do it.
 
  • #3
cjl
Science Advisor
1,875
447
The typical way to find Fd would be a wind tunnel. There isn't really any good way to do it analytically for a shape like a car.
 
  • #4
563
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From the looks of your info, the car in question will attain a specific steady state speed on that hill; you need to know that speed ("84.7 km/h") in order to figure out the Cd.
 

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