Vehicles and Air Friction

Replies

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  Anand Tamariya

  At low speeds, aerodynamics is not important. That's why.
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  ABCD ABCD

  Anand Tamariya

  At low speeds, aerodynamics is not important. That's why.

  I'm uncertain about this, because trains move normally in high speeds compared to cars.
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  babumoshaaye

  High speeds in trains are only when it is more than 200kmph. In India, most of the trains hardly travel at around 90kmph. Trains also most of them run on electricity and don't need to be streamlined. Since they always travel around the same average speed.
  
  Even if we could have streamlined trains it would mean trashing all the existing trains which would demand way lot of money. And I don't think that the rail guage are capable of handling high speeds.
  
  Cars on the other hand have variable speeds and have a small body and hence they need to be streamlined so that the driver may have the liberty to travel at any limited speed without draft. But still not sure about the car's streamlined body!
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  Anand Tamariya

  mreccentric

  I'm uncertain about this, because trains move normally in high speeds compared to cars.

  Have a look at bullet train (Japan) or TGV (France).
• 

  zaveri

  The reasons which you guys gave are valid.
  
  But what i feel is that if buses are given the aerodynamic shape, then the design may get too complicated.
  
  Now there are cars like maruti omni and maruti eeco. these aren't aerodynamic, are they ?
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  Anand Tamariya

  Now there are cars like maruti omni and maruti eeco. these aren't aerodynamic, are they ?

  What's the top (design) speed of maruti omni?
• 

  The Observer

  Anand Tamariya

  What's the top (design) speed of maruti omni?

  i've never seen an omni go above 20kmph. except when in movies when the criminals use them 😛
• 

  CE Designer

  mreccentric

  The front side of a vehicle is shaped so that it reduces air friction. Thats why vehicles have inclined bonnet. All most all cars are so. But, why aren't any Buses or Trains shaped in that fashion that it reduces air friction? Buses and trains have are flat at the front.

  The more important reason for the inclined shape at the front is to create a down-force on the car so that it stays on the ground. The inclined shape allows more airflow to the top of the car. If it were not so then the air flow below the car could create a lifting force.
  In contrast to sports cars, the wings of air planes are designed purposely to create that lift which is opposite to that of a race car.
  Other small features like cut outs in the bumper and fins allow better airflow and reduce friction. If you notice, most sports cars also sink on the sides like this audi - Sports Cars Photo (27297397) - Fanpop
  This helps with reducing friction as well.