PSI vs MPH Calculation: Force for Wind Resistance

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Discussion Overview

The discussion revolves around calculating the force required to counteract wind resistance (measured in PSI) for a vehicle traveling at 80 miles per hour. Participants explore the implications of using compressed air to combat this wind resistance, considering various applications and methods.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks to understand the calculation for the force needed to counteract wind resistance at high speeds.
  • Another participant clarifies whether the inquiry pertains to calculating wind resistance specifically for automobiles.
  • A participant specifies interest in the amount of compressed air pressure needed to oppose wind over a distance of 3-4 meters.
  • Questions arise regarding the application of compressed air, including whether it will be used in an air motor or a sail, indicating that the method of application may influence the required pressure.
  • A suggestion is made to use Bernoulli's equation to address the velocity pressure involved in the calculations.

Areas of Agreement / Disagreement

Participants express varying degrees of understanding regarding the application of compressed air and the specifics of the calculations, indicating that multiple competing views remain without a consensus on the approach or solution.

Contextual Notes

The discussion lacks clarity on the assumptions regarding the setup and application of the compressed air, as well as the specific definitions of terms like "wind resistance" and "compression." There are unresolved details about the intended use of the compressed air and how it relates to the distance mentioned.

norm88j
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Hello PF,

I would like to know what is the calculation for determing the amount of force it would take to combat PSI of the wind in a vehicle moving at 80 mile per hour.
 
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Are you talking about how to calculate wind resistance for an automobile? Is that the question?
 
yes, more importantly compressed air going in the opposite direction. How much compression or compressed psi would be necessary tocombat the wind 3-4 meters?
 
Where do you envision applying compressed aire to oppose the wind? How much will be required seems like it might depend upon how you will use it. Will you use it in an air motor working on the wheels to power the wheels? Will you apply it to a sail? Just what are you thinking? What do you mean when you add "3-4 meters"? This really does not make much sense.
 
the opposing air would come from a motorized compressed apparatus or hose.
 
Use the simple form of bernoulli's equation for velovity pressure.
 

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