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    Drag From Cold Weather

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    Mopar1973Man

    I've seen this a few times where people claim that cold weather will produce more drag on a vehicle just the cold dense air. So just for the fun of it I went and did the calculation on just the air drag part of it. Not factoring in other loses like fluid thickening...

    Here is the formulas I used

    Drag

    http://www.thefintels.com/aer/dragcalc.htm

    Air Density

    http://www.denysschen.com/catalogue/density.aspx

    Dodge Ram Specs including Drag Coefficient

    http://www.pickuptrucks.com/html/ram_specs.html

    So using local information and building a test bed on this.

    Vehicle - 2nd Generation Dodge Ram 2500 truck

    Test #1 Winter (Column C)

    Stats

    [*]+10*F Temperature

    [*]90% Humidity

    [*]2,800 ft Elevation

    [*]45 MPH (Road conditions locally)

    Test #2 Summer (Column B)

    Stats

    [*]+100*F Temperature

    [*]10% Humidity

    [*]2,800 ft Elevation

    [*]65 MPH

    Test #3 Comparing both using both summer and winter conditions. (Columns E & F)

    Which this shows roughly 4.659 MPH difference between winter and summer condition will be nearly equal in drag.

    post-2-138698211875_thumb.png

    Just for fun compare 55 and 65 MPH...

    post-2-138698211902_thumb.png

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