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Thread: Roof bars/racks. Which is more aerodynamic?

  1. #1
    Join Date
    Feb 2010
    Location
    sydney
    Posts
    802

    Roof bars/racks. Which is more aerodynamic?

    Just a thought experiment...

    Which would be more aerodynamic on a 110 defender? (Yeah I know)
    3 to 4 typical crossbars sitting approx 100mm off the roof, or a thin full length alloy roof rack that sits ALMOST on the roof and follows the contour of the roof very closely, with minimal space/gaps between the members?

    What say you?

  2. #2
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    25,074
    Almost certainly the second - but the actual drag will depend on what you are carrying, and you should remove the rack when not carrying anything - and you can probably carry the bars internally, which you definitely can't the rack.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  3. #3
    Join Date
    Feb 2010
    Location
    sydney
    Posts
    802
    I use my 3 x roof bars every week with my work so although I agree taking them off is best itís not an option unfortunately.

    I also have a full length alloy rack that Iím considering putting on very short legs and cutting and welding it to follow the roof contour hence the thought experiment.

    glad to hear you think the rack option would be the most aerodynamic as it is the most versatile.

    Anyone think differently?

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