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Thread: Wheel on Bonnet = Aerodynamic improvement

  1. 23rd July 2012, 10:26 PM #1
    rrturboD's Avatar
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    Wheel on Bonnet = Aerodynamic improvement

    Here is proof, for those who want to read it all I have attached the full South African University research paper, ....for the rest of us here is the main findings:

    "Placing a tyre (spare wheel) on the bonnet of a Land Rover Defender decreases the vehicle’s aerodynamic drag by roughly 8%. The best position for a short roof rack is at the most rear position on a vehicle. The addition of an unloaded roof rack can increase fuel consumption with roughly 21% for the Land Rover Defender and 26% for the Toyota Hilux Bakkie (Ed: ute)."
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    Michael T
    2011 L322 Range Rover 4.4 TDV8 Vogue
    Aussie '88 RR Tdi300 (+lpg), Auto (RIP ... now body removed after A pillar, chassis extension to 130 & fire tender tray.)
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  2. 23rd July 2012, 10:38 PM #2
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    Some countries study the Higgs boson......

    we study the IMPORTANT STUFF!
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  3. 23rd July 2012, 10:39 PM #3
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    Quote Originally Posted by rrturboD View Post
    "Placing a tyre (spare wheel) on the bonnet of a Land Rover Defender decreases the vehicle’s aerodynamic drag by roughly 8%. The best position for a short roof rack is at the most rear position on a vehicle. The addition of an unloaded roof rack can increase fuel consumption with roughly 21% for the Land Rover Defender and 26% for the Toyota Hilux Bakkie (Ed: ute)."
    Wow! I knew roof racks didn't help your fuel economy, but think of how many vehicles you see getting around with empty roof racks on
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  4. 23rd July 2012, 11:51 PM #4
    Davo
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    Whew! What a read. They really should make a snappy 2-minute Youtube video instead. That's great stuff, and well worth the work they put into it.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  5. 24th July 2012, 01:27 AM #5
    superquag
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    Wonder how much drag you'd get with a pair of RHINO racks (two single bars).


    Dunno if I want a spare wheel on the bonnet of my Classic....
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  6. 24th July 2012, 04:42 AM #6
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    duno but it would be better than those big boxy roof tents.
    Jason

    2010 130 TDCi
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  7. 24th July 2012, 04:47 AM #7
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    Quote Originally Posted by superquag View Post
    Dunno if I want a spare wheel on the bonnet of my Classic....
    Try opening the bonnet with a spare wheel on it!
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  8. 24th July 2012, 05:41 AM #8
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    Maybe that's why mine is so thirsty
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  9. 24th July 2012, 06:06 AM #9
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    Quote Originally Posted by jerryd View Post
    Maybe that's why mine is so thirsty
    I didn't think it mentioned chickens in the report
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  10. 24th July 2012, 07:08 AM #10
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    That big cock on the bonnet would have to help
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