Roofbox changes towing sensation
Morning all.
An observation I felt was worth sharing. I've been towing caravans for some while now but never with a roofbox. I've just travelled the 300+ miles to Cornwall with our XC70 & 1500kg van with roofboox on the car. The roof box is aerodynamically shaped Thule made Volvo brand box and the bars Volvo aero wing. The difference I found was that the caravan was felt less ie no occasional tugs as headwinds changed with wind direction or passing vehicles. The roofbox clearly acted as a aerofoil. The vehicle fuel consumption stayed the same, 28mpg and SWMBO got to bring even more things than necessary with her. |
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years ago i did see a few "wings" https://www.rvpartsexpress.com.au/me...f/dflector.jpg always thought "meh" to them as height/angle/distance to-from van + height of van = a shed load of variables to get them to work more as a deflector than air brake |
Id forgotten the roof spoiler wings - always amused me to see them still on a car weeks or months after the dummer hols. Just like roofboxes stay on untill November.
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Ps if you're hijacking this thread have a word with your spell checker will yer, its struggling with really simple words.:tounge_smile: |
I suppose it's obvious when you think about it, I noticed a difference between towing the van with the xc70 and the discovery, but that's more to do with volvo power compared to landrover torque than aerodynamics.
Certainly 60 mpg into a headwind and even the volvo tells you its working by the amount of fuel it uses, still less than the landrover at 40 mind. In effect you are towing a wall, any ramp must improve matters as airflow is smoothed but modern cars are designed in wind tunnels to optomise airflow, chuck a wall behind them and all the calculations are void. Paul. |
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