More on wind deflectors

Submitted: Monday, Mar 10, 2008 at 11:05
ThreadID: 55390 Views:3072 Replies:8 FollowUps:7
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There was a thread last week (55274) where the merits or otherwise of wind deflectors on roof racks were discussed.
Comments were mixed and apparently the deflectors seem to both work, and not work, depending on the comment makers.
Irrespective of the possible savings in fuel economy, the down force of the deflectors must be adding to the effective weight of the vehicle and subsequent suspension, friction and tyre wear.
I would suggest that one and a half square metres of deflector at 45 degrees at say 80 km/h would have to add heaps of kilograms of downforce. The dead weight of the roof load could be doubled or worse with the added live load of the deflector.
Any comments or theories in this subject?
Cheers
Ian
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