Quote:
Originally Posted by ALS
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The closest thing I have done is a roof wing on my pick-up truck which isn't really a roof wing but more like one of these extensions (see link in my signature below).
From the article (which is pretty good other than this):
Quote:
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“Until you get up over 175 mph, you’re not even going fast enough to create measurable amounts of downforce.
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Say what?
The roof wing on my pick-up truck isn't flush like these guys, a leading edge air slot allows some air bleed and I suspect lower pressure (possible faster air flow on underside) which in turn draws the mass of higher pressure air above down, perhaps not straight off as in the 1965 notch-back Mustang.
If I think about it too much, maybe there isn't much flow on the Stang rear deck unlike the roof of my truck which is all flow.
In any case my seat of the pants estimates put the roof wing contribution at 200 lbs down-force at speeds above 55 mph (
gas tank location near there, full tank - empty tank equivalent or more). I can feel many of my aerodynamic experiment take place in the 30-35 mph range, so I do dispute the article quote far above quite fiercely
Quote:
Originally Posted by oldtamiyaphile
It's not so much about creating downforce as reducing lift.
These kinds of boot extensions have been discussed before and can reduce fuel use.
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Yes have talked about these conditions before, but don't recall a dedicated thread on the topic.
If you can provide a link to such a discussion it would be greatly appreciated.