I've seen air deflectors on the front corners of trucks for years and have always wondered whether they really work.
The above picture shows deflectors not only on the sides, but also above the windshield. Does this help by deflecting towards the rear air that would normally be pushed to the side, thereby gaining forward momentum (sort of like a sail), or is this outweighed by the penalty of extra drag? I've also seen deflectors/scoops on the rear of vehicles, scooping air into the lowpressure zone immediately behind the truck. Would this make sense, or would it act more like a parachute?
I'll add that trucks aren't the only places I've seen side deflectors:
German-built Ty2-50 steam loco.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
Piwoslaw's Peugeot 307sw modding thread
