Quote:
Originally Posted by Varn
...... yarn
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I could tape a bunch of yarn strands of various lengths, drive around and see if any of them get sucked into the gap (from boundary flow).
If all the flow goes over the wing and somehow just manages to dump downward after the wing, all the yarn strands will lay over (or short depending on length) the wing.
If the boundary layer is being sucked into the gap (at a downward angle of perhaps 45 degrees), and then pulling or drawing on the air above it (as theorized), then some of the yarn will end up lying in the gap between the cab and wing.
If someone were to video the truck at speed during a heavy snowfall, I bet some data could be acquired as well.