The vortex generators create counterrotating vortices that promote reattachment of the laminar flow to a surface that isn't there. You could peel them off and put them further forward.
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..mirrors are smaller than I would like, but they are OK and with power adjustment good. And the are slightly aero. See?
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No I don't. Ignore the mirror and look at that big chrome base between the door hinge and door handle. Consider modern practice on any new bus or fire truck. Technically a peep mirror, it is moved forward of the A-pillar — one of the most problematic areas.
Trends in bus aerodynamics
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That is sure a ugly bus....
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Proof of concept. In that thread at
Permalink #10, KamperBob posted the graph that relates to corner radius.
What's your frontal area? Assume six feet squared and 4" radius on the front edges. Find 0.055 on the dotted line.