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Originally Posted by Cycle
Unsure. There will be an effect at pretty much any speed that overcomes duct friction (which would be pretty low), but a noticeable effect, unknown.
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You could start by calculating the number of cubic feet per minute of airflow. Then given the heat rejected you can get the increase in volume. Without an air pump (inline fan) I don't see that adding much flow.
As for the inlets and outlets of the duct[s], I would think the outlet would want to be a narrow gill slit to maximize the body height that is affected.
PeterS -- I looked at the other thread. Keep in mind that a flat plate can generate lift through 'angle of attack'. For a tapering body in a crosswind, when the crosswind angle exceeds the taper of the sides, lift
will occur. Vortexes shedding off the sharp edges will increase drag. Sharp edges only work with a large fineness ratio like big-rig trucks and trains.