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You've been taught that there is high pressure on the
bottom of the wing, well, that's just not so! Yes, the
pressure on the bottom of the wing is lower than on the top when lift is being
developed with the plane not inverted. But, with our airfoils that have
curvature on the bottom as well as on the top, the pressure on the bottom of the
wing is below static. What that means is if the interior of the wing is vented
to the cabin or other source of near-static pressure, there may exist a flow
from the inside of the wing through any un-sealed gaps around the landing gear
doors. Typically, that flow will exit perpendicularly to the flow on the
surface, just as in the gaps on the control surfaces, making drag. Have any of
you tried to put some sealing foam around the cutouts to prevent
this?
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