Sorry to digress, but "wet wings"?
In 35 years working around aeroplanes I have never heard this expression before. Just curious where it comes from.
If you mean "integral fuel tanks" then standard construction of a wing is a front and rear main spar with ribs between the two and upper & lower skin to create the fuel void. Depending on type the void may have baffles between the ribs or the ribs act as baffles to stop the fuel sloshing around and acting as a 'ram'.
Hope this helps.
