My friend Ron decided to build his own airplane—a Vans RV-7A. A few days ago he invited me to help him put a wing together. Seeing it reminded me that we make airplanes out of really flimsy stuff.
The outer skin of your average airliner is only about ⅛” thick. Ron’s bird—lighter, slower, carries only two people—sports a hide just over 1/64” thick. How will that metallic tissue keep him safe three miles above the ground when he flies 200 miles per hour for 900 miles?
Turns out it depends on how we stick it together. We could, for example, scrunch up aluminum foil, adding wad to wad, until we fabricated a substantial, solid mass. It might be robust but would weigh too much to fly and leave no room for motors, fuel, cargo, passengers or even, oh yeah, the pilot. Fortunately, the Germans developed a method a hundred years ago to make the skin a structural member rather than just streamlining. The technique, not widely used until the 1940’s, later acquired a French name: monocoque that literally means “single shell.”