The portholes in the plane

reason is ridiculously simple: square portholes. It was one of those annoying little things that are easy to miss in the design; but as soon as something happens, they become obvious even a child.

Square window consists of four 90-degree recesses, and therefore, it has four weaknesses. If your house pressed, the crack will certainly be passed through a corner of a window.

Have you noticed that the windows all round the aircraft? This is not Beauty - round shape does not allow the plane to break apart. The pressure is distributed across the curve instead of going to the cracks in the corners (as it turned out) and break the plane apart.

Believe me, it was not easy to figure out. Experts had no idea why the design of the aircraft falling apart, until the structure tested by repeated simulation of pressure on the cockpit. Of course, the fuselage, eventually burst, and the gap began precisely with these notorious corners. Since then, all the windows of airplanes only round.

Source: mirfactov.com/