In the early aviation industry, airplane windows were all square in design.

Everyone knows that airplane windows are usually only oval, not square or rectangular.

In fact, in the early aviation industry, passenger planes adopted window designs.

Why are airplane windows oval and not square or rectangular?

The first commercial airplanes had square windows.

In the early days, commercial passenger aircraft windows were square in design.

On May 2, 1952, the world’s first commercial aircraft with square windows, named De Havilland Comet, was put into operation.

Unable to find the black box, to investigate this accident, the authorities had to salvage rubble over an area of up to 260km2.

16 days later, another tragedy continued to happen.

With what remained from the accident, the investigation team tried to analyze and found that in both incidents, the bodies recovered showed signs of skull damage and traces of lung explosion.

The investigation team speculated that the plane may have exploded due to pressure.

When an external force is applied to an object, stress, a quantity representing the internal force arising in the deformed object, appears.

Why are airplane windows oval and not square or rectangular?

Currently, airplane windows are designed in an oval shape

The higher the plane goes, the greater the pressure difference between inside and outside.

On the fuselage, stress will spread through the details, including the windows. If the windows are square or rectangular, it will cut off the stress flow.

In contrast, oval windows have no edges, so there is no concentrated point of impact.

This principle also applies on ships, boats or spacecraft.