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Hypersonic biplane

05.02.2018

A biplane is an aircraft with two wings, usually one above the other. This design allows you to get a large wing area and lift with a smaller wing span. Compared to a monoplane, a biplane requires a much smaller runway to take off and land. The wings of biplanes in the early days of aviation were usually made of wood and covered with fabric, but their low strength did not allow them to be made too large or to install a powerful engine.

The division of the bearing area into two planes has a beneficial effect on the dimensions of the aircraft, which causes a reduction in mass, as well as vertical and horizontal moments of inertia. Reducing the moments of inertia has a positive effect on the maneuverability of the device, and biplanes also have greater resistance to wing stall than monoplanes, due to the fact that it starts on the upper wing first - as a rule, carried forward and installed with a large angle of attack.

At the same time, the lower wing continues to perform load-bearing functions. Instead of falling into a tailspin, the biplane dips its nose and picks up the speed necessary to create lift. But the biplane also has disadvantages - for example, a higher profile drag caused by the presence of two wings. Another disadvantage is the mutual influence of the wings on each other, due to which the lift force increases by only 20% compared to one wing.

However, this does not stop Chinese engineers! As it became known, they are developing a promising hypersonic passenger biplane, the area of \uXNUMXb\uXNUMXbthe lower wings of which will be larger than the upper ones. When performing hypersonic flight, shock waves are formed on the lower wing, on which the upper wing will rest. The Chinese have already tested the model and made sure that the biplane is better suited for hypersonic flight than the monoplane.

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