# Have you ever seen an air show

As mentioned earlier, the flight of an airplane is a careful balance between thrust, drag, weight and lift. Should the lift decrease and the air resistance suddenly increase, e.g. B. when the angle of attack of an aircraft exceeds that for maximum lift occurs Standstill on. The airframe shakes and the plane falls, at least for a few meters. In most cases, the pilot corrects the stall simply by reducing the angle of attack of the aircraft. However, an incorrectly corrected stall can result in a secondary stall or worsen a spin.

If you've ever taken part in an air show, you've probably seen stunt pilots deliberately doing spins as part of an aerial acrobatics show. Typically, the propeller-driven aircraft will go up in a steep climb and then stall and turn dramatically. The principles of accidental spin are similar.

A spin has three basic phases. The initial phase is called starting spin where the falling plane begins to enter spin. This phase lasts only a few seconds in light aircraft.

If this is not corrected, an incipient spin worsens to one fully developed spin that consists of an almost vertical spiral trajectory - as if the aircraft were descending an invisible spiral staircase. Such a spin can cost an aircraft several hundred feet per revolution.

At a shallow spin the pitch and roll axes remain stable, with the spin occurring around the plane's center of gravity. In other words, the plane is mostly level as it is falling in an extremely dangerous turn.

Spin recovery techniques vary depending on the design of a particular aircraft and where its center of gravity is. In general, an aircraft with its center of gravity more towards the nose is less likely to enter a turn than an aircraft with its center of gravity closer to the tail. As such, some aircraft have special spin recovery procedures, but the idea is to upset the spin balance and force the craft to stall and from there return to controlled flight.

Most pilots don't want to take their passengers for a jaunt, however. You're too busy manning the flight instruments we'll talk about next.