What is the shape of most airfoils designed for aircraft?

The shape of most airfoils designed for aircraft is teardrop, which is specifically crafted to optimize aerodynamic performance. This shape allows for a smooth airflow over the surface of the wing, reducing drag while producing lift efficiently. The broader, rounded leading edge helps in gradual airflow attachment, which minimizes turbulence and flow separation, especially at lower speeds. The tapered trailing edge creates a streamlined exit for the airflow, further enhancing performance.

Airfoils with a teardrop shape can maintain lift across a range of angles of attack, making them versatile for various flight conditions. This shape also helps to balance lift generation with drag, which is critical for fuel efficiency and overall aircraft performance. Therefore, the teardrop shape is a well-established and widely used design in aviation to ensure effective flight characteristics.