What does the 'hot wing' method utilize to prevent ice formation?

The 'hot wing' method utilizes warmed air from the engines to prevent ice formation. In this system, hot air is bled off from the engine, which then flows through ducts within the wing structure. This process raises the temperature of the airfoil surface, effectively melting any ice that may begin to accumulate during flight in icing conditions.

By using heated air, this approach is particularly effective in maintaining the aerodynamic performance of the wings, ensuring that ice does not disrupt airflow and compromise lift. It is a practical application of thermal control to enhance safety in adverse weather conditions.

In contrast, options such as cold bleed air and insulated wing designs do not provide the necessary heat to counteract ice formation, while electrical heating elements represent a different method of ice prevention that is not part of the 'hot wing' approach. Thus, the effectiveness of the hot wing method hinges on the use of warmed air from the engines, making it a reliable solution for preventing ice buildup in critical flight surfaces.