What is a commonly applied electrical method for propeller ice control?

The commonly applied electrical method for propeller ice control involves the application of electrical heat to the blade root. This technique works effectively because the blade root is close to the hub, where heat can be distributed more uniformly across the blade. When electrical heat is applied, it raises the temperature at the root, which then helps to prevent ice formation and can also facilitate the melting of any existing ice on the blades as the heat radiates outward toward the tips.

This method is preferred because it allows for continuous operation without requiring significant structural changes to the propeller assembly. It utilizes a controlled application of heat, thereby minimizing the risk of damage due to excessive temperature fluctuations.

The other options are not typically employed for this purpose. For instance, applying electrical current to the blade tip may not be as effective since the tip is farther from the heat source, leading to uneven melting and greater potential for ice accumulation. Electrical shock to the entire assembly is impractical and dangerous, as it does not provide a controlled or sustainable method for ice removal. Additionally, electrical insulation of the propeller would inhibit the transfer of heat necessary for effective ice control.