What fluid is generally used in propeller fluid anti-icing systems?

What fluid is generally used in propeller fluid anti-icing systems?

• A. Ethanol
• B. Glycerin
• C. Water
• D. Isopropyl alcohol

Answer: (B)

Protecting the propeller blades from ice requires a fluid that can be sprayed as a thin, persistent film and stay effective in the cold and on the moving surface. Glycerin fits this role well because it remains viscous and adheres to blade surfaces, forming a lasting coating that resists ice buildup. It also has a low tendency to evaporate away quickly, helping the film stay in place during flight, unlike alcohols that evaporate fast or water that can freeze and wash off. The result is a reliable, non-corrosive anti-ice layer on the propeller. Water would freeze in typical icing conditions and evaporate or fail to provide a lasting film; ethanol and isopropyl alcohol evaporate too quickly to offer durable protection.

Protecting the propeller blades from ice requires a fluid that can be sprayed as a thin, persistent film and stay effective in the cold and on the moving surface. Glycerin fits this role well because it remains viscous and adheres to blade surfaces, forming a lasting coating that resists ice buildup. It also has a low tendency to evaporate away quickly, helping the film stay in place during flight, unlike alcohols that evaporate fast or water that can freeze and wash off. The result is a reliable, non-corrosive anti-ice layer on the propeller.

Water would freeze in typical icing conditions and evaporate or fail to provide a lasting film; ethanol and isopropyl alcohol evaporate too quickly to offer durable protection.