How is engine oil cooled in the UH-60S?

How is engine oil cooled in the UH-60S?

• A. Air cooled fins
• B. Liquid to liquid cooler, oil flow through the scroll vanes
• C. Oil in heat exchanger with air flow
• D. Water cooled block

Answer: (B)

Oil cooling in the UH-60S uses a liquid-to-liquid heat exchanger. In this setup, the engine oil flows through passages in the cooler where it is cooled by a separate liquid coolant that circulates in a closed loop. The cooler’s internal path includes scroll vanes that guide and swirl the oil, increasing the contact with the cooling liquid and improving heat transfer. This arrangement keeps oil temperatures steadier during high-power operation and in hot environments, even when air flow is limited in hover. It’s more robust under varied flight conditions than relying on air flowing over a radiator alone, and it uses the same coolant loop already circulating through the engine’s cooling system.

Oil cooling in the UH-60S uses a liquid-to-liquid heat exchanger. In this setup, the engine oil flows through passages in the cooler where it is cooled by a separate liquid coolant that circulates in a closed loop. The cooler’s internal path includes scroll vanes that guide and swirl the oil, increasing the contact with the cooling liquid and improving heat transfer. This arrangement keeps oil temperatures steadier during high-power operation and in hot environments, even when air flow is limited in hover. It’s more robust under varied flight conditions than relying on air flowing over a radiator alone, and it uses the same coolant loop already circulating through the engine’s cooling system.