What inlet duct is primarily used for turboprop engines?

The streamlined spinner is the ideal choice for turboprop engines primarily because of its aerodynamic design, which helps optimize airflow into the engine. This design minimizes drag and allows for smooth air entry, which is crucial for efficient engine operation. The streamlined shape effectively directs airflow towards the engine inlet, enhancing performance by allowing for better mixing of air and fuel and reducing the risk of flow separation.

Such an inlet design is particularly beneficial for turboprop engines, which operate at lower speeds and require efficient airflow management to maximize thrust and efficiency. By minimizing turbulence and ensuring a steady stream of air, the streamlined spinner can significantly contribute to the overall performance of a turboprop engine.