FAA Powerplant Written Practice Test

The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to?

1. Enhance engine aesthetics

2. Force cooling air into close contact with all parts of the cylinders

3. Reduce noise produced by the engine

4. Support structural integrity of the engine

The correct answer is: Force cooling air into close contact with all parts of the cylinders

The primary purpose of baffles and deflectors in air-cooled aircraft engines is to ensure that cooling air is effectively directed into close contact with the surfaces of the cylinders. These components are designed to create a controlled airflow, enhancing the cooling efficiency of the engine. By directing the airflow precisely where it is needed, baffles and deflectors help to maintain optimal operating temperatures, thereby preventing overheating and improving overall engine performance. Proper airflow is crucial in air-cooled engines, as uneven cooling can lead to thermal stress and potential damage. The strategic design of the baffles and deflectors facilitates a more uniform temperature distribution across the engine, effectively managing the heat produced during combustion. In contrast, improving aesthetics, reducing noise, and providing structural support, while potentially secondary benefits of organized airflow, do not directly relate to the primary function of enhancing cooling efficiency in air-cooled engines.