FAA Powerplant Written Practice Test

What is the main purpose of baffles and deflectors around cylinders of air-cooled aircraft engines?

1. To enhance fuel efficiency

2. To keep engine temperature stable

3. To channel cooling air to the cylinders

4. To support the engine structure

The correct answer is: To channel cooling air to the cylinders

The primary function of baffles and deflectors around the cylinders of air-cooled aircraft engines is to channel cooling air directly to the cylinders. This is crucial because air-cooled engines rely on airflow to dissipate heat generated during operation. The design of baffles and deflectors helps direct the incoming air in a manner that maximizes cooling efficiency by ensuring an adequate amount of air is delivered to each cylinder. By controlling the flow patterns, these components prevent areas of the engine from overheating, as they create a more uniform cooling effect. Effective airflow distribution helps maintain optimal operating temperatures, ensuring the engine performs efficiently and remains reliable during flight.