Definition
Sheet-metal panels installed around an air-cooled aircraft engine that direct ram airflow over and between the cylinders to ensure even cooling during flight and ground operations.
Plain English
Metal pieces around the engine that guide the incoming air so it flows where the cooling is needed, instead of just rushing past.
Context Anchor
Seen during engine inspection and before-takeoff checks when confirming that the engine cooling system is intact and nothing is loose, damaged, or missing.
Derivation
From the older English verb 'baffle,' meaning to block, deflect, or divert. In the engine, the panels deflect airflow rather than letting it pass straight through, which is exactly what the word originally meant.
Why Pilots Care
Missing, loose, or damaged baffles allow cooling air to escape or recirculate, producing hot spots that can lead to cylinder damage, detonation, or in-flight engine failure.
Analogy
Think of baffles like the cardboard dividers inside a box that keep items in place and channel space. In an engine, the baffles keep air from wandering and guide it over the hot areas.
Intuition Check
“Baffles” does not mean that something is confusing here. In this context, baffles are physical parts that guide and control airflow.
Example Sentence 1
During preflight, the pilot checked the engine baffles for cracks or gaps that could disrupt cylinder cooling.
Example Sentence 2
Cracked baffles allowed hot air to bypass the cylinders, causing elevated cylinder head temperatures during the climb.