Definition
Sheet-metal deflectors fitted between the cylinders of an air-cooled aircraft reciprocating engine that direct the cooling airflow around each cylinder so that heat is removed evenly from the cylinder fins.
Plain English
Thin metal pieces placed between the engine's cylinders that guide the incoming air so it flows around every cylinder, keeping all of them at a similar temperature.
Context Anchor
Seen during engine inspection, cowling removal, and discussions of air-cooled engine temperature control.
Derivation
Inter- comes from Latin meaning 'between.' Baffle originally meant something that blocks or redirects. Together: 'between-cylinder deflectors' that redirect cooling air.
Why Pilots Care
Properly installed baffles prevent localized overheating, reduce the risk of cylinder damage, and support reliable engine performance and longevity.
Intuition Check
Baffles does not mean “confusing things” here. In this context, baffles are physical guides that control where cooling air goes.
Example Sentence 1
During the annual inspection, the mechanic found a cracked intercylinder baffle on the number three cylinder and replaced it before signing off the engine.
Example Sentence 2
Damaged intercylinder baffles can cause uneven cooling and higher cylinder head temperatures during climb.