Definition
A lightweight aircraft structural core material made of thin sheet metal formed into a grid of small square or rectangular pockets, bonded between two face sheets to produce a strong, rigid sandwich panel.
Plain English
A grid-patterned metal layer placed between two thin skins to make a panel that is light but stiff. The grid looks like the pattern of a breakfast waffle, which is where the name comes from.
Context Anchor
Seen during preflight or maintenance inspection of aircraft skin, cowling, doors, panels, or control surfaces.
Derivation
Named after the breakfast waffle because the metal core has the same repeating pocketed grid pattern. The visual likeness is the whole point of the name — it tells you what the material looks like.
Why Pilots Care
Waffled blades require inspection and possible repair or replacement because the dents create stress points that can lead to cracks or blade failure.
Intuition Check
Waffle does not mean changing your mind here. It means a visible uneven pattern or distortion in an aircraft metal surface.
Example Sentence 1
The technician inspected the waffle core for signs of corrosion before bonding the new face sheet in place.
Example Sentence 2
The mechanic noted the waffle damage and grounded the aircraft until the blade could be evaluated.