Dad Joke thread (everybody welcome)

Not my own:
A flight instructor is conducting a preflight inspection with a new student. As they get around to the nose, the instructor taps on the prop.
“Hear that?”
The student nods. The instructor taps the prop closer to the hub.
“Now, hear that?
The student nods again.
“Do you know why it sounds different?”
“Uhhh… no.”
“It’s a variable-pitch prop!”
:rolleyes:
 
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