Definition
The strong, concentrated stream of air pushed rearward by a turning propeller. It flows directly over the fuselage, wings, and tail surfaces behind the propeller, and is strongest at higher power settings.
Plain English
The fast-moving column of air that the spinning propeller throws backward over the airplane.
Context Anchor
Encountered during engine start, taxi, run-up, approach, landing, and any power change near the ground.
Derivation
Blast' comes from Old English 'blæst', meaning a strong gust or blowing of air. It's used here in its plain sense — a forceful rush of air — produced by the propeller rather than by the airplane's motion through the sky.
Why Pilots Care
Propeller blast can damage nearby equipment, injure people, or affect other aircraft on the ground, so pilots reduce power and stay aware of its direction during ground movement.
Analogy
Similar to the strong wind a large box fan creates when pointed backward, but far more powerful and concentrated.
Intuition Check
Propeller blast does not mean an explosion. It means the strong stream of air produced by the spinning propeller.
Example Sentence 1
On the takeoff roll, propeller blast over the rudder gives the pilot directional control before the airplane is moving fast enough for the rudder to work on its own.
Example Sentence 2
Ground personnel stayed well behind the wing during the run-up so they would not be hit by the propeller blast.