Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
To change the blade pitch of a propeller from the feathered high
pitch, which prevents airloads from causing it to windmill, to a
lower pitch. When a propeller is unfeathered in flights,
aerodynamic forces produced by air flowing over the blades case the
propeller to turn the engine.