What is a propeller and how does it produce thrust?
An aircraft propeller is an aerodynamic device that converts rotational energy into propulsive force creating thrust. It does this by accelerating a large mass of air rearwards.
The rotational energy can be produced by a piston or gas turbine engine.
Basic construction of a propellor
- A propeller consists of two or more aerodynamically shaped blades attached to a central hub. Which is then mounted on a shaft driven by the engine.
- A propeller blade has a root, tip, a leading edge and a cambered cross section.
- The chord line is an imaginary line drawn through the blade from its leading edge to its trailing edge. As in a wing, the leading edge is the thick edge of the blade that meets the air as the propeller rotates.
- Blade angle is the angle between the blade and the plane of rotation, also commonly known as the pitch.
- Flat portion of the propeller attached to the Hub is known as the Shank.
What is the difference between Geometric Pitch and Effective Pitch
|Geometric Pitch||Effective Pitch|
|It is the distance the propeller would travel forward in one complete revolution if it were moving through the air at the blade angle.||The distance which it actually moves forward in each revolution is called “ effective pitch”.|
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