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What does a pusher propeller do?
In an aircraft with a pusher configuration (as opposed to a tractor configuration), the propeller(s) are mounted behind their respective engine(s). According to British aviation author Bill Gunston, a “pusher propeller” is one mounted behind the engine, so that the drive shaft is in compression in normal operation.
What are the effects of propeller?
The propeller and its thrust cause a number of pitching moments. They may occur during a power change, speed change, and in steady flight, especially at high power and high angles of attack. Deflection of wing flaps tend to magnify these effects.
Why do you feather a propeller?
The inflight feathering of the propeller, on an engine that has failed or has been intentionally shut down, greatly reduces the drag that would occur with the blade pitch in any other position.
Are pusher props better?
A pusher propeller configuration offers several advantages over the traditional tractor arrangement. For instance, the wing of a twin‐engined aircraft is no longer exposed to the swirling and turbulent slipstream. This results in a much smoother wing inflow, a prerequisite for aerodynamic refinement.
What happens when a propeller is used as a pusher?
In pusher configuration, the propeller does not contribute airflow over the engine or radiator. Some aviation engines have experienced cooling problems when used as pushers. To counter this, auxiliary fans may be installed, adding additional weight.
When do you use a pusher aircraft configuration?
The configuration is also often used for unmanned aerial vehicles, due to requirements for a forward fuselage free of any engine interference. In a pusher configuration, the force provided by the propeller is pushing towards the engine, rather than away.
Where is the propeller located on an airplane?
Propulsion system efficiency is a function a range of factors, but intake losses, fuselage and propeller aerodynamic interactions and cooling are primary installation factors for efficient operation. Consider first the pusher layout, where the propeller is located behind the wing or fuselage.
How does a propeller affect the airspeed of an airplane?
Thrust provided by propellers increases the airspeed over the “blown” section of the wing improving the total lift produced in the effected section. This effect can, however, lead to substantial thrust effects due to changes in power output, which will be discussed later.