MISC Flashcards
What is the difference between effective and geometric pitch known as
Slip
What is the coriolis effect
When the centre of mass moves closer to the centre of rotation the rotational speed increases
What is the purpose of a transmission
Convert low torque, high RPM engine power into low RPM high torque
What are 5 propeller safety devices
Pitch lock Auto feather Prop brake Negative torque system De coupling
How is flapping and dragging achieved in a fully rigid rotor system
Blade flex
Elastomeric bearing
What is thrust bending force
Thrust bending force exerts a pressures that tends to bend the propeller tips forward
Which force acting on a propeller tries to flatten the blade out
centrifugal twisting moment
What is torque reaction
The aircraft wants to roll in the opposite direction to the propellers rotation
Where are blade stations measured from
Center or rotation
What are the two iced removal methods for propellers
Electrical heating elements
Chemical
What does the dome ASSY house
pitch change mechanism
How is dsymetry of lift countered
Flapping to equality
What is the purpose of a blade cuff
improve airflow around the shank
send cooling air to the engine nacelle
What three purposes does a propeller hub serve
Hold blades in place
Secure prop to shaft
Transfer torque from engine into thrust
How is coning angle measured?
What does spanwise imbalance imply?
One blade being heavier than the other
Corrected by adding weight
What does chordwise imbalance imply?
Blades being out of alignment
Corrected by sweeping the blades
What does vertical imbalance imply?
Out of track rotor
Occurs when the blades are not following the same tip path plane
Corrected by altering either the blade trim tab or pitch change link
What are the 3 main components of a governer?
Fly weights
Pilot valve
Pump
How does a propeller produce thrust
What 2 things do blade cuffs do?
What are the 3 purposes for the barrel assy?
What is the difference between centrifugal twisting moment and aerodynamic twisting moment?
what indicates an imbalanced propeller whilst vertically statically balancing?
