Propeller Fundamentals and Forces

What is the primary purpose of the aerofoil shape in propeller design?

What force opposes thrust and is caused by the disruption of airflow over the propeller?

Thrust is the reaction to the mass of air being accelerated rearwards. On what part of the propeller blade is this force primarily felt?

In the context of propellers, what two pairs of forces contribute to the total reaction?

Which statement best describes blade angle?

What reference point is generally used when measuring blade angle?

In the designation 'M74DMS5-2-60' for a Sensenich propeller, what does '-60' indicate?

What is the term for the angle between the chord line of a propeller and the relative wind/airflow?

What is the result of a propeller reaching the speed of sound at the blade tips?

What is propeller pitch?

What is propeller slip defined as?

If a propeller has a geometric pitch of 50 inches and an effective pitch of 35 inches, what is its efficiency, assuming no other losses?

What is the effect of propeller torque on aircraft stability if the propeller is being driven anti-clockwise?

What is the effect of a rotating propeller's slipstream on the aircraft's fin?

What effect does fitting a contra-rotating propeller have on propeller torque and gyroscopic effect?

What force tends to throw rotating propeller blades away from the propeller hub?

Which force tends to rotate propeller blades toward a fine blade angle on variable pitch propellers?

Which force attempts to move the propeller blades to a coarser blade angle?

Which force bends the propeller blades opposite to the direction of rotation?

Which force bends the blades forward as the aircraft is pulled through the air?

What happens to the angle of attack if forward velocity is maintained, but rotational velocity is increased?

What is the effect of increased forward velocity on the relative airflow and angle of attack, if rotational velocity is maintained?

What is the most critical location for concentrations of vibrational stress on a propeller blade?

Propeller blades are commonly constructed using what material?

Which of the following defines the leading edge of a propeller blade?

What is the purpose of the chord line on a propeller?

What is the function of the hub assembly?

Which description summarizes the purpose of propeller blade cuffs?

What material is commonly used for leading-edge sheathing on wooden propellers?

What is the purpose of anodizing aluminum alloy propeller blades?

What is the purpose of shot peening?

In composite propeller construction, what material is commonly used to form the blade profile?

What are the types of propeller mounting installations?

What is the function of the keyway in a tapered propeller shaft installation?

For a flanged propeller installation, how the propeller properly secured?

What type of gauge is used to check splined shaft wear?

When installing a propeller, in addition to being fully torqued, what percentage of blue ink transfer should there be to a propeller hub?

Which propeller type has blades that can have their pitch altered while the propeller is rotating?

What is the function of a propeller governor?

What is 'feathering' a propeller?

Which is the effect of 'reversing' a propeller?

When does 'Alpha mode' come into effect?

What is the primary purpose of a propeller synchronizing system?

How does synchrophasing differ from simple synchronizing with respect to propeller operation?

In a turboprop engine with FADEC, what operational mode is typically engaged during the engine start sequence while the aircraft is on the ground, and the condition lever is set to 'run'?

What term is used to describe systems designed to prevent the formation of ice on propellers?

To protect wooden propeller blades, what does the text indicate should be secured around the tip and along the leading edge?

Why is it essential to limit engine operation in a critical range as indicated by a red arc shown on an engine’s tachometer?

What should always prevent any one side of double-action Hydromatic propellers?