CASA B1-17 Propellers: Fundamentals I

What is the primary aerodynamic effect that causes lift on a propeller blade?

What does the '74' component indicate in a Sensenich propeller designated M74DMS5-2-60?

To ensure uniform thrust across a propeller blade, what design feature is incorporated?

What is the effect on propeller efficiency if the tip speed reaches the speed of sound?

Which of the following defines propeller slip?

What is the effect of propeller torque on an aircraft?

What action does a propeller in straight and level flight take to resist any change in its plane of rotation?

The use of contra-rotating propellers is mainly for?

Which force tends to bend propeller blades FORWARD?

Which best describes the effect of increased rotational velocity on a propeller, when forward velocity is maintained?

What primarily causes mechanical vibrations in a propeller?

Which materials are suitable for propeller blades?

What is the purpose of 'leading-edge sheathing' on a wooden propeller?

What best describes CTM or 'Centrifugal Twisting Moment'?

Which of the following best illustrates force from aerodynamic twisting moment?

What best describest propeller hub?

What best illustrates the purpose cuffs.

What is a defining characteristic of fixed pitch propellers?

What controls blade angle in a constant-speed propeller system?

What best describes the term the counter rotating in aircrafts?

What result does the feathering capabilities provide?

What provides for propeller rotation stops on multi engine propellor.

For Reversing propellers what assists in ground handling by allowing the aircraft to be taxied backwards?

Why is it important to be aware of some systems having Torque?

If NTS system fails, what prevents torque?

Why use a propeller brake?

A torquemeter system measures?

What is the procedure to check balance of a three-bladed propeller assembly?

Correct operation of a propeller that has been installed is done by which check?

In relation to light aircraft track requirements, what are the track limits for wooden propellors?

For correct installation, what checks should include inspecting the flange for?

A good best identifies how a splined shaft and hub are properly connected?

In regards to installing turbine engines. what is the function for back and front usage of tapered cones?

What does a tachometer measure?

What is considered for Engine Power Requirements and Performance Factors?

What does propeller construction use?

What does Laminating consist of?

To help protect wooden propeller blades, what is secured around the tip?

What is metal propeller process itself a finishing treatment?

What component does the power lever connect during the reverse to ground idle power lever movement?

To ensure they are airtight, which type of blades use electroplating?

What fundamental property is quantified for momentum?

What happens when rotational speed is increased equally on the forces of equal speed?

While a propeller is rotating, which of the following describes the force resulting from air resistance acting on the blades?

How does drag impact bending force that is acted upon blades?

What is counteracted by aerodynamic and mechanical forces that leads to occurrence?

Where is a critical location found in a blade for concentration of vibrational stress?

Why is the blade manufactured to have a gradual twist hub to tip?

What results from the combination of centrifugal force and thrust?

What is the typical material composition of propeller blade cuffs?

Why did the need increased, to keep blade tip below the speed of sound?

What materials are commonly applied to shaped propeller for coatings, after shaping?

What describes laminated construction when using timber?

What purpose is served by the small drain holes found in leading-edge sheathing?

What materials can leading-edge sheathing be made from?

What substance is used to give aluminium alloy blades extra protection?

What is the function of lead-edge sheathing?

What is verified and ensured a tight but sliding fit to prevent fretting and wear?

What does the hub assembly ensure during variable-pitch propellers?

A reference measuring point is necessary because

What is the purpose of the reference measurement and it's generally accepted measurement?

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

Define the function of 'Tractor propellers'.

In what units measure splined shaft tolerances?

What is the purpose of fitting a skull cap spinner?

What component controls the speed a constant-speed propeller to maintain a selected engine speed?

What condition relates to a propeller designed for twin engine aircraft, by maintaining single-engine performance to make it controllable?

With the blade chord parallel to the direction of flight, which of the following describes a mechanism to change the blade angle?

What is the main purpose behind reverse thrust?

Why is it important that the aircraft is on the ground?

What is the effect of selecting reverse in the cockpit?

The propeller must be able to absorb the power provided to it by the engine?

Other than increasing diameter, how can a propeller absorb more power?

If a propeller is 1:10 in solidity, what does the 10% refer to?

Which of the following procedures are a way to increase a propeller's solidity?

What is the purpose of a propeller spinner assembly?

What is the purpose of electric pitch change mechanism?

How does the FADEC system detect a failed engine?

Given descriptions, what describes the system settings of 'Beta mode'?

What is the advantage of a hydro-mechanical overspeed governor supplying emergency?

What part does the pilot valve play in a single acting governor?

What is the result when the governor is at the required settings?

What describes feathering a propeller?

What happens with a rotating propeller and the force of the speeder spring becomes compressed?

To initiate the feather capability in the simple hydromatic propeller, what becomes necessary?

After feather button is pressed

How can the total reaction on a propeller blade be best described?

What indicates the propeller blade angle?

What is the effect of blade twist on a propeller designed for equal thrust production?

Which of the following explains 'geometric pitch' in propeller theory?

What determines the effect of propeller torque on an aircraft's stability?

Which of the following describes the impact of propeller slipstream on an aircraft fin?

Aerodynamic Twisting Moment (ATM) tends to force blades which direction?

What effect does torque bending force have on propeller blades?

At what point on a propeller blade is vibrational stress concentration typically greatest?

Why large amount of power that engines can develop, is it difficult to keep blade tip speed below the speed of sound?

What materials are commonly used for manufacturing propeller blade cuffs?

In laminated wood propeller construction, what is the purpose of using well-seasoned hardwood?

During wooden propeller construction, what function does varnishing perform?

What is the specific purpose of the small drain holes found in the leading-edge sheathing of wooden propellers?

What electroplating process is used to added extra protection and alloy blades?

What is applied to aluminium alloy blades to provide extra protection?

What is the function of the hub assembly in a variable-pitch propeller system?

To prevent a propeller's rotation after the engine has been shutdown. what device is fitted?

In turboprop engine what does the FADEC system do if it detects a propeller overspeed?

The purpose of adding a governor to a propeller on an aircraft with a constant speed?

What is lift?

The angle between the chord line and plane of rotation is termed the _____ angle.

What is the typical angle of attack for best results?

Why are propeller blades manufactured with a gradual twist from hub to tip?

What is propeller slip?

What effect does propeller torque have on aircraft stability?

What is gyroscopic effect?

Which forces are acting on a propeller?

What is the purpose of propeller blade cuffs?

How can power absorption be increased without increasing propeller diameter?

Why is aircraft directional control adversely affected by air rotation in the propeller slipstream?

How is the adverse effect of air rotation in the propeller slipstream mitigated?

Counter-rotating propellers are the same as contra-rotating propellers

What is the definition of feathering?

Reversing is the process of moving blades until they are approximately parallel to the direction of flight-stopping windmilling and drag.

What actions does alpha mode control?

What factors should be considered when selecting a propeller?

What is the objective when adding a governor to a propeller?

What do propeller governors with single-action assist with?

A protective covering installed for wooden propeller blades is called leading-edge _____.

How are splined propeller shafts kept in place?

What does the propeller blade's tip speed need to be?

Lift is the aerodynamic force caused by:

What is the term for the angle between the chord line and the plane of rotation of a propeller, measured in degrees?

The angle between the chord line and angle of relative wind/airflow is termed what?

What is the term for the distance a propeller moves forward in one revolution?

Slip is defined as the difference between _____ pitch and effective pitch.

If a propeller is being driven anti-clockwise, the torque that is being developed to drive the propeller has an effect on the aircraft structure and will tend to roll the aircraft clockwise.

What are the forces that act upon a propeller?

A propeller blade is an _____ shape.

Which of the following materials are propeller blades typically made from?

What part of the propeller blade first meets the air as the propeller rotates?

What is the cylindrical part of the blade near the blade root called?

What is the propeller blade tip?

What name is given to devices designed to restore the round section of the blade shank to an aerofoil shape?

Name one method used to protect fixed wood propellers from damage.

What material has anodising is used to add extra protection to?

What is the process for metals designed to distribute stresses more evenly in the surface?

What is use to protect the surface of Wooden propellers from moisture?

Select the types of propeller mounting installations?

What name is given to propellers that are conventionally mounted in front of the engine power plant?

What name is given to propellers that are mounted on a drive shaft from the rear of the engine, producing thrust to 'push' the aircraft forward.

What name is given to the kind of propeller with a blade angle that cannot be changed?

What name is given to the term for when propellers are two separate propellers mounted in line on two concentric shafts which rotate in opposite directions.

The term counter-rotating refers to a twin-engine application in which the propellers on each engine turn in opposite directions of rotation to counteract torque reaction and gyroscopic effects.

What is the purpose of feathering multi-engine propellers?

Give one reason for reversing propellers.

The propeller must be able to absorb the _____ provided to it by the engine; otherwise, the propeller will race (speed up) and both propeller and engine will become inefficient.

To reduce the overall size of a propeller, what is one method used?

What is the benefit of spinner on a propeller?

What is the purpose of propellers Synchronising?

Describe what happens, during synchronizing, if the master and slave signals are different.

Define synchrophasing

The function to limit the speed of the propeller on a gas turbine is as follows:

What is fluid anti-icing?

Anti-icing system can be selected ON whenever the aircraft is operating in suspected icing conditions.

Give one of the types of anti-icing fluid

Define electrical de-icing

When flying into icing conditions, it is normal practice to switch on the de-icing system as a precaution prior to any indication of ice accumulation.

Before carrying out repairs on a propeller where damage has occurred name one factor that must be be established?

After a propeller is installed, the engine need not be be ground-run to check propeller operation.

How Should propellers be stored?

What is the aerodynamic force caused by air flowing over an aerofoil?

What is a force opposing thrust, caused by the disruption or impact of airflow over, or onto, an aerofoil?

What is a forward-acting force?

What is blade angle?

What is angle of attack?

If a propeller is being driven anti-clockwise, what effect does it have on the aircraft structure?

As a propeller is rotating, it is acted upon by certain forces. Which of the following is NOT one of those forces?

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

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

What force tries to move the propeller blades to a coarser blade angle?

What force is divided into Torque bending force (caused by drag) and Thrust bending force (caused by thrust).

What is the term for the location about 6 in. from the blade tips where the most critical location of vibrational stress occurs?

Propeller blades are usually made of one of the following. Which is NOT one of those materials?

What is the thick edge that first meets the air as the propeller rotates

What is the curved face of the propeller aerofoil that joins the leading and trailing edge?

What is the flat side of a propeller blade known as?

What is an imaginary straight line drawn through an aerofoil, cutting through the center of the leading edge and the center of the trailing edge, known as?

To assist maintenance personnel in locating relevant positions on a blade, the blades have designated distances along their length as measured from the centre of the hub out to the tip of each blade. What are these known as?

What assembly provides a means of attaching the propeller to the engine and supports the blades?

What is the round blade root, also known as, which is the part of the propeller blade which fits into the propeller hub?

What part of the blade is the cylindrical part of the blade near the blade root?

What is the aerofoil part of the propeller that converts the torque of the engine into thrust?

What is the portion of the blade farthest from the hub assembly?

What are propeller blade cuffs designed to restore?

What is timber used for the manufacture of propellers specially selected for?

Wood used in propellers can have loose knots

How is a metal shield secured around the tip and along the leading edge, to protect wooden propeller blades?

Leading-edge sheathing can be made from a few different materials. Which is NOT one of those?