Midterm FITB fill in the blank

Each blade of an aircraft propeller is essentially a/an _________

wing or airfoil

The ________ furnishes the power needed to rotate the propeller blades.

engine

_______ is the forward acting force applied to an aircraft in flight

Thrust

The _________ is the angle between the chord of the blades and the plane of rotation.

blade angle

___________ is installed on wooden propellers to provide protection against flying debris during ground operations.

Metal tipping

At takeoff when maximum power is required, the constant speed propeller will have a _____ blade angle, and _____ rpm.

low, high

A/an _______________ is a controllable propeller that has the ability to change the pitch to an angle so that the blade is 90 degrees to the apparent wind.

feathering propeller

A controllable propeller in which the blade angles can be changed to a negative value during operation is known as a/an ___________

reversible propeller

A/an __________ can be installed to help the propeller when unfeathering.

accumulator

_________ systems provide a means of controlling and synchronizing engine rpm.

Synchronization

If the propeller is operating above the rpm for which the control is set, it is called a/an ________ condition

overspeed

An _________ condition exists when the blades have moved to a higher angle than required for constant speed operation (hint: may cause engine rpm to lower)

underspeed

Synchrophasing systems are used with synchronization systems to further reduce ________ and _______

noise, vibrations

Fluid anti-icing systems transfer the deicing fluid from a stationary nozzle on the engine nose case to a/an ____________ mounted on the rear of the propeller assembly.

sling ring

Electric deicing systems use ______ and ______ to transfer electrical energy from the engine to the rotating propeller

slip rings and brushes

______ systems remove ice that has already formed on the propeller.

Deicing

Electrical deicing systems are usually designed for ___________ application of power to the heating elements.

intermittent

________ is the process of determining the positions of the tips of the propeller blades relative to each other.

Tracking

________________ results when the thrust of the blades is unequal.

Aerodynamic unbalance

Aluminum propeller blades and hubs should be cleaned regularly with __________

soap and water

A/an ____________ is a metal, wood, or plastic structure designed primarily to increase the flow of cooling air to the engine nacelle.

blade cuff

___________ force causes the greatest stress on the propeller

Centrifugal

Some aircraft-engine-propeller combinations have a critical operating range where continuous operation is forbidden.

Engine operation in the critical range can lead to ___________

Fatigue failure

For a given power setting (manifold pressure) on a reciprocating engine with a constant-speed propeller installed, engine rpm can be varied by __________

Changing blade angle

The feathering function of a controllable propeller is normally used only following __________ (what in-flight event?)

Engine failure

Describe the sequence of events that occur with a constant speed propeller when the engine rpm drops below the speed for which the governor is set

Flyweights in
Pilot valve down
Blade angle decrease
RPM rise to onspeed condition

What is the purpose of the reversible-pitch feature found on some propellers?

Reduce ground roll / improve stopping

During operation of a feathering propeller system, what occurs if the propeller governor oil pressure drops to zero for any reason?

Automatic feathering