Propeller Theory
Pressure up, speed down
What is Bernoulli's Principle?
Mimics operational forces during testing.
What is a test club?
Causes propeller blades to bend backwards from direction of rotation.
What is torque bending force?
Used to set air/fuel mixture.
What is the Condition Lever?
Used to measure prop angle.
What is a propeller protractor?
The actual distance travelled within one revolution.
What is Effective Pitch?
Can delaminate, causing an unusual sound when tapped on.
What is a Composite Propeller?
Pressure differential creating lift causes this twisting to high (coarse) pitch.
What is aerodynamic twisting force?
Provides the smallest blade profile during emergencies in this setting.
What is prop feathering?
Measurement of the magnitude of imbalance.
Inches-Per-Second (IPS)
Atmospheric Resistance
What is Relative Wind?
Mechanically controlled by the pilot.
What is a controllable pitch propeller?
Causes blades to bend towards airplane's direction of travel.
What is thrust bending force?
Propeller lever must be set at the highest rpm setting during this type of operation.
What is ground and/or beta operations.
Corrosion protection for a certain type of metal after repair.
What is alodine or oil?
Doing something to cause an equal reaction.
What is Newton's Third Law?
Is hydraulically controlled.
What is a constant speed propeller?
Strength of speeder spring tends to twist the blades in this direction.
What is low (fine) pitch?
When propeller angle and engine power is controlled by the same lever.
What is prop reversing or beta operation?
Used in smart phones to monitor screen orientation.
What is an accelerometer?
Having to make adjustments due to relative wind.
What is angle of attack?
Blade angle can be permanently re-pitched by bending.
What is an aluminum propeller?
This causes blades to twist into high (coarse) pitch from centrifugal force.
What are flyweights on the blade collars?
Used to control flow in a system with multiple flow channels.
What is a pilot valve?
This can delaminate and cause problems with imbalance, physical damage, and ice.
Electronic Deicing System or Deicing Boot.