PROPELLER

46問 • 1年前

Nillo Jb

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In the early years of aircraft development all propellers were made of

wood

are the predominant material used in the construction of both fixed- and adjustable-pitch propellers.

Aluminum Alloys

are now being utilized because of their light weight and flexibility.

Composite Materials

was the most reliable material for fabrication of propellers for many years.

Wood

is more desirable than wood because it allows thinner, more efficient airfoils to be constructed without sacrificing structural strength.

Aluminum

propellers and blades are found primarily on antique and older generation transport aircraft.

Steel

propeller blades are slowly gaining in popularity.

Composite

permit the aircraft operator to change the propeller blade angle.

Adjustable Pitch

are constructed in a way that allows the blade angle to be changed when the aircraft is on the ground and the engine is shut down

Ground Adjustable Propellers

also called tilt sensor, clinometers or slope sensors, are designed to measure the angle of an object with respect to the force of gravity.

Inclinometers

have an advantage over ground adjustable propellers in that the blade angle may be changed while the propeller is rotating.

Controllable Pitch Propellers

One of the first controllable-pitch propellers that became popular was the Hamilton-Standard counterweight propeller.

Two-Position Propellers

One of the first controllable-pitch propellers that became popular was the

Hamilton-Standard Counterweight Propeller

At the center of the Hamilton-Standard two-position propeller hub is the

Spider

As technology advanced, the two-position propeller was improved to allow the operator to select any blade angle between the high and low pitch stops.

Multiple-Position Propellers

often called a variable-pitch or controllable-pitch propeller, is the most common type of adjustable-pitch propeller used on aircraft today.

Constant Speed Propellers

is typically mounted either on the front of an engine near the propeller shaft or on the engine accessory case

Propeller Governor

operate at high rotational speeds, all turboprop designs must incorporate a reduction gear assembly that can convert the engine's high speed, low torque rotational speed to a more usable low speed and high torque.

Turboprop Engines

assembly that can convert the engine's high speed, low torque rotational speed to a more usable low speed and high torque.

Reduction Gear

The combination of a turboprop engine's reduction gear assembly and propeller is often referred to as the

Power Section

the power section is driven directly by an (blank blank) through a fixed shaft.

Integral Turbine

In the other application, the power section is driven by a separate (blank or blank) that is not mechanically connected to the gas generator portion of the engine.

Power Turbine

is essentially a variable pitch, constant-speed propeller that is capable of operating with the propeller blades rotated beyond the normal low pitch limits.

Reversible Pitch Propeller

on a turboprop engine works in conjunction with the propeller governor to control the propeller blade angle.

Turboprop Fuel Control

are installed in aircraft to improve propeller performance and enhance the aircraft's all-weather capabilities.

Auxiliary Propeller Systems

Anytime multiple engines and propellers are installed on an aircraft, the potential for excessive vibration and noise exists.

Synchronization Systems

Prevents the formation of ice whereas

Anti-Icing System

Removes ice after it has accumulated.

De-Icing System

consists of a control unit, a tank that holds a quantity of anti-icing fluid, a pump to deliver the fluid to the propeller, and nozzles.

Fluid Anti-Icing System

which is adjusted to control the pump output.

Rheostat

is designed with a delivery tube for each propeller blade and is mounted on the rear of the propeller assembly.

Slinger Ring

consists of a power source, power relay, resistance heating elements, system controls, and a timer or cycling unit.

Electrical Propeller De-Icing System

are mounted on the engine case just behind the propeller while the Slip Rings are mounted on the back of the propeller hub assembly.

Brush Blocks

devices were first developed in the early 1920s by the B.F. Goodrich Corporation to remove the accumulation of ice on aircraft wings.

Deicing Boot

Deicing Boot devices were first developed in the early 1920s by the (blank) to remove the accumulation of ice on aircraft wings.

B.F. Goodrich Corporation

Propellers which allow changes in blade angle have removable blades that are secured to a hub assembly by a set of

Clamping Rings

has a flanged butt, or shoulder, which mates with grooves in the hub assembly.

Blade Root

is an airfoil-shaped attachment made of thin sheets of metal, plastic, or composite material.

Blade Cuff

can best be described as the force which tries to pull the blades out of the hub.

Centrifugal Force

on the other hand, attempts to bend the propeller blades forward at the tips.

Thrust Bending Force

occur as air resistance opposes the rotational motion of the propeller blades.

Torque Bending Force

results from the fact that, when a propeller blade produces thrust, the majority of the thrust produced is exerted ahead of the blade's axis of rotation.

Aerodynamic Twisting Force

opposes aerodynamic twisting force in that it attempts to decrease a propeller's blade angle.

Centrifugal Twisting Force

is the theoretical distance a propeller advances longitudinally in one revolution.

Propeller Pitch

are mounted on the front of an engine and pull an aircraft through the air.

Tractor Propellers

are mounted on the aft end of an aircraft and push an airplane through the air.

Pusher-Type Propeller

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