Amt 126 propellers

Question 1

are crucial for powered flight, transforming rotational motion into thrust. From ancient toys to modern aircraft, these blades have driven humanity’s journey through the skies.

Answer 1

Propellers

Question 2

Invented in ancient China (400 BCE), this simple toy demonstrated the principle of spinning blades generating lift.

Answer 2

Bamboo Copter

Question 2

A stick with blades that create lift when spun, showcasing the potential for rotary-wing flight.

Answer 2

Bamboo copter

Question 3

When was bamboo copter invented

Answer 3

400 BCE

Question 4

Leonardo da Vinci’s —– rotor, inspired by the bamboo-copter, was a significant step toward rotary-wing flight.

Answer 4

Helical Rotor/Leonardos aerila screw

Question 5

conducted early experiments with propellers, laying the foundation for practical designs.

Answer 5

Sir george clay

Question 6

when was The Wright brothers’ first successful powered flight utilized airfoil-shaped wooden propellers, a significant advancement.

Answer 6

December 17 1903

Question 7

Propellers declined in use with the rise of jet engines, which offered higher speeds and greater efficiency for long-haul flights.

Answer 7

JEt engine dominance

Question 8

p engines emerged for short- to medium-haul flights, offering efficient performance and quieter operation.

Answer 8

Turboprop Revival

Question 9

Modern materials like carbon fiber and advanced blade shapes have further improved propeller performance and efficiency

Answer 9

Advanced materials

Question 10

Rotating airfoils, converts the rotating power off the engine into thrust

Answer 10

Propeller

Question 10

parts of propeller

Answer 10

Tip, propeller blade, airfoil sections, propeller hub, root

Question 11

Mounted on the upstream end of a drive shaft in front of the suppporting structure.

major advantage of the tracter propeller is that a lower stresses are induced in the propeller

Answer 11

Tractor propeller

Question 12

Mounted on the downstream end of a drive shafr behind the supporting structure.

Answer 12

Pusher propeller

Question 13

Types of propeller connection

Answer 13

Tractor propeller, Pusher propeller

Question 14

Central portion of a propeller carried on drive shaft

Answer 14

Hub

Question 15

Permits a propeller to be mounted on the engine crankshaft or to a reduction gear assembly

Answer 15

Hub bore

Question 16

The portion of a propeller blade that is nearest the hub.

Answer 16

Blade shank/blade root

Question 17

It is the outer end of the blade farthest from the hub

Answer 17

Blade tip

Question 17

It is the curved surface of the airfoil

Answer 17

Blade back/Thrust face

Question 18

It is the surface of propeller blade that corresponds to the lower surface of an airfoil or flat side.

Answer 18

Blade face

Question 19

It is the cutting edge that slices into the air

Answer 19

Leading edge

Question 20

The edgve from the air leaves the blade

Answer 20

Trailing edge

Question 21

IT is an airfoil shaped attatchment made of thin sheets of metal, plastic, or composite material

Answer 21

Blade cuffs

Question 22

Basic parts of a propeller

Answer 22

Hub Hub bore Blade shank/Blade root Blade Tip Blade back/Thrust face Balde face Leading edge trailing edge blade cuffs

Question 23

an imaginary straigh line drawn between leading and trailing edge

Answer 23

Chord Line

Question 24

Is the angle between the chord of the blade and the plane of rotation and is measured at a specific point along the length of the blade.

Answer 24

Blade Angle

Question 25

An imaginary plane perpendicular to the shaft

Answer 25

Plane of rotation

Question 25

Rotation around a fixed axis.

Answer 25

Axis of rotation

Question 26

The angle formed by the chord line of the blade and the relative wind.

Answer 26

Angle of attack

Question 27

Simply a reference position on a propeller blade that is specified distance from the cneter of the hub

Answer 27

Blade station

Question 28

Refers to a changing chord line from the blade root to the tip

Answer 28

Blade twist

Question 29

The variation in airfoil shape and blade angle along the length of a propeller blade compensates for differences in rotational speed and allows for a more even distribution of thrust along the blade.

Answer 29

Propeller blade element theory

Question 30

is the distance in inches, which the propeller would screw through the air in one revolution if there were no slippage

Answer 30

Pitch

Question 31

the theoretical distance a propeller should advance in one revolution.

Answer 31

Geometric pitch

Question 32

It is the actual distance a propeller advances in one revolution.

Answer 32

Effective Pitch

Question 33

The difference between the propellers geometric pitch and the effective pitch. It is a critical statistic that directly affects performance.

Answer 33

Propeller slip

Question 33

Materials used for different types of propellers

Answer 33

Wood Aluminum Alloy Steel Composite Material