AMT 126 REVIEWER

Question 1

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

Answer 1

Early 1500s (Leonardo’s Aerial Screw)

Question 2

Modern materials like _____ and ____ have further improved propeller performance and efficiency.

Answer 2

carbon fiber and advanced blade shapes

Question 3

____ experiments enabled the wright brothers to achieve over 80% thrust efficiency with their propeller designs

Answer 3

Wind Tunnel Testing

Question 4

distributed across the aircraft, improve efficiency and reduce noise pollution.

Answer 4

Multiple smaller propellers (Distributed Propulsion)

Question 5

______ helical rotor in 1500s inspired by the bamboo-copter, was a significant step toward rotary-wing flight.

Answer 5

Leonardo da Vinci’s

Question 6

combines the efficiency of propellers with the speed of jets, blurring the line between these two types of engines.

Answer 6

Propfan technology

Question 7

Wind tunnel experiments enabled the wright bothers to achieve over ____ thrust efficiency with their propeller designs.

Answer 7

80%

Question 8

simple toys and ancient technologies provided inspiration for the development of propellers

Answer 8

Early Inspiration

Question 9

______ and ____ propellers were introduced for high-powered engines, improving thrust and efficiency

Answer 9

Contra-rotating and full-feathering (Advanced Designs)

Question 10

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

Answer 10

Turboprop engines (Turboprop Revival)

Question 11

replaced wood for increased durability and strength, improving performance and reliability.

Answer 11

Metal propellers

Question 12

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

Answer 12

Ancient China (The Bamboo-Copter: Ancient Inspiration)

Question 13

are optimized for propellers, offering clean and quiet operation for smaller aircraft.

Answer 13

Electric propulsion systems

Question 14

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

Answer 14

Jet engines

Question 15

____ and _____ propellers allowed for better control and efficiency across varying flight conditions

Answer 15

Variable pitch and constant-speed

Question 16

From ancient toys to advanced technologies, _____ have played a vital role in the history of flight.

Answer 16

Aircraft propellers

Question 17

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

Answer 17

Simple Design (The Bamboo-Copter: Ancient Inspiration)

Question 18

Leonardo’s design, while not practical at the time, highlighted the possibility of flight using spinning blades.

Answer 18

Rotary-Wing Concept (Leonardo’s Aerial Screw)

Question 19

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

Answer 19

George Cayley

Question 20

their evolution reflects humanity’s relentless pursuit of flight and our ingenuity in conquering the skies.

Answer 20

Aircraft propellers

Question 21

from ancient toys to modern aircraft, these blades have driven humanity’s journey through the skies.

Answer 21

Propellers

Question 22

The wrights’ first successful powered flight utilized airfoil-shaped wooden propellers, a significant advancement.

Answer 22

1903

Question 23

are fundamental to powered flight, converting engine rotation into forward thrust

Answer 23

Propellers (Power of Rotation)

Question 24

propellers influenced by what in the design of aircraft propellers, taking advantage of existing technology.

Answer 24

Marine Influence

Question 25

are crucial for powered flight, transforming rotational motion into thrust

Answer 25

Propellers

Question 26

A propeller with blades that can be manually adjusted to different pitch angles while on the ground, but remains fixed during flight. This allows optimization for different flight conditions without the need for complex in-flight adjustment mechanisms.

Answer 26

Ground Adjustable pitch propeller

Question 27

A propeller that can be adjusted to a negative pitch angle, directing thrust forward instead of backward. This helps reduce landing roll distance or provide reverse thrust during ground operations.

Answer 27

Reverse Pitch Propeller

Question 28

A propeller that allows the pilot to choose between two different pitch settings during flight, typically for takeoff and cruise conditions.

Answer 28

Two-position propeller

Question 29

A propeller with blades set at a single, unchangeable pitch angle, optimized for a specific flight condition (such as takeoff or cruising). It is simple and lightweight but less efficient across varying flight conditions.

Answer 29

Fixed Pitch Propeller

Question 30

A propeller that automatically adjusts its blade pitch to maintain a constant RPM regardless of changes in airspeed or power settings. This maximizes efficiency and engine performance.

Answer 30

Constant-speed propeller

Question 31

A propeller designed to rotate its blades parallel to the airflow when the engine fails or is shut down. This reduces drag and allows for smoother and more efficient gliding in twin-engine aircraft.

Answer 31

Full-Feathering Propeller

Question 32

A propeller with blades whose pitch angle can be adjusted by the pilot during flight to match varying flight requirements, improving efficiency across different phases of flight.

Answer 32

Controllable pitch propeller