16 Questions
What percentage of a modern full-loaded subsonic transport's total weight is payload when taking off?
20%
Why is the use of light materials important in aircraft design?
To reduce structural weight and increase payload
What does the aircraft manufacturer's heavy investment in weight reduction primarily indicate?
The importance of saving in aircraft weight
What type of materials do airframe designers demand for aircraft structural design?
Strong, stiff materials at an acceptable weight and cost
For what purpose do significant parts of the airframe emphasize stability considerations?
Buckling and therefore a high elastic modulus
What is the percentage of the remaining 80% of the full-loaded subsonic transport's total weight, after considering the payload, that is attributed to aircraft empty weight?
~40%
What is the expected life in hours for military fighters?
6000-8000 hours
Which material is having a major effect on aircraft design?
Composite materials
What type of materials are thermoplastic composites?
Materials that can be rendered malleable by heat
What are the principal materials in airframe design?
Aluminum, steel, and titanium
Which material has improved properties based on its lower density?
Aluminum-lithium
What are the expected weight savings with the use of composite materials?
20 - 30%
What does tension and compression coupon tests provide fundamental information on?
Material mechanical properties
What is the major effect of weight savings in aircraft design?
Greater payload for a given take-off weight
What properties does the designer require data on prior to material selection?
Time-dependent properties, fatigue crack propagation, fracture toughness, creep data, and resistance to corrosion
Which materials will probably continue to be the principal materials in airframe design for a while?
Aluminum, steel, and titanium
Test your knowledge about airframe structural design, materials, and weight considerations in aircraft structures with this quiz. Explore the developments from wood to modern high-strength materials and their application in aviation.
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