Aircraft Systems 1 Flashcards
What is the load per unit area of a cross-section?
Stress
What is the deformation caused by stress?
Strain
What is the maximum load the designer would expect an airframe to experience in service?
Design Limit Load
What are the two types of heating of an airframe?
Local and Kinetic
What are the 2 types of corrosion?
Chemical
Stress
What 5 factors are taken into consideration when choosing a material?
Strength Stifness Lightness Cost Ease of construction/production
What are the advantages of using composite materials over metals?
Readily engineered, designed and manufactured to complex shapes
What are the primary and secondary considerations when designing the fuselage?
Primary: accommodate the payload
Secondary: Aerodynamic
What are the three fuselage structures?
Truss
Monocoque
Semi-Monocoque
What is the function of the frames in a fuselage?
Maintain shape
improve stability of stringers
What type of bulkhead reacts to loads in tension?
Curved pressure bulkhead
What is the primary structural part of a modern fuselage?
The skin
What loads do longerons support?
Direct tension and compression
What loads do longerons support?
Direct tension and compression
Longitudinal loads due to fuselage bending
What function do stringers have?
Stabilise and reinforce the skin by accepting some of the flight loading
What are the 4 components of a wing?
Skin
Stringers
Ribs
Spars
What is an advantage of a high wing?
Ease of cargo (un)loading
What is an advantage of a mid-wing?
Small RCS / stealth
What advantages are there of a low wing?
Shorter undercarriage
Crash protection
In what direction do the tips of anhedral wings point?
Downwards
In what direction do the tips of dihedral wings point?
Upwards
Why do some aircraft have dihedral wings?
Roll stability
Why do some aircraft have dihedral wings?
Roll stability
What makes up an aircraft’s empennage?
Tailplane, fin and associated control surfaces