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1284173
le mindmap~
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What principles affect aerofoils to produce lift, and why are there differing opinions on which principle is correct?
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hye.kwon
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le mindmap~
What is Lift?
Lift is the force that holds an airplane in the air
A mechanical force
One of the four forces affecting things that fly
Where are Aerofoils present?
Helicopter blades
Turbo machinery
Wings
Space shuttles
Passenger jets
Jumbo jets
Military aircraft
Fighter jets
Cargo aircraft
Recreational aircraft
Hang gliders
Gliders
Hydrofoils
Sails
Racing cars
Wind turbines
Nature
Wings
Birds
Insects
Plants
Seeds
Sea animals
Flippers
Sessile organisms
Bodies of fish
How is Lift generated?
A fluid flowing past the surface of a body, exerting force
When a moving flow of gas turns an object
Air flow is deflected down, and the wing is pushed up
Low pressure on the upper surface of a wing and high pressure on the bottom
Air speeds up when the pressure is lower and vice versa
The pressure and speed difference results in lift
Forces of Flight
Lift
Drag
Weight
Thrust
What are some Principles or Theories that explain Lift
Coanda effect
Bernoulli's principle
Newton's 3rd law
Equal transit theory
Action - Reaction theory
Kutta-Joukowski theorem
Venturi theory
What is an Aerofoil?
Cross section of a wing or blade
A body that produces lift when moving through a fluid
Physical attributes
Rounded leading edge
Forward edge
Sharp trailing edge
Aft edge
Camber line
Denotes the amount of curvature of the wing
Point of maximum thickness
Thickest part of the aerofoil
Expressed as a percentage of the chord
Chord
Imaginary straight line connecting the leading and trailing edge
Angle of attack
Angle between the aerofoil and oncoming air
Larger angles result in more lift
Exceeding a critical angle of attack (approx 15 degrees) causes stalling
Stall is a sudden reduction of lift
Symmetric aerofoils
Aerofoils with no camber
Also called an Airfoil
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