Definition
A section heading in aerodynamics texts that introduces the two complementary scientific explanations used to describe how a wing generates lift: Bernoulli's principle (which explains lift in terms of pressure differences caused by changes in airflow speed over and under the wing) and Newton's third law (which explains lift in terms of the wing deflecting air downward, producing an equal and opposite upward reaction). Both theories describe the same physical phenomenon from different viewpoints, and both are needed for a complete understanding of how lift is produced.
Plain English
The different scientific ways of explaining why a wing lifts an aircraft into the air. There is more than one correct explanation, and pilots learn both because each one shows a different part of the same picture.
Context Anchor
Seen in the aerodynamics chapter when learning why an airplane can fly, especially before studying wing shape, angle of attack, air pressure, and airflow.
Derivation
‘Theory’ comes from the Greek theoria, meaning ‘a way of looking at something.’ In science it does not mean a guess — it means a tested explanation of how something works. ‘Production of lift’ simply means ‘how lift is made.’ So the heading is really saying: ‘the tested explanations of how a wing makes lift.’
Why Pilots Care
Knowing these theories helps pilots understand why airfoil shape, angle of attack, and airspeed affect lift and flight safety.
Analogy
A wing is not like a balloon that simply floats upward. It is more like a shaped tool moving through air, changing how the air moves so that a lifting force is created.
Grounding Statement
Picture the wing moving forward through the air: air flows over and under it, the wing changes that flow, and the changed flow produces lift.
Intuition Check
Do not read “theories” as “unproven guesses.” In this context, theories are practical explanations used to understand and predict lift. Do not read “production” as manufacturing. Here it means how lift is created.
Example Sentence 1
Before studying airfoil shapes in detail, the student reviewed the theories in the production of lift so she could see how Bernoulli and Newton each contributed to the explanation.
Example Sentence 2
During preflight study the instructor explained Theories in the Production of Lift using the wing’s curved shape.