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← All subjects · Aerodynamics

Aerodynamics Beginner

00  Fundamentals of Lift

In steady level flight four forces balance: lift carries the weight, thrust covers the drag. This lesson is about the first of those, and about clearing out the most popular wrong explanation of it before it takes root.

Lift Weight Thrust Drag Steady level flight: lift balances weight, thrust balances drag
Step 2 / 2

A friend explains lift like this: "Air over the top must travel a longer path in the same time as air underneath, so it moves faster, and by Bernoulli faster means lower pressure." Name exactly what is wrong in that chain, what Bernoulli legitimately contributes, and why the story cannot explain a plane flying upside down.

Hints
  • The weak link is the phrase "in the same time". Ask: what law enforces that?
  • Bernoulli is not the error. The premise feeding it is.
  • Inverted flight puts the "longer path" on the bottom. What must the pilot change so the wing still lifts?
Calculations are checked exactly; written answers are graded by Claude.