3 questions on what you just watched.
Answer or skip — either way, continue when ready.
1. Why are lightweight structures essential for flight?
Most of an airplane's structure is empty space: a Van's RV-14 weighs only ~590 kg — less than many cars. The lighter the structure, the less lift is needed to sustain flight.
2. How does an airfoil generate lift?
The airfoil's curved upper surface makes air accelerate and reduce pressure, while the flatter lower surface slows air and raises pressure — this pressure difference generates lift, designed to maximise lift and minimise drag.
3. An airplane flying at 100 mph generates a certain amount of lift. If it accelerates to 200 mph, what happens to the lift?
Lift increases with the square of velocity: doubling speed from 100 to 200 mph multiplies lift by four (and by 16 at 400 mph) — the same law you feel putting your hand out of a car window.
THINK & DISCUSS
If lift scales with speed squared, why don't all aircraft just fly faster — what is the catch?
No single right answer — form your own view and defend it.
