Learn Complex Topics in 20 Minutes or Less
Flight training doesn’t start in the cockpit — it starts on the ground. The more you understand before your first lesson, the faster (and cheaper) your training will be. These articles break down complex aviation topics into digestible pieces that anyone can understand.
Principles of Flight
“Thrust, drag… Weight, lift. It’s all a balancing act, revolving around the wing.”
Almost everything in aeronautics affects everything else. But the fundamentals come down to balance. In straight, level, unaccelerated flight at cruise speed: Lift equals weight and thrust equals drag. All things in life seek equilibrium — and so does an airplane.
The Four Forces
The traditional answer to “what makes an airplane fly?” is four opposing force pairs in constant equilibrium:
- Lift (up) vs. Weight (down)
- Thrust (forward) vs. Drag (backward)
We assume gravity remains constant and weight/mass is stable at any given moment. Basic aerodynamics change only with flight control inputs.
The Wing — Foundation of Lift
Every wing is built around an airfoil — a cross-sectional shape designed to generate lift. Key components:
- Leading Edge and Trailing Edge — front and back of the wing
- Camber — the curvature of the upper and lower surfaces
- Chord Line — straight line between leading and trailing edge
- Mean Camber Line — equidistant from upper and lower surfaces
Different aircraft use different airfoil designs. The Cessna 172 uses a Clark ‘Y’ airfoil. The Piper Cherokee attempted a laminar flow wing. Design varies based on aircraft weight, speed, and purpose — Piper Cub or airliner, it’s all a balancing act revolving around the wing.
How Wings Generate Lift
Two principles work together:
- Bernoulli’s Principle — as air flows over the wing, the curvature of the upper surface causes air to travel faster than air beneath the wing. Faster-moving air creates lower pressure above; slower air below maintains higher pressure. This pressure differential generates upward force.
- Newton’s Third Law — as the wing deflects air downward, the reaction is an equal and opposite force pushing the wing upward.
Together, these principles enable an aircraft to overcome gravity and remain airborne.
Topics Covered
- The four forces: lift, weight, thrust, drag
- How wings generate lift (and why it’s not just Bernoulli)
- Angle of attack and stalls
- Stability and control surfaces
- Turns, climbs, and descents
- Left turning tendencies and gyroscopic precession
- Ground effect and wingtip vortices
- Performance: climb rates, density altitude, V-speeds
The Learning Philosophy
“Repetition invokes the law of exercise.”
Learning to fly uses the same principles as learning any complex skill:
- Read about it (these articles)
- Watch someone do it (video library)
- Practice it safely (flight simulator)
- Do it for real (flight training)