You would be forgiven for thinking that lift always acts straight up. It is often expressed using the wing’s chord line as a reference. The center of pressure describes the sum of these different amounts. As a result, they generate different amounts of lift. Wings aren’t entirely equal and change in shape from the root to the tip. Lift acts through the center of pressure and at 90° to the relative airflow. It is mostly generated by the wings, but smaller elements of lift are generated by the horizontal stabilizer and even the fuselage. Lift is vital to ensuring sustained flight. Okay, so it’s a little obvious, but the lift is a good place to start as we are talking airplanes. Vector Direction: 90° to the relative airflow Vector Acts Through: The Center of Pressure Here are the four forces involved in the principle of flight, their effects, and how they work. Understanding resultant forces make it easy to determine what will happen to the aircraft. The easy answer is that no principle of flight exists in isolation. Why do we need to know about resultant forces? If you increase any vector, the resultant force will grow. Two vectors at 90 degrees to each other form two sides of a right-angle triangle. Resultant forces are the combination of two vectors. That’s it! Vectors can combine to produce resultant forces.
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