# Confusion about calculation of aerodynamic moments

• Nikhil05
In summary, aerodynamic moment is a rotational force caused by the movement of air over an object's surface, resulting in rotation around the center of pressure. Pitching moment affects up and down movement, while rolling moment affects side to side movement. It is calculated by multiplying the aerodynamic force by the moment arm and is affected by factors such as object shape, angle of attack, air density, and speed. Accurate calculation of aerodynamic moments is important in the design and analysis of objects that move through air for improved performance and safety.
Nikhil05
Hello,

Can anybody explain how the aerodynamic moment is calculated for an airfoil ?
I was reading the first chapter in "Fundamentals of Aerodynamics" by Anderson & the formula for aerodynamic moment for the lower surface of the airfoil confused me. Is the aerodynamic moment calculated about some other point for the lower surface ?
Thank you.

no need now, i figured it out myself. was just interpreting it wrongly.

## What is aerodynamic moment?

Aerodynamic moment is a force that acts on an object due to the movement of air over its surface. It is a rotational force that causes an object to rotate around a certain point, known as the center of pressure.

## What is the difference between pitching moment and rolling moment?

Pitching moment is a rotational force that causes an object to rotate around its lateral axis, while rolling moment is a rotational force that causes an object to rotate around its longitudinal axis. In simpler terms, pitching moment affects an object's up and down movement, while rolling moment affects its side to side movement.

## How is aerodynamic moment calculated?

Aerodynamic moment is calculated by multiplying the aerodynamic force acting on an object by the distance from the center of pressure to the point where the force is acting. This distance is known as the moment arm. The result is a vector quantity with both magnitude and direction.

## What factors affect the calculation of aerodynamic moments?

The calculation of aerodynamic moments is affected by a number of factors, including the shape and size of the object, its angle of attack, air density, and the speed of the object. Additionally, the location of the center of pressure can also have a significant impact on the calculation.

## Why is it important to accurately calculate aerodynamic moments?

Accurate calculation of aerodynamic moments is crucial in the design and analysis of aircraft and other objects that move through the air. It helps engineers understand how an object will behave under different conditions and allows for the optimization of the object's design for improved performance and safety.

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