Lesson 14: Lift and Drag in Aerodynamics

The difference between lift and drag in easy words




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Click here for the previous lessons, to learn about: Principle of Airframe; Principles of Aerodynamics; Airfoil Characteristics; Primary Flight Control Surfaces; Description and Operation of Helicopter; Miscellaneous Components of an Aircraft…

Lift and drag are aerodynamic forces that depend on the shape and size of the aircraft, air conditions, and the flight velocity. Lift is directed perpendicular to the flight path and drag is directed along the flight path.

**Key points

What is the concept of lift?
What is the difference between lift and drag?
Why does lift increase drag?
What is drag and lift principle?
What is the relationship between lift and drag force?

 

 

 

What is the concept of lift?

 

Lift is a mechanical force. It is generated by the interaction and contact of a solid body with a fluid (liquid or gas). It is not generated by a force field, in the sense of a gravitational field,or an electromagnetic field, where one object can affect another object without being in physical contact.

 

What is the difference between lift and drag?

difference between lift and drag


Lift is defined as the component of the aerodynamic force that is perpendicular to the flow direction, and drag is the component that is parallel to the flow direction.

An elliptical planform is the most efficient aerodynamic shape for an untwisted wing, leading to the lowest amount of induced drag.

What is the relationship between lift and drag force?

The lift and drag forces are the direct result of the relationship between the relative wind and the aircraft. The lift force always acts perpendicular to the relative wind and the drag force always acts parallel and in the same direction as the relative wind.

 

Lift and Drag in Aerodynamics

Why does lift increase drag?

Induced Drag is an inevitable consequence of lift and is produced by the passage of an aerofoil (e.g. wing or tailplane) through the air. Air flowing over the top of a wing tends to flow inwards because the decreased pressure over the top surface is less than the pressure outside the wing tip.

What is drag and lift principle?

Drag is given a positive sign, when it pulls in the same direction as the stream. Drag is a loss that must be overcome with another force, if an object is to move against a stream. A force perpendicular to the stream is called lift. A moment around this axis is called a yaw moment.


Increasing the thickness will increase the lift
. Increasing the area will increase the lift. Increasing the altitude will decrease the lift.

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