Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

# Lift and Drag

## Body - like an airfoil - in fluid flow

### Lifting Force

The lifting force acting on a body in a fluid flow can be calculated

FLcL 1/2 ρ v2 A                                        (1)

where

FL = lifting force (N)

cL = lifting coefficient

ρ = density of fluid (kg/m3)

v = flow velocity (m/s)

A = body area (m2)

### Drag Force

The drag force acting on a body in fluid flow can be calculated

FD = cD 1/2 ρ v2 A                                     (2)

where

FD = drag force (N)

cD = drag coefficient

ρ = density of fluid (kg/m3)

v = flow velocity (m/s)

A = body area (m2)

### Required Thrust Power to overcome Drag Force

The thrust power required to overcome the drag force can be calculated

P = FD v                                       (3)

where

P = power (W)

### Example - Aeroplane and Airfoil Lift - Drag and required Thrust Power

For an aeroplane with velocity 100 m/s, wing area 20 m2, a drag coefficient 0.06 and a lift coefficient 0.7 - the lifting force acting on the airfoil can be calculated

FL = 0.7 1/2 (1.2 kg/m3) (100 m/s)2 (20 m2)

= 84000 (N)

= 84 (kN)

The drag force can be calculated

FD = 0.06  1/2 (1.2 kg/m3) (100 m/s)2 (20 m2)

= 7200 (N)

= 7.2 (kN)

Required thrust power to overcome the drag force:

P = (7200 N) (100 m/s)

= 720000 (W)

= 720 (kW)

## Related Topics

• Fluid Mechanics - The study of fluids - liquids and gases. Involves velocity, pressure, density and temperature as functions of space and time

## Tag Search

• en: lift drag fluid flow thrust weight power wing body
• es: el flujo de fluido telesquí peso empuje cuerpo ala potencia
• de: Aufzug Drag Flüssigkeitsströmung gestoßen Gewichtskraft Wing Body

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

## Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

## Citation

• Engineering ToolBox, (2010). Lift and Drag. [online] Available at: https://www.engineeringtoolbox.com/lift-drag-fluid-flow-d_1657.html [Accessed Day Mo. Year].

Modify access date.

. .

#### Scientific Online Calculator 8 27