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Buoyancy and resistance on the wing profile

The following animation illustrates the principle of dynamic buoyancy.

Note: You can enlarge or reduce the four sections by using your mouse.

The animation was originally developed as a offline application for Windows and Macintosh systems and for integration into Microsoft PowerPoint slides. The online version presented here serve as a preview. The exe or app file can be downloaded free of charge from members area.

Download Windows

Download Macintosh


The animation contains four segments with the following content:

Top leftA wing profile (Clark-Y) showing the buoyancy, resistance and total force. In addition, it depicts the force of the weight.
Top rightDiagram showing the buoyancy and resistance coefficient in dependency to the setting angle.
Bottom leftFormulas for the calculation of the buoyancy and resistance force
Bottom rightPolar diagram as a representation of the buoyancy coefficient in dependency to the resistance coefficient.

The animation demonstrates that even with a flat angle of 0 degrees a high buoyancy still occurs. This fact cannot be explained mechanically (Bernoulli Principle).

The animation is based on measured values that have been determined in a wind tunnel with a Clark-Y profile (see source information). Actually is the resistance smaller than in the animation. To illustrate the resistance better and make it more apparent, it was multiplied by a factor of 10.

General information

Title:Buoyancy and resistance on the wing profile
Target group:
  • Teachers and lecturers
  • Independent learners
Platforms (primary):
  • Microsoft® Windows®
  • Apple® Macintosh®
  • Resizable without the loss of visual clarity
  • No installation required
DocumentsLicensing Information


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