Chapter 6

6.2 The four main forces

There are various forces that acts on an aircraft, all of which are related to physical phenomena and determine whether an aircraft can ascend, descend or fly at a constant altitude.

The main forces are:

  • Lift;
  • Weight;
  • Thrust;
  • Drag.

With regard to the interplay between the four main forces, the following principles apply:

  • For an aircraft to take to the skies, its lift must be greater than its weight.
  • To stay in the air, its lift must be at least equal to its weight.
  1. The Venturi-effect
  2. Bernoulli's Law


    See chapter 6.11 for a summary

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