Aeromodelling

Lift is the major force that keeps an aeroplane floating in the air. Lift produced by the wing moving through the air. Bernoulli’s law explains the lift, or upward forces that how the airfoils generate lift through the air flow.

The pressure of a fluid (liquid or gas) decreases at points where the speed of the fluid flow increases. In other words, Bernoulli discovered that within the same fluid, high speed flow is associated with low pressure, and low speed flow with high pressure. This principle was first used to explain changes in the pressure of fluid flowing within a pipe whose cross-sectional area varied.

About diagram show the pressure changes at difference sections of the pipe. The pipe cross section constructed gradually from wide to narrow than to wide. This “necked-down” section called a venturi. The fluid travels at low speed with high pressure at wide section. As the fluid moves toward the narrow section, the fluid flow is increased and the pressure reduced. The result of the pressure at the venturi section lower than the two ends of the pipe. This phenomenon is an important application for the aircraft wing to generate lift.