The experts advocate an approach to lift by Newton's laws. The experts advocate an approach to lift by Newton's laws

The experts advocate an approach to lift by Newton's laws.

• The experts advocate an approach to lift by Newton's laws.

• Any solid body that can force the air downward clearly implies that there will be an upward force on the airfoil as a Newton's 3rd law reaction force.

• From the conservation of momentum for control Volume

• The exiting air is given a downward component of momentum by the solid body, and to conserve momentum,

• something must be given an equal upward momentum to solid body.

• Only those bodies which can give downward momentum to exiting fluid can experience lift !

• Kutta-Joukowski theorem for lift.

Flow past any unknown object can be represented as a complex potential.

• Flow past any unknown object can be represented as a complex potential.

• In particular we define the complex potential

To Create IRROTATIONAL PLANE FLOWS

• To Create IRROTATIONAL PLANE FLOWS

• The uniform flow

• The source and the sink

• The vortex

source (or sink), the complex potential of which is

• source (or sink), the complex potential of which is