Manoeuvrin 2n grade



1. The suction of the propeller will increase the velocity of the water from v0 till v1, until the water reaches the propeller

2. Because of the increase in speed the pressure will reduce from p0 to p1

3. The propeller will pass energy to the water, the velocity has already

increased, therefore the supply of energy will effect an increase in pressure: p2

4. After the water has passed the propeller, the water pressure in the propeller wake will reduce again to the pressure of the surrounding water. p3=p0

5. As a result the velocity of the water will increase from v1 to v2. The propeller wash will contract, rotating and will cause an even spread of the water flow along the rudder surface