We want to show you the arrangement of a boat propeller which can change its angle of attack.
That's the boat which propeller we are going to assemble.
The propeller consists of a body with cylindrical slots to hold the blades.
Inside the body there is the so called heart of the propeller. It has three grooves for the blades to turn. It is fastened to a push rod which in its turn goes through the propeller. The transmission features a special device which pushes the rod thus turning the blades.
The body's cover, the view on the inside. It also has cylindrical slots which hold the blades.
This is one of the blades of the propeller. It is rather heavy with a weight of close to 100 kg. By the way, it is relatively small. Costa Concordia for example has blades which are six times as big.