Assembling A Boat Propeller

Assembling A Boat Propeller

We want to show you the arrangement of a boat propeller which can change its angle of attack.

Assembling A Boat Propeller

That’s the boat which propeller we are going to assemble.

Assembling A Boat Propeller

The propeller consists of a body with cylindrical slots to hold the blades.

Assembling A Boat Propeller

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.

Assembling A Boat Propeller

The body’s cover, the view on the inside. It also has cylindrical slots which hold the blades.

Assembling A Boat Propeller

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.

Assembling A Boat Propeller

The blades are installed into the grooves of the propeller’s body. As you see, the blade has grooves too. Also, it has a pin with a block on which slips in the slot of the propeller’s heart when the blades are turning.

All that is made of brass, by the way.

Assembling A Boat Propeller

One of the blocks. Each block is numbered according to its blade.

Assembling A Boat Propeller

This is how it looks when assembled (we put a thick layer of lubricant on it).

Assembling A Boat Propeller

It is difficult to install the first two blades and the construction looks like a puzzle. Besides, the bigger the propeller, the more difficult it is to work with it.

Assembling A Boat Propeller

The third blade has been installed.

Assembling A Boat Propeller

After the propeller has been assembled, you have to pump some thick lubricant into it. It is made with a special high pressure pump with a pneumatic actuator.

Into this propeller, we have pumped about 18 kg of the lubricant. As soon as you see it coming from every crack, turn the pump off!

Thank you for your attention.

3 thoughts on “Assembling A Boat Propeller”

  1. These things are neat. With the right kind of variable pitch prop you can reverse the ship without having to change the direction of the engines’ rotation. I have worked with such systems on tug boats and they make engine rooms a lot simpler and sturdier by simplifying the transmissions and reduction gear.

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