A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and a fluid (such as air or water) is accelerated behind the blade.
The working principle of propeller is like this: the thrust from the propeller is transmitted to move the ship through a transmission system which consists of a rotational motion generated by the main engine crank shaft, intermediate shaft and its bearings, stern tube shaft and its bearing and finally by the propeller itself.
Construction of Propeller
- Trailing edge
- Fillet area
- Hub or Boss
- Hub or Bos Cap
- Leading edge
- Propeller shaft
- Stern tube bearing
- Stern tube
Types of Propeller
Propellers are be classified on the basis of several factors. The classification of different types of propellers is shown below:
1) Classification by Number of Blades:
Propeller blades may vary from 3 blade propeller to 4 blade propeller and sometimes even 5 blade propeller. However, the most commonly used are 3 blades and 4 blade propellers.
2) Classification By pitch of the blade:
Pitch of a propeller can be defined as the displacement that a propeller makes for every full revolution of 360 ̊. The classification of the propellers on the basis of pitch is as follows.
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