In 1776, the British wizard James Watt invented the steam engine, which not only greatly promoted the first industrial revolution in human history but also created a precedent for mechanical power as marine power. It also laid the technical foundation for Britain to become a maritime hegemon. Since the propeller at that time had not yet been born, engineers limited to imagination invented the paddle wheel according to the principle of the propeller. It is a boat with oars installed on both sides of the boat. Because part of the wheel is exposed to the water, it is called a paddle steamer. But paddle steamers also have many shortcomings, such as extremely poor operability, low transmission efficiency, and so on when docking at the dock.
In 1836, the British “Archimedes” used a screw propeller, that is, a long piece of wood made like a screw. At the beginning of the test, the boat moved forward at a speed of 4 knots. Later, because the boat encountered an obstacle in the water, the screw was broken, and a small section of the screw remained, but the speed of the boat was increased to 13 knots. This little accident inspired engineers to turn the long screw into a short screw, and then turn the short screw into a blade shape, and the propeller was invented step by step through experiments. Of course, there are many interludes. For example, the shaft seal of the underwater propeller, underwater vibration, and other issues. With the advancement of human technology bit by bit, the propeller is widely used by shipyards around the world due to its great advantages.
Know the main parameters of the propeller