Propeller basics
Propeller: Basics By Kobus Kotze / Indian Ocean Skippers Training. Here are just a few basics. There are a variety of different propellers. There are propellers with two, three or four blades. There are also propellers that turn clockwise or anti-clockwise when moving forward. A propeller works by converting torque (a force that causes it to rotate) into thrust (forward movement). A turning propeller moves water downwards and behind the blades, in other words an action which produces a thrust of water from the...