drive propeller

Last crawled date: 1 year, 9 months ago

a propeller is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral, that, when rotated, exerts linear thrust upon a working fluid, such as water or air. propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. the blades are specially shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by bernoulli's principle which exerts force on the fluid. most marine propellers are screw propellers with helical blades rotating on a propeller shaft with an approximately horizontal axis.