What is a Propeller? Propeller is a device used to turn torque into thrust! It consists of many tilted blades connected to a main hub. They come in many different shapes and sizes to fit their specific applications!     You can see some examples of propellers on the right!
	(L-R)https://www.flickr.com/photos/qmechanic/1382994250  https://www.obxairplanes.com/obx-airplanes-news/obx-airplanes-a-short-history-of-biplanes http://www.heartlandscience.org/aeroav/prop