Follow Orionrobots on Facebook for updates and feedback Tag machine 29 May 2005 » Propeller A spinning blade propulsion system used in air and water travel. The blades are angled so they push the medium(that is the air or water - both referred to also as fluids in this context) in a direction continuously.more... 14 Nov 2004 » SubMarine Any underwater vesical is said to be a submarine vesical.more...