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Message: <blockquote data-quote="LovernotaFighter" data-source="post: 1703907" data-attributes="member: 231367">If you remember physics class, MV = MV.  So the mass of air X the speed of air being pushed  = mass of the airplane X the speed of the airplane.So since air is very light, you have to push a lot of air and in very high speed.  It is very difficult to find FAN that can blow that much air.===I used to take flight lesson.  When a plane is ready to take off, I could be 10 cars away, and I can feel a huge wind blow (almost enough to off balance me as I'm walking).  That is a lot of moving air.Good Luck...</blockquote>