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 == Citing sources == 

 Thank you for your contributions to Flight dynamics.  I notice that none of your contributions have shown a source for your information.  Wikipedia is an encyclopedia rather than a series of essays.  The information in any encyclopedia, but especially Wikipedia, is always taken from authoritative and reliable sources, and those sources should be identifiable. 

 Wikipedia has a policy of always identifying suitable sources to allow information to be independently verified.  This requires editors to use references and in-line citations to show a suitable source for the information they have added.  Please see WP:Citing sources for more information on this subject.  Thank you for your understanding.   '''' "