معامل السحب: الفرق بين النسختين

يستخدم معامل السحب في حساب [[معادلة السحب ]] حيث يعني معامل سحب صغير مقاومة للهواء أقل أو مقاومة للماء أو المائع أقل . وينطبق معامل السحب على مساحة معينة لجسم . <ref>McCormick, Barnes W. (1979): ''Aerodynamics, Aeronautics, and Flight Mechanics''. p. 24, John Wiley & Sons, Inc., New York, ISBN 0-471-03032-5</ref>

 

The drag coefficient of any object comprises the effects of the two basic contributors to [[Fluid dynamics|fluid dynamic]] drag: [[skin friction]] and [[form drag]]. The drag coefficient of a lifting [[airfoil]] or [[hydrofoil]] also includes the effects of [[lift-induced drag]].<ref>Clancy, L. J.: ''Aerodynamics''. Section 5.18</ref><ref>[[Ira H. Abbott|Abbott, Ira H.]], and Von Doenhoff, Albert E.: ''Theory of Wing Sections''. Sections 1.2 and 1.3</ref> The drag coefficient of a complete structure such as an aircraft also includes the effects of [[interference drag]].<ref>{{cite web|url=http://wright.nasa.gov/airplane/drageq.html |title=NASA’s Modern Drag Equation |publisher=Wright.nasa.gov |date=2010-03-25 |accessdate=2010-12-07}}</ref><ref>Clancy, L. J.: ''Aerodynamics''. Section 11.17</ref>

[[en:Drag coefficient ]]