WorldofAerospace.googlepages.com Contact Us | Sitemap | Home Calculate Moment about the Quarter-Chord Point Per Unit Span  Method to Calculate the Moment about the Quarter Chord point per Unit Span with Constant Chord Placed in Low-Speed Wind Tunnel Aerospace Moment about Quarter Chord Point of Constant Chord Wing In order to calculate the moment about the quarter chord point per unit span of a constant chord wing placed in a low-speed wind tunnel. We must first have the value of the Wing Chord length (c) in meters.   We must also have the Flow velocity in the test section in meter/second.   The Angle of Attack of the Airfoil and the Lift Coefficient corresponding to that given AOA.   Also, the Value of the Moment Coefficient about the quarter-chord point is also required for the given angle of attack.   The value of meu = 1.789e-5 kg/ms is taken. The value of the Reynold's Number is entered. Performing the calculation gives, Moment about the quarter-chord point per unit span. The formula used for Moment is M, c/4 = qSCm,c/4c q = Dynamic Pressure, S = Wing Area, c= Chord, M= Moment.   Download Free Program to Calculate the Moment about the Quarter-chord point per Unit Span 