public static double StallAngle
        {
            get { return _stallAngle(); }
        }
        private static double _stallAngle()
        {
            double angle = zero;
            var ReNo = 5.15d * inflowVel / 1.18e-6d;

            // Low Re
            if (5000 < ReNo & ReNo < 2e6d)
                angle = (4.82 * Math.Log(ReNo) - 40.3d) * pi / hundredEighty;

            // Very low Re
            else if (ReNo < 5000)
                angle = pi / hundredEighty;

            // High Re
            else
                angle = (.837 * Math.Log(ReNo) + 18.2d) * pi / hundredEighty;

            return angle;
        }