Giorgino, the value for density at standard sea level is not 1225 kg/m cubed, but 1.225 kg/m cubed. Using L = W = 588600 Newtons, and the formula L = .5 * rho * S * Cl * V squared, the value for V comes out as 154.4 meters/sec. This converts to 300 nm/hour.
Hawk