A Boeing 777 takes off from Denver Airport (1625 m elevation) where the pressure is 101.8 kPa. Assume that the takeoff speed is 99.4 m/s. This 777 has a takeoff weight of 2,897,229 N and its wing area is 418.9 m2. What is the minimum coefficient of lift needed at the point where
+37146 CL = L / (A * .5 * r * V2 ) L will equal the weight of the plane = 2 897 229 N
A = 418 m2
r=air density .. we need the temperature (K) of the air at 1625 m to calculate density
using STP and standard lapse rate of 2o C per 1000 ft results in 4.34o C = 277.48 K
pressure = 101.8 kPa = 101.8 x 10^3 N/m2 = 101.8 x 103 2kg/(s2-m) = 10377.17 kg/m2
using these parameters you can calc r = 1.27 kg/m3
V = 99.4 m/s
I find CL = 1.105 (not positive of this answer)
