Question

Problem 1 Using Excel create a graph of the following theoretical function for Lift of an airplane (Lift vs. Velocity) for 2 lift coefficients CL Create your Excel sheet so you are using absolute references for the constants. Your Velocity (x values) should range from 300 ft/s to 700 ft/s. You must choose an appropriate step size to create a smooth plot. Use good graphing practices. Where: L -Lift (lb) C Lift Coefficient (unitless), use 0.30 and 0.52 for this graph p Density of the air, we will use the density at 40,000 ft, p 0.00058735 V Velocity of the airplane (ft/s) S = Area of the wings, s = 5500 ft2 slug ft3 Problem 2 Complete the same problem as above in MATLAB. Note, you cannot just copy and paste the values in from Excel. You must create the vectors inside your MATLAB script file.

Answer 1

ANSWER:

p=0.00058735;
Cl=[0.3 0.52];
S=5500;
V=300:0.05:700;
L1=0.5*p*Cl(1)*V.^2*S;
L2=0.5*p*Cl(2)*V.^2*S;
plot(V,L1,'r');
hold on;
plot(V,L2,'b');
hold off;
legend('C_L=0.30','C_L=0.52')