43Qw/exp-Prioritization and Delegation
A - A middle-age woman who delivers mail
B - A young adult who plays basketball regularly
C - A middle-age man with a basal metabolic rate within normal limits
D - An elderly woman who is sedentary
The airstream affected by the wing of an airplane can be considered to be a cylinder (stream tube) with a diameter equal to the wing span, b. Far downstream from the wing, the tube is deflected through an angle θ from the original direction. Use the momentum equation to the stream tube between sections 1 and 2 and find the lift of the wing as a function of b,ρ,V, and θ. Relating the lift to the lift coefficient, find θ as a function of b, CL, and wing area, S. Using the relation for induced drag, FDi=FLθ/2, show that CDi=CL2/πΛ, where Λ is the wing aspect ratio.