1. The wing loading on an airplane is defined as the aircraft weight divided by the wing area. An airplane with a wing loading of 2000 N/m 2 has the aerodynamic characteristics given by Fig. 11.25....

1. The wing loading on an airplane is defined as the aircraft weight divided by the wing area. An airplane with a wing loading of 2000 N/m²
has the aerodynamic characteristics given by Fig. 11.25. Under cruise conditions the lift coefficient is 0.3. If the wing area is 10 m², find the drag force.

2. An ultra light airplane has a wing with an aspect ratio of 5 and with lift and drag coefficients corresponding to Fig. 11.24. The plan form area of the wing is 200 ft 2. The weight of the airplane and pilot is 400 lbf. The airplane flies at 50 ft /s in air with a density of 0.002 slugs/ft
³
. Find the angle of attack and the drag force on the wing.