Chapter 1, Problem 1.15P

Consider a light, single-engine, propeller-driven airplane similar to a Cessna Skylanc. The airplane weight is 2950 lb and the wing reference area is . The drag coefficient of the airplane isa function of the lift coefficient for reasons that are given in Chapter 5; this function for the given airplane is .

a. For a steady level flight at sea level, where the ambient atmospheric density is . plot on a graph the variation of , , and the lift-to-drag ratio LID with flight velocity ranging between 70 ft/s and 250 ft/s.

b. Make some observations about the variation of these quantities with velocity.