Question: In gliding (unpowered) flight, lift and drag are in equilibrium with the weight. Show, that with no wind, the craft sinks at an angle tan

In gliding (unpowered) flight, lift and drag are in equilibrium with the weight. Show, that with no wind, the craft sinks at an angle tanθ ≈ drag/lift. For a sailplane with m = 200 kg, wing area = 12 m2, AR = 12, with an NACA 0009 airfoil, estimate (a) stall speed, (b) minimum gliding angle; (c) the maximum distance it can glide in still air at z = 1200 m.

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