In gliding (unpowered) flight, the lift and drag are in equilibriumwith the weight. Show that if there is no wind, theaircraft sinks at an angletan θ ≈drag/liftFor a sailplane of mass 200 kg, wing area 12 m2, and aspectratio 11, with an NACA 0009 airfoil, estimate (a) the stallspeed, (b) the minimum gliding angle, and (c) the maximumthe distance it can glide in still air when it is 1200 mabove level ground.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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In gliding (unpowered) flight, the lift and drag are in equilibrium
with the weight. Show that if there is no wind, the
aircraft sinks at an angle
tan θ ≈drag/lift
For a sailplane of mass 200 kg, wing area 12 m2, and aspect
ratio 11, with an NACA 0009 airfoil, estimate (a) the stall
speed, (b) the minimum gliding angle, and (c) the maximum
the distance it can glide in still air when it is 1200 m
above level ground.

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