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solution5 - 650:460 Aerodynamics Homework Assignment No. 5...

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Unformatted text preview: 650:460 Aerodynamics Homework Assignment No. 5 Prof. Doyle Knight Tel: 732 445 4464, Email: doyleknight@gmail.com Office hours: Tues and Thur, 4:30 pm - 6:00 pm and by appointment Fall 2009 1 Problem 7.1 Consider an airplane that weighs 14,700 N and cruises in level flight at 300 km/hr at an altitude of 3 km. The wing has a surface area of 17 m 2 and an aspect ratio of 6.2. Assume that the lift coefficient is a linear function of the angle of attack and that o , l =- 1 . 2 . If the load distribution is elliptic, calculate the value of the circulation in the plane of symmetry o , the downwash velocity w ( y 1 ), the induced drag coefficient C D v , the geometric angle of attack and the effective angle of attack e . Solution The velocity of the airplane is U = 83 . 33 m/s. At 3 km altitude, the density is = 0 . 9092 kg/m 3 . Thus, the dynamic pressure is q = 1 2 U 2 = 3156 . 9 Pa 2 Problem 7.1 Since the aspect ratio AR = 6 . 2, b = AR S = 10...
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solution5 - 650:460 Aerodynamics Homework Assignment No. 5...

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