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Unformatted text preview: AA311 Homework 5. Due November 14, 2011 Give all your answers in SI units. Problem 1. An aircraft weighs 12 , 500 N and has a 20 m 2 wing area, an aspect ratio of 6 and efficiency factor e = 0 . 9. If C D = 0 . 02, (a) Calculate the values of the minimum drag force D min and the airspeed for minimum drag V md at standard sea level conditions. (b) Assuming a constant sea level thrust T SL = 5000 N, find the maximum speed V max and minimum speed V min at sea level. (c) Calculate the airspeed for minimum power V mp at standard sea level conditions and the value of minimum power required P req , min . Problem 2. A single-engine light aircraft has the following properties: AR = 6 . 5, S = 200ft 2 , e = 0 . 85, W = 2500lb, and C D = 0 . 025. The engine can produce P shaft , max = 375 hp at sea level. The propeller efficiency is = 0 . 85. (a) Use Matlab to plot the power required curve at sea level, in ISA conditions. Indicate the (constant) power available on the plot. Use your plot to determine the maximum velocity....
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- Fall '09