This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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 singleengine 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....
View Full
Document
 Fall '09

Click to edit the document details