The 2D or infinite wing data at low Mach numbers for an airfoil being used on a
ID: 1819872 • Letter: T
Question
The 2D or infinite wing data at low Mach numbers for an airfoil being used on a new UAV is shown below. The actual UAV has a wingspan of 8 A. and a planform area of 6.4 ft2. The plane is designed to cruise at an altitude of 30.000 ft at a velocity of 500 ft/s. Assume theta = 1. What is the stall angle for the 2D airfoil? Is this a symmetric airfoil? What is the cruise Mach number of the UAV? Using the airfoil data, compute the lift and total drag for the actual wing at the cruise conditions and an angle of attack of 4 degree s. Assuming steady level flight for the results from part c.. what is the weight of the aircraft? Given a TSFC of 0.55 lb fuel/Ibf-hr, an overall propulsion efficiency of 0.82, and a no-fuel final weight of 250 Ibf compute the range and endurance of this aircraft assuming the initial weight corresponds to the result from c and the lift and drag results from d.Explanation / Answer
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