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MAE 3241 Hmk 1(1)

MAE 3241 Hmk 1(1) - MAE 3241 Aerodynamics and Flight...

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MAE 3241: Aerodynamics and Flight Mechanics Assigned: January 19, 2011 Homework #1 Due: January 31, 2011 Answer the following questions: 1. Estimate the Reynolds number at cruise conditions over the wing of the world’s largest commercial airplane, the Airbus A380 ( http://www.airbus.com/en/ ). Is the boundary layer laminar or turbulent? 2. Estimate the Reynolds number at the tip of the rotor blades on the Sikorsky Blackhawk helicopter ( www.sikorsky.com ) at sea-level conditions. Use a Reynolds number based on the chord of the rotor blade. 3. Explain how a helicopter flies forward. Complete the following problems from Fundamentals of Aerodynamics: 1.2, 1.3, 1.4, 1.5, 1.6, 1.9, 1.13 Answer the following question about wind tunnel testing of the Boeing 787: Boeing is interested in developing an enhanced cargo capacity version of their new 787 commercial airplane ( http://www.boeing.com/commercial/787family/index.html ). The new version will fly at a Mach number of 0.8 at an altitude of 10 km. The vehicle has a wing chord of 10 meters. A few pictures of the 787 are shown below for reference:
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