Multiple choice

An aircraft is flying in level flight at a speed of 200 km/hr through air (density, $\rho$= 1.2 kg/m2, and viscosity m = 1.6 x 10-5 N-s/m2). The lift co-efficient at this speed is 0.4 and the drag co-efficient is 0.0065. The mass of the aircraft is 800 kg. The effective lift area of the aircraft is

  1. 21.2 m2

  2. 10.6 m2

  3. 2.2 m2

  4. 1.1 m2
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B Correct answer
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