MEM425F10.HW5.soln

MEM425F10.HW5.soln - MEM 425: Aircraft Performance &...

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Home work #6 (due 11/04/10) solution Problem 1: Consider a wing-body model mounted in a wind tunnel. The flow conditions in the test section are sea level properties with a velocity of 100 m/sec. The wing area and chord are 1.5 m 2 and 0.45 m, respectively. The moment about the center of gravity (located at 0.285c ) when the lift is zero is measured to be -12.4 Nm. When the model is pitched to another angle of attack, the lift and the moment about the center of gravity are measured to be 3675 N and 20.67 Nm, respectively. Calculate the moment coefficient about the aerodynamic center and the location of the aerodynamic center. Solution The zero moment coefficient, when the lift is zero for a wing body model is -0.003 (longitudinally unbalanced) Location of ac w : This could be obtained from . Note; The locations are given as fractions of chord length. This yields Converting the given data to non-dimensional coefficients as above, results in . (negative static margin
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MEM425F10.HW5.soln - MEM 425: Aircraft Performance &...

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