MEM425F10.HW5

MEM425F10.HW5 - calculate the moment about the center of...

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Home work #5 (due 11/04/10) 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. Problem 2: Consider the model in Problem 1. If a mass of lead is added to the model so that the center of gravity is shifted rearward by a length equal to 20% of the chord,
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Unformatted text preview: calculate the moment about the center of gravity when the lift is 4000 N. Problem 3: Consider the model in Problem 1. Assume that a horizontal tail with no elevator is added to this model with the incidence angle i t = 0). The distance from the models center of gravity to the tails aerodynamic center is 1.0m. The tail area is 0.4 m 2 . The lift-curve slope of the tail is 0.12 per degree. From experimental measurements = 0 , and . If the absolute angle of attack of the model is 5 o , and the lift is 4134 N, calculate the moment about the center of gravity. Does this model have longitudinal static stability and balance? Determine the trim angle of attack for this configuration. Relevance to Program Outcomes a-k : a, e, k...
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MEM425F10.HW5 - calculate the moment about the center of...

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