MEM425F09.HW6 - calculate the moment about the center of...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Peter Carrion MEM 425 11/5/2009 MEM 425: Aircraft Performance & Design Home work #6 (due 11/05/09) 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,
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

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 model’s center of gravity to the tail’s 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 0.42 . 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? Relevance to Program Outcomes a-k : a, e, k Peter Carrion MEM 425 11/5/2009...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern