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Unformatted text preview: Lecture F03 Mud: Thin-Airfoil Analysis Problem (continued) 1. Tough to visualize the ξ coordinate? (1 student) It’s similar to the physical x coordinate, except that the ξ coordinate is more “bunched up” at the leading edge and trailing edge. Imagine sliding along the half-circle (3rd figure in F2 notes) at a uniform speed in ξ . Your horizontal velocity in x will be very slow near the leading edge, normal in the middle, and then slow again near the trailing edge. 2. What’s the origin that ξ is measured from? The quarter-chord? (1 student) No, from the leading edge. As x runs from to c along the chord, ξ runs from to . See the 3rd figure in F2 notes. 3. What exactly is the Fourier series representing? (1 student) The function f ( ξ ) − dZ/dx . This is the angle between the freestream direction and the camberline surface. 4. What does c m,c/ 4 = lift forces dL 4 ( A 2 − A 1 ) c/ 4 − x physically mean? (1 student) The moment about the quarter-chord point can be written...
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.
- Fall '05