This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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...
View Full Document
- Fall '05
- Wing, Airfoil, ξ