At 12:33 PM 9/29/2004, you wrote: >I've just decided I don't trust the Marcy analysis. When he did it, he >assumed the section of the wing inside the fuselage was producing lift just >like the stub wings do. That means that the lift produced by the outer >wings is undercalculated and therefore the bending moment numbers he >calculated are too low.
This is a standard assumption in the wing structure analysis, but you didn't understand what he meant. The fuselage generates lift. You simply calculate the wing area that would exist if the fuselage were not there and that is the assumed total lift of the wing/fuselage combination. The bending moment on the wing is outboard of the fuselage. The total lift is applied to the wing outboard of the fuselage and will make the calculation slightly conservative. Making the fuselage wider, provided the wing panel length outboard of the fuselage, will not make the wing any weaker. It will be unaffected. It is the length outboard of the fuselage. Don Reid - donreid "at" erols.com Bumpass, Va Visit my web sites at: AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: http://www.eaa231.org/AeroFoil/index.htm KR2XL construction: http://users.erols.com/donreid/kr_page.htm Aviation Surplus: http://users.erols.com/donreid/Airparts.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA State Fly-in: http://vaeaa.org
