Team 5 Structures and Weights QDR #1 Scott Bird Mike Downes Kelby Haase Grant Hile Cyrus Sigari Sarah Umberger Jen Watson October 16, 2003 QDR

Preview Maximum Loading Conditions Span-wise Loading Wing Box Properties October 16, 2003 QDR

Maximum Loading Conditions Assumptions only applied load is Lift no control surfaces Max Bending and Torsion is at Max Lift Max Lift at Max Velocity and Max angle of attack October 16, 2003 QDR

Maximum Velocity Intersection of Drag and Thrust At maximum Coefficient of Lift Vmax=160 ft/s October 16, 2003 QDR

Span-wise Loading Assumed Elliptical Loading Maximum at Root Max bending at root =1265 lbf/ft October 16, 2003 QDR

Wing Box Properties Assumptions and choices Front Spar Rear Spar I-beam (efficient in bending) Located at max thickness chord Supports all bending moment stress Rear Spar Rectangle Located at 60% chord Included in torsion (polar moment) Lift is at ¼ chord Aluminum Web Thickness is equal for Front and Rear Spar Skin Thickness is constant October 16, 2003 QDR

Wing Box Properties (Rotation Requirements) J=T/Gθ θ <1 deg/unit span (1.2 safety factor) Shear Modulus (G) material property Aluminum=576e6 lbf/ft^2 T=Lift*horizontal distance from centroid J=polar moment of inertia Web tw=.01 ft = .12 in Skin 1.93e-3 ft =.023 in October 16, 2003 QDR

Wing Box Properties (Bending Moment Prop) Iy=My*z/σxx My = maximum bending moment z=distance from centroid to farthest edge σxx = ultimate yielding stress (material property) Iy= Moment of Inertia of cross section October 16, 2003 QDR

Wing Box Properties Front Spar tw Rear Spar c Chosen b=.05 ft =.6in c=.125 ft and h is determined by the thickness of the airfoil Rear Spar d = .05 ft is determined by the thickness of the airfoil Iy=(b(2c)3-h3(b-tw))/12= 2.4340e-005 ft^4 Iy min =2.3379e-005 ft^4 tw c d h tw b October 16, 2003 QDR

Landing Gear Wing Ribs Different materials Weights Center of Gravity Results to come…. Landing Gear Wing Ribs Different materials Weights Center of Gravity Moments of Inertia October 16, 2003 QDR

Questions? Questions?? October 16, 2003 QDR