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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects was mounted via a plywood wing joiner and aluminum spar (as in the actual plane) to a 2”x4”x30” piece of hardwood and glued into place. The hardwood mount was then bolted to a large sheet of plywood and weights were applied to the large plywood sheet such that the wing hangs off of an overhang. A top view of the constructed test wing with the mounting apparatus is shown in Figure 114 and a root view is provided within Figure 115. Figure 114: Test Wing with Mounting Apparatus Top View Figure 115: Test Wing with Mounting Apparatus Root View The whiffle tree was designed using the lift function derived from the AVL lift distribution plot. The lift distribution function is seen in Equation 35. Using the ratio of lift loads at specified span 134
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects locations, the required whiffle tree configuration was designed as seen in Figure 116, where ∆ corresponds to a distance of 5 inches. () = −0.001 + 0.0215 + 0.807 Equation 35: Estimated Wing Loading Function Figure 116: Whiffle Tree Final Design The results from the test were then compared to a predicted max tip displacement of 0.62 inches at 3 g loading, and with a COSMOSWorks FEM model prediction of 0.69 inch max tip displacement. The COSMOSWorks FEM model and loading analysis are shown in Figure 117. Figure 117: COSMOSWorks FEM Model of Tip Displacement The whiffle tree then distributed a single load applied on the bottom rung to model the actual lift curve along the wing. The whiffle tree system was composed of multiple straps and metal beams placed onto the wing and taped into place to avoid slippage during testing. Weight was applied in 5 lb increments to the bottom rung of the whiffle tree to a loading of 3 g’s (22.5 lbs), which the wing was designed to withstand. The deflection at this point was then measured by using a ruler to measure the difference between the wing tip and an above the wing beam reference. This beam reference was a spar mounted above the wing onto the 2”x4” board where 135
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University of Colorado Design/Build
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