1. Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok Structures Preliminary Design Review #1 October 12, 2000

2. Basic Layout of Wing Spar -located at the 1/4 chord Sparcaps -spruce -1/8” x 1/8” x 6.6’ Shearweb -balsa -1.5” x 1/16” x 6.6’ Ribs -balsa -spaced every 3 inches from tip -include lightening holes Added balsa at leading and trailing edge

3. Geometric Layout of rib Typical rib section

4. Geometric Layout of Wing -Stringers -None at this time -Many model planes do not have them -Would add weight -Wing covering- Monokote -Helps with twisting -Forms the skin

5. Geometric Layout of Wing Sample of strut layout from NACA report 143

6. Code Code run using preliminary size of aircraft, load factor, and a chosen spar size -Wing loading -Schrenk’s approximation (Raymer) -Shear force -Moment -Find centroids -Moments of inertia -Normal stress

7. WING LOADING Trapezoidal approximation Elliptical approximation

8. SHEAR FORCE

9. MOMENT

10. Normal STRESS

11. Material Properties Table taken from Spring ’99 AAE 451 report (Team WTA)

12. Further Testing -Test maximum shear stress of balsa using three point load test -Torsional test of wing with and without monokote

13. Structure -Fuselage - balsa -Tapered box -Modeled as truss structure -Sheet on floor to hold equipment -Horizontal/Vertical tail – balsa -Modeled as a flat plate -May have to add a spruce spar due to the size of tail

14. Landing Gear -Tail dragger configuration -Front wheels placed in front of center of gravity and to ensure propeller clearance -Spaced horizontally to avoid lateral tip over

15. Center of Gravity Estimate -Center of Gravity -Within 5-10% static margin in front of aerodynamic center -Moment Balance -Find the weight and moment arm of every component

16. Questions?