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Team 5 Structures and Weights PDR #2

Team 5 Structures and Weights PDR #2. Scott Bird Mike Downes Kelby Haase Grant Hile Cyrus Sigari Sarah Umberger Jen Watson. Preview. Tail Beam Sizing Pod Support Wing And Landing Gear Attachment Fuselage Layout Parts List and Weight. Walk-around. Data Boom. Robust Wing.

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Team 5 Structures and Weights PDR #2

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  1. Team 5 Structures and Weights PDR #2 • Scott Bird • Mike Downes • Kelby Haase • Grant Hile • Cyrus Sigari • Sarah Umberger • Jen Watson PDR

  2. Preview • Tail Beam Sizing • Pod Support • Wing And Landing Gear Attachment • Fuselage Layout • Parts List and Weight PDR

  3. Walk-around Data Boom Robust Wing Tractor Engine Detachable Pod Simple Fuselage Design PDR

  4. Lrdr Lel Lrdr Lel Boom Sizing • Tail boom sizing requirements: • support the maximum loading conditions • Maximum elevator and rudder deflections • Small angle of twist • Small deflection • Assumptions and Chooses • 5g (5 times gravity) is maximum lift loading • Boom support is fixed to fuselage • Spruce PDR

  5. Maximum Loading • Maximum Lift of Rudder and Elevator • Maximum Velocity • Maximum Coefficient of Lift • Maximum deflection • Maximum Bending Moment • Longest Moment arm • Max bending at fixed end Lift x PDR

  6. Tail Boom Property Requirements • Requirement: • My = maximum bending moment • z=distance from centroid to farthest edge • σxx = ultimate yielding stress (material property) • Iy= Moment of Inertia of cross section • Requirement: θ small degree at tip in Appendix • Requirement: is small • E=Young’s Modulus (material property) • I=depends on cross section P L PDR

  7. Stress Criteria PDR

  8. Twist Criteria PDR

  9. Tip Deflection PDR

  10. y t c h x d h c t Tail Boom Cross Section Properties • Compare Cross-Sections to Minimize Weight • Two Rectangles • Box Beam • Circular PDR

  11. Pod Support • Considerations • Light Weight • Support Payload • Easily Removable • Two Supports • Aluminum Rods • Removable • Spacers • Brackets to hold Pod in place • Results=2.2lbs each • Too heavy? Spacer PDR hf

  12. Wing Attachment • Desirables • Easy to remove • Support the wing • Elastic Bands • Easy to apply and remove • Spruce Rods • Solid Skin between Attachments Wing Attachments PDR

  13. Landing Gear Attachment • Failure without disaster • Vertical • Buckle resistant • Horizontal • Fail before vertical in joint • Desired result • If Horizontal at fails joints first not much structural damage Vertical Horizontal PDR

  14. Fuselage Layout • Considerations • Support all components • Engine • Electronics • Pod • Wing • Landing Gear • Tail • Simple • Easy to build • Aerodynamic • Smooth transitions • Foam • Composite Skins • Ribs for shape PDR

  15. Part’s List • Yellow- Estimated • Blue -Program Estimated • Fuselage Weight not complete PDR

  16. Finishing Touches…. • Analysis booms support of fuselage • Pod brackets, Spacers, and Bolts • Add Solid Skin to Wing • Ailerons Attachment • Engine and other Support • Finalize Weight • Update when other values changes PDR

  17. Questions? • Questions?? PDR

  18. Material Properties ”Selection and use of Engineering Materials”, J.A. Charles PDR

  19. Wing Box Properties (Rotation Requirements) • Requirement: θ<1 degree at tip • T=Lift*(distance to shear center) • L=Half span • dis=distance between spars tf hf hr tr b PDR

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