Structures QDR 1 Team 2 Balsa to the

Structures QDR 1 Team 2: Balsa to the Wall Ashley Brawner Matt Negilski Neelam Datta Mike Palumbo Xing Huang Chris Selby Jesse Jones Tara Trafton 1

Overview n n Geometric layout of wing structure Material properties Analysis of wing loads CG estimate 2

Wing Structure Geometry 3

Material Properties Table E-Glass Fiber S-Glass Fiber E-glass (Fabric) Balsa Wood Carbon Fiber Polyurethane Foam Density (lbs/in^3) 0. 071 0. 072 0. 068 0. 054 0. 065 0. 0046 Tensile Strength (ksi) 165 250 62. 8 0. 16 325 0. 16 Shear Strength (ksi) 12. 9 10 12. 2 0. 54 10. 6 0. 2 6 6. 5 3. 55 0. 0094 21. 3 0. 0051 Transverse Young's Modulus (10^6 psi) 1. 5 1. 6 3. 45 0. 0094 1. 5 0. 0051 Shear Modulus (10^6 psi) 0. 62 0. 66 0. 68 0. 0085 1 0. 00145 Poisson's Ratio 0. 28 0. 29 0. 11 0. 4 0. 27 0. 25 Longitudinal Young's Modulus (10^6 psi) 4

Load Factor – Max Lift 5

Load Factor – Level Turn 6

Load Factor – Vertical Turn 7

Wing Centroid 8

Bending Analysis 9

Twisting Analysis • T = Torque • Cm = Moment Coefficient • c = Chord length • q = shear flow • A_bar = Airfoil cross-sectional area • theta = twist angle/unit length 10

Twisting Analysis 11

Load Analysis 12

CG Approximation 13

CG Approximation BALSA Component weight (lb) x pos (in. ) y pos (in. ) Structure 2. 26 15. 04 0. 81 Speed Controller 0. 26 6. 00 1. 34 Batteries 1. 25 2. 00 1. 34 Motor 0. 59 5. 00 1. 34 Payload 1. 00 3. 00 -0. 50 Gyro 0. 01 3. 50 1. 75 Tail Servos 0. 08 7. 50 0. 54 Receiver 0. 04 3. 50 1. 00 Total Weight 5. 50 CG 8. 15 0. 77 Aerodynamic Center 9. 26 1. 34 14

Questions? 15