Aerodynamics PDR 1 Objective To examine airfoil choices

Aerodynamics PDR #1

Objective • To examine airfoil choices • To examine wing shape choices • Structural and Manufacturing Concerns

Airfoil Selection • Manufacturability – Short building time and inexperience requires simple manufacturing • Aerodynamics – Low Cd – High L/D – High Clmax • Structure – Thin airfoil selection may not allow for sufficient structure (< 10%) • Method − Historical Data − NASG Airfoil Database

Airfoil Analysis – Selig Airfoils All data from NASG airfoil database http: //www. nasg. com

Raw Wind Tunnel Data S 1210 S 1223 ALPHA Cl Cd L^(3/2)/D Velocity ALPHA Cl Cd (L/D)^3/2 Velocity -5. 1 0. 294 0. 0203 7. 852808 38. 45585 -2. 68 0. 642 0. 04 12. 86005 26. 02367 -4. 1 0. 447 0. 0148 20. 19294 31. 18763 -1. 02 0. 961 0. 0168 56. 07584 21. 27034 -3. 05 0. 586 0. 0116 38. 67127 27. 23876 0. 48 1. 131 0. 0164 73. 34155 19. 60671 -2. 03 0. 698 0. 0116 50. 27188 24. 95792 2. 05 1. 282 0. 0187 77. 623 18. 41586 -1. 03 0. 796 0. 0126 56. 36364 23. 37112 3. 6 1. 429 0. 02 85. 41189 17. 44295 0. 02 0. 904 0. 0135 63. 66766 21. 93067 5. 1 1. 548 0. 0212 90. 84909 16. 7591 1. 005 0. 0138 73. 00793 20. 79951 6. 61 1. 671 0. 0232 93. 10579 16. 1305 2. 09 1. 116 0. 0146 80. 75017 19. 73804 8. 21 1. 8 0. 0257 93. 96706 15. 54175 3. 1 1. 217 0. 0151 88. 9117 18. 90126 9. 7 1. 91 0. 0281 93. 93852 15. 08757 4. 13 1. 316 0. 0157 96. 15773 18. 17641 11. 22 2. 016 0. 0307 93. 23896 14. 68557 5. 15 1. 409 0. 0158 105. 8545 17. 56631 12. 84 2. 116 0. 0336 91. 60817 14. 33436 6. 17 1. 493 0. 0163 111. 9186 17. 065 14. 74 2. 175 0. 0371 86. 45995 14. 1386 7. 13 1. 571 0. 0172 114. 4816 16. 63596 16. 38 2. 217 0. 0454 72. 70976 14. 00404 8. 23 1. 66 0. 0183 116. 8722 16. 18386 9. 14 1. 721 0. 0195 115. 7808 15. 89446 10. 23 1. 778 0. 0224 105. 8399 15. 6376 11. 27 1. 812 0. 0273 89. 3459 15. 4902 12. 27 1. 835 0. 0339 73. 32539 15. 39281

S 1210 Geometry

Wing Shapes • • Elliptical Twist Taper Sweep – Hard to build; unless use foam – Time consuming to build

Wing Shapes • Aspect Ratio Sizing – High AR decreases Cdi – High AR produces small chord length at given area – Small chord produces small thickness • Building concerns • Structure concerns

Wing Selection • Use a rectangular wing with no twist, taper or sweep • Easy to build • Taper, sweep, and twist effects will most likely not be worth the difficulty of manufacturing • Aspect Ratio Sizing – AR between 5 and 7 • Area about 10. 9 feet 2 – From constraints and weight of 6 lbf • Chord about 1. 5 feet – Reduced structural and manufacturing concerns • Span about 8. 0 feet – Portability as two piece wing

Vertical and Horizontal Tail • Flat Plate – Easy Manufacturing – Easy Analysis (Drag & Lift) – Easy Modeling (Controls & Feedback) – Sizing complete by Aerodynamics PDR#2