【正文】 = Preliminary Design Review Stephen Beirne Charlie Rush Miles Hatem Zheng Wang Chris Kester Brandon Wedde Jim Radtke Greg Wilson AAE 451 Aircraft Design Final Report Team V 27 April, 2020 Team V。 2 Executive Summary The Barn Owl is Team V’s solution to the need for an alternative fuel aircraft within the single engine general aviation market. This need will arise as peakoil approaches and petroleumbased fuels bee scarce and expensive. The Barn Owl has also been designed with the nearterm need for a replacement for 100 octane lowlead aviation gasoline in mind. 100 lowlead is expected to be phased out in the next 10 years. The value of this nearterm market has been estimated at over $1 billion annually once 100 lowlead disappears. Previous work by Team V has focused on defining requirements for the Barn Owl and developing the aircraft concept. In this Preliminary Design Review, the feasibility of the Barn Owl is demonstrated by detailed analysis of the concept and its features. A weight fractionbased sizing code was used to produce constrained carpet plots. A lightweight design was selected from the feasible space, and used for further detailed design. This sizing approach was continually updated as the detailed analyses were refined. Detailed aerodynamic analysis consisted of several coordinated efforts. The airfoil crosssection was designed using a geic algorithm. The wing planform was optimized to have an elliptical lift distribution at the cruise condition. A threedimensional CMARC analysis provided detailed aerodynamic performance predictions. The team developed a structural layout and selected materials based on cost considerations. Detailed structural analysis was carried out, optimizing the wing structure and confirming the viability of the fuselage structural layout. Component weights were determined and used in calculating the static longitudinal stability of the Barn Owl. The team succeeded in demonstrating reasonable stability. Stallspin stability was also considered and assured. For propulsion, an existing diesel engine and existing propeller were selected. The use of this offtheshelf technology will reduce the cost of development and ease manufacturing. The Barn Owl is projected to cost $278,700. This price and the Barn Owl’s solid performance will make it a petitive aircraft in the general aviation market.Team V。 3 Table of Contents Introduction ................................................................................................................................... 4 Design Requirements .................................................................................................................... 5 Proposed Concept ......................................................................................................................... 6 Design Mission............................................................................................................................... 7 Sizing .............................................................................................................................................. 8 2D Aerodynamics ........................................................................................................................ 19 3D Aerodynamics ........................................................................................................................ 24 Performance ................................................................................................................................ 31 Structures..................................................................................................................................... 35 Weight and Balance amp。 Stability ................................................................................................ 50 Propulsion .................................................................................................................................... 55 Cost ............................................................................................................................................... 61 Final Design Comparisons ......................................................................................................... 72 References .................................................................................................................................... 75 Appendix A – Additional Barn Owl Pictures ........................................................................... 76 Appendix B – Sizing/Carpet Plot Code ..................................................................................... 79 Appendix C – Drag Polar Data .................................................................................................. 87 Appendix D – Wing Structure Optimization Code.................................................................. 88 Appendix E – Wing Optimization Code Outputs .................................................................... 96 Appendix F – Empty Weight Calculation Code ....................................................................... 99 Appendix G – Aluminum Equivalent Inputs for Appendix C .............................................. 101 Appendix H– Fiberglass Property Calculation Code ............................................................ 102 Appendix I – Vn Diagram Code ............................................................................................. 105 Appendix J – Flight Envelope Code ........................................................................................ 107 Team V。 4 Introduction This team’s system requirements review [14] described a plan to target the general aviation market with a singleengine, fourseat aircr