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The 2014 Cessna Aircraft Company/Raytheon Missile

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The 2014 Cessna Aircraft Company/Raytheon Missile The 2014 Cessna Aircraft Company/Raytheon Missile Systems/AIAA Design/Build/Fly Competition Flyoff was held at Cessna East Field in Wichita, KS on the weekend of April 11-13, 2014. This was the 18th year the competition was held. Of the 100 entries this year, a total of 80 teams submitted written reports to be judged. And 71 teams attended the flyoff (19 international). All the teams that attended completed the technical inspection. Approximately 700 students, faculty, and guests were present. The theme for this year was a “Back Country Rough Field Bush Plane”: Taxi Mission simulated rough field operations using corrugated roofing panels Flight mission 1 was a ferry flight scored on the number of laps which could be flown in 4 minutes Flight mission 2 was a maximum load mission with team-chosen number of cargo blocks for three laps Flight mission 3 was an emergency medical mission carrying two simulated patients and attendants on a timed three-lap flight. The Mission Score was the sum of the three Flight Scores, and factored by the Taxi Score (1 if completed, 0.2 if not). As usual, the Final Score is the product of the Mission Score and written Report Score, divided by airplane RAC (empty weight). More details can be found at the competition website: http://www.aiaadbf.org Despite strong winds for most of the weekend and a 1-hour suspension on Sunday for a passing thunderstorm, the flyoff set new records. There were 209 flight attempts, of which 105 resulted in a valid flight score. 49 teams had successful flight scores and 61 completed the taxi mission. 20 teams completed all three flight missions. The quality of the teams, readiness to compete, and execution of the flights was outstanding. First place went to University of Southern California with a score of 407.24, second place to University of California Irvine at 352.86 and third to San Jose State University at 326.37. A full listing of the results is shown below. The best paper award, sponsored by the Design Engineering TC for the highest report score, went to Cal Poly San Luis Obispo with a score of 98.70. We owe our thanks for the success of the DBF competition to the efforts of many volunteers from Cessna Aircraft, the Raytheon Missile Systems, and the AIAA sponsoring technical committees (Applied Aerodynamics, Aircraft Design, Flight Test, and Design Engineering). These volunteers collectively set the rules for the contest, publicize the event, gather entries, judge the written reports, and organize the flyoff. Thanks also go to the Corporate Sponsors: Cessna Aircraft, Raytheon Missile Systems, and the AIAA Foundation for their financial support. Special thanks to Cessna Aircraft for hosting the flyoff this year. Finally, this event would not be nearly as successful without the hard work and enthusiasm from all the students and advisors. If it weren’t for you, we wouldn’t keep doing it. David Levy For the DBF Governing Committee CAL POLY California Polytechnic State University, San Luis Obispo 2013-2014 AIAA Design/Build/Fly Report AIAA Design/Build/Fly 2013/2014 Contents 1 Executive Summary 3 1.1 Design Summary . 3 1.2 Mission Requirements . 3 1.3 System Performance . 4 2 Management Summary 4 2.1 Team Organization . 4 2.2 Hierarchical Chart . 4 2.3 Milestone/Gantt Chart . 5 3 Conceptual Design 6 3.1 Mission Requirements . 6 3.1.1 Mission and Scoring Summary . 6 3.1.2 Scoring Sensitivities Analysis . 8 3.1.3 Design Constraints . 9 3.2 Mission to Design Requirements . 10 3.3 Solutions Considered, Selection Process, and Results . 10 3.3.1 Initial Concepts . 10 3.3.2 High Wing Conventional . 11 3.3.3 Low Wing Conventional . 11 3.3.4 Landing Gear Configurations . 11 3.3.5 Tail Configurations . 12 3.3.6 Payload Configurations . 13 3.3.7 Selection Validation . 14 4 Preliminary Design 15 4.1 Design Methodology . 16 4.1.1 Iterative Design Process . 16 4.1.2 Rapid Prototyping . 16 4.2 Sizing and Trade Studies . 16 4.2.1 Tail Sizing . 16 4.3 Mission Model . 18 4.3.1 Model Analysis . 18 4.3.2 System Uncertainties . 18 4.4 Aircraft Characteristics . 19 4.4.1 Airfoil Selection . 19 4.4.2 Drag Build Up . 22 4.4.3 Stability and Control . 25 4.4.4 Structural Design . 28 4.4.5 Propulsion Design . 30 4.5 Preliminary Mission Performance . 32 5 Detail Design 33 California Polytechnic State University, San Luis Obispo 1 AIAA Design/Build/Fly 2013/2014 5.1 Dimensions and Parameters . 34 5.2 Structural Characteristics . 34 5.3 Subsystems Design . 37 5.3.1 Servo Selection . 37 5.3.2 Electronic Speed Controller Selection . 38 5.3.3 Receiver Selection . 38 5.4 Weight and Balance . 39 5.5 Performance Parameters . 40 5.5.1 Flight Performance . 40 5.5.2 Mission Performance . 41 5.6 Drawing Package . 41 6 Manufacturing Plan and Processes 47 6.1 Manufacturing Process and Techniques . 47 6.1.1 Balsa Build-Up . 47 6.1.2 Composites . 47 6.1.3 Foam . 47 6.2 Wing Construction . 47 6.3 Backbone Construction . 48 6.4 Fuselage Construction . 48 6.5 Milestone Chart . 48 7 Testing Plan 49 7.1 Testing Schedule . 49 7.2 Flight Testing . 49 7.3 Taxi Testing . 51 7.4 Tests Performed . 52 7.4.1 Wing Structural Testing . 52 7.4.2 Backbone Structural Testing . 53 7.4.3 Propulsion Testing . 54 7.4.4 Other Component Testing . 55 8 Performance Results 55 8.1 Subsystem Performance . 55 8.1.1 Propulsion System . 55 8.1.2 Structures . 56 8.1.3 Aerodynamics . 57 8.2 Aircraft Flight Performance . 57 California Polytechnic State University, San Luis Obispo 2 AIAA Design/Build/Fly 2013/2014 1 Executive Summary This report details the design process used by California Polytechnic State University, San Luis Obispo to compete in the 2013/2014 AIAA Design/Build/Fly competition. The goal of the competition was to design an aircraft that best meets the mission requirements and maximizes the scoring equations. This year’s competition required a light, fast aircraft capable of carrying six inch cubes and two 9x4x2 inch blocks accompanied by two 4x2x6 inch blocks simulating a medical evacuation. The final design was created through extensive analysis, testing, and hard work by a completely volunteer student team at Cal Poly. 1.1 Design Summary The goal of the design process was to create the highest possible scoring aircraft while satisfying all of the requirements. Due to many different performance parameters greatly affecting each other, the most important factors needed to be identified. To isolate the most important parameters, a sensitivities analysis was performed on the total score equation. This analysis revealed that empty takeoff weight and speed were the two most important factors, weight being about twice as important as speed. As a result, most design decisions were driven by weight minimization, and a weight increase for speed was only acceptable if the percent speed gain was twice the percent weight gain. 1.2 Mission Requirements There are a total of four missions that must be completed.
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