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Raven SAR Rotorcraft Advanced Rotor Control Concept

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Raven SAR Rotorcraft Advanced Rotor Control Concept Raven SAR Rotorcraft Advanced Rotor Control Concept Alfred Gessow Rotorcraft Center Department of Aerospace Engineering University of Maryland, College Park Maryland, 20742 University of Maryland Alfred Gessow Rotorcraft Center Department of Aerospace Engineering University of Maryland, College Park Maryland, 20742 Raven SAR Rotorcraft In response to the 2001 Annual AHS International Student Design Competition – Graduate Category 21 June 2001 Matthew Tarascio – Team Leader Dr. Inderjit Chopra – Faculty Advisor Marc Gervais Gaurav Gopalan Tim Gowen Kristi Kleinhesselink Jun Ma Kiran Singh Yong-sheng Zhao Acknowledgements The Terp Works design team would like to thank all of the people that assisted us during the 2001 AHS design competition. First and foremost, we would like to express our sincerest thanks to the faculty members that graciously offered their support throughout the entire project, including Dr. Marat Tishchenko, Dr. Alfred Gessow, Dr. V. T. Nagaraj, and Dr. Inderjit Chopra. We would also like to thank our fellow students who offered us their support, particularly Taeoh Lee, Jayanarayanan Sitaraman and Harsha Prahlad. And finally, we would like to send a special thanks to the SAR operators who took the time to respond to our questions, including Philip Hogan (Senior Helicopter Paramedic – Victorian Air Ambulance), Chris Snyder (Director of Coast Guard and Federal Programs – Agusta Westland), Daniel Tyler (SAR/EMS Senior Pilot – Care Flight Services), Lieutenant Strumm (Pilot – NAS Patuxent River SAR), Lieutenant Gancayco (Pilot – NAS Patuxent River SAR), AMHC Robert Mirabal (Crew Chief – NAS Patuxent River SAR), AT1 Jason Van Buren (Rescue Swimmer – NAS Patuxent River SAR), and HM2 Jason Owen (Medical Technician – NAS Patuxent River SAR). 2001 AHS Design Proposal Page i Table of Contents ACKNOWLEDGEMENTS ................................................................................................................................................................... I TABLE OF CONTENTS ...................................................................................................................................................................... II EXECUTIVE SUMMARY ................................................................................................................................................................. VI SECTION 1 – INTRODUCTION .......................................................................................................................................................... 1 SECTION 2 – SAR MISSION RESPONSIVENESS ............................................................................................................................. 1 2.1 – DESIGN PHILOSOPHY ....................................................................................................................................................................................1 2.2 – SAR MISSION STUDY ....................................................................................................................................................................................1 2.2.1 – General SAR Mission Requirements ...................................................................................................................................................................... 2 2.2.2 – Mission Profile (RFP Defined) .............................................................................................................................................................................. 2 2.2.3 – Mission Launch Requirements ............................................................................................................................................................................... 2 2.2.4 – Mission Constraints ................................................................................................................................................................................................ 3 2.2.5 – SAR Operator Suggestions ..................................................................................................................................................................................... 4 2.3 – SAR DESIGN DRIVERS ..................................................................................................................................................................................5 SECTION 3 – CONFIGURATION DESIGN AND DEVELOPMENT ................................................................................................. 6 3.1 – DESIGN METHODOLOGY ...............................................................................................................................................................................6 3.2 – INITIAL CONCEPT SELECTION .......................................................................................................................................................................6 3.2.1 – Candidate Configurations ...................................................................................................................................................................................... 6 3.2.2 – Evaluation Criteria ................................................................................................................................................................................................. 6 3.2.3 – Weighting Factors ................................................................................................................................................................................................... 6 3.2.4 – Concept Evaluation ................................................................................................................................................................................................. 7 3.2.5 – Preliminary Concept Assessment ........................................................................................................................................................................... 7 3.3 – CONFIGURATION TRADE STUDIES ................................................................................................................................................................7 3.3.1 – Historical Database ................................................................................................................................................................................................ 7 3.3.2 – Mission Profile ........................................................................................................................................................................................................ 8 3.3.3 – Methodology ............................................................................................................................................................................................................ 8 3.3.4 – Analysis Limitations ................................................................................................................................................................................................ 9 3.3.5 – Design Parameters & Code Validation ................................................................................................................................................................. 9 3.3.6 – Measures of Effectiveness / Efficiency ................................................................................................................................................................. 10 3.3.7 – Trade Study Results............................................................................................................................................................................................... 11 3.4 – FINAL CONFIGURATION SELECTION ........................................................................................................................................................... 14 SECTION 4 – RAVEN DESIGN FEATURES AND PERFORMANCE SUMMARY ........................................................................ 16 SECTION 5 – MAIN ROTOR AND HUB DESIGN............................................................................................................................ 17 5.1 – BASELINE ROTOR DESIGN .......................................................................................................................................................................... 17 5.1.1 – Diameter ................................................................................................................................................................................................................ 17 5.1.2 – Tip Speed and Tip Shape ...................................................................................................................................................................................... 17 5.1.3 – Solidity ................................................................................................................................................................................................................... 17 5.1.4 – Twist and Taper..................................................................................................................................................................................................... 18 5.1.5 – Number of Blades .................................................................................................................................................................................................
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