Development of a Helicopter Vortex Ring State Warning System Through a Moving Map Display Computer

Total Page:16

File Type:pdf, Size:1020Kb

Development of a Helicopter Vortex Ring State Warning System Through a Moving Map Display Computer Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection 1999-09 Development of a helicopter vortex ring state warning system through a moving map display computer Varnes, David J. Monterey, California. Naval Postgraduate School http://hdl.handle.net/10945/26475 DUDLEY KNOX LIBRARY NAVAL POSTGRADUATE SCHOOL MONTEREY CA 93943-5101 NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS DEVELOPMENT OF A HELICOPTER VORTEX RING STATE WARNING SYSTEM THROUGH A MOVING MAP DISPLAY COMPUTER by David J. Varnes September 1999 Thesis Advisor: Russell W. Duren Approved for public release; distribution is unlimited. Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington. VA 22202-4302, and to the Office of Management and Budget. Paperwork Reduction Project (0704-0188) Washington DC 20503. REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED 1. agency use only (Leave blank) September 1999 Master's Thesis 4. TITLE AND SUBTITLE 5. FUNDING NUMBERS DEVELOPMENT OF A HELICOPTER VORTEX RING STATE WARNING SYSTEM THROUGH A MOVING MAP DISPLAY COMPUTER 6. AUTHOR(S) Varnes, David, J. 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) PERFORMING ORGANIZATION Naval Postgraduate School REPORT NUMBER Monterey, CA 93943-5000 10. SPONSORING/MONITORING AGENCY 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) REPORT NUMBER Office of Naval Research (Naval Science Advisory Program) Mr. CNAL-1.2-99-TSP Steve Kern, Science and Technology Advisor, Commander, Naval Air Force, U.S. Atlantic Fleet, 1279 Franklin St., Norfolk, VA 23511- 2494 11. SUPPLEMENTARY NOTES The views expressed in this thesis are those of the author and do not reflect the official policy or position of the Department of Defense or the U.S. Government. 12a. DISTRIBUTION / AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE Approved for public release; distribution is unlimited. ABSTRACT The need for improved pilot aids has become a high priority item for pilots and aircrews operating at sea and ashore. Pilot aids such as the moving map display, GPWS, collision, and vortex-ring state (VRS) warning systems will significantly enhance aircrew situational awareness and safety. Many more of today's aircraft mishaps are a result of pilot error, which includes a loss of situational awareness. The moving map display provides relatively easy incorporation of sophisticated pilot aids without operational flight program (OFP) modification. This thesis discusses, examines and selects a vortex-ring state prediction algorithm to be incorporated in the GADGHT unit. A program was written that manipulated required aircraft performance data from the ARINC 429 data bus and compared this data to vortex-ring state boundaries predicted by the algorithm. The GADGHT unit provides an audible and visual warning to the pilots when the aircraft has penetrated the VRS boundaries. This warning system will provide increased safety and situational awareness to helicopter crews operating in increasingly demanding operational environments. 14. SUBJECT TERMS 15. NUMBER OF PAGES Vortex Ring State, Power Settling, Settling With Power, Pilot Aids, GADGHT, 153 Ground Air Display for Geographical/Hydrographical Tracking 16. PRICE CODE 17. SECURITY 1. SECURITY 19. SECURITY 20. LIMITATION OF CLASSIFICATION OF ABSTRACT REPORT CLASSIFICATION OF CLASSIFICATION OF THIS PAGE ABSTRACT Unclassified Unclassified Unclassified UL NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std 239-18 11 HUDLEY KNOX LIBRARY ^^POSTGRADUATE SCHOOL 943~5101 Approved for public release; distribution is unlimited. DEVELOPMENT OF A HELICOPTER VORTEX RING STATE WARNING SYSTEM THROUGH A MOVING MAP DISPLAY COMPUTER David J. Varnes Lieutenant Commander, United States Navy B.S., Purdue University, 1989 Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN AERONAUTICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL September 1999 Y ; A DUDLEY KNOX LIBRAE NAVAL POSTGRADUATE SO* MONTEREY CA tfi ABSTRACT The need for improved pilot aids has become a high priority item for pilots and aircrews operating at sea and ashore. Pilot aids such as the moving map display, GPWS, collision, and vortex-ring state (VRS) warning systems will significantly enhance aircrew situational awareness and safety. Many more of today's aircraft mishaps are a result of pilot error, which includes a loss of situational awareness. The moving map display provides relatively easy incorporation of sophisticated pilot aids without operational flight program (OFP) modification. This thesis discusses, examines and selects a vortex-ring state prediction algorithm to be incorporated in the GADGHT unit. A program was written that manipulated required aircraft performance data from the ARINC 429 data bus and compared this data to vortex-ring state boundaries predicted by the algorithm. The GADGHT unit provides an audible and visual warning to the pilots when the aircraft has penetrated the VRS boundaries. This warning system will provide increased safety and situational awareness to helicopter crews operating in increasingly demanding operational environments. VI TABLE OF CONTENTS I. INTRODUCTION 1 A. PURPOSE 1 B. TERMINOLOGY 1 C. RESEARCH CONTRIBUTION 3 D. ORGANIZATION OF THESIS 4 H. THE GADGHT SYSTEM AND PILOT AIDS 5 A. GADGHT SYSTEM 5 1. Atlas Unit 6 2. Mercury Unit 7 3. Gemini Unit 7 '. 4. Apollo Unit 8 B. FALCONVIEW AND OTHER FLIGHT PLANNING SOFTWARE 10 HI. VORTEX-RING STATE THEORY 13 A. EARLY STUDIES 13 1. Helicopter Behavior in the Vortex-Ring Conditions 13 a. Propeller-Working State 13 b. Vortex-Ring State 14 c. The Windmill-Brake State 14 2. Observations 14 a. Sikorsky R-4B 15 b. Sikorsky R-6 16 c. Sikorsky S-51 16 d. Bell 47 16 e. Bristol 171 17 3. Stewart's Conclusions and Discussion 17 B. SAFETY DATA 18 C. SAFETY IMPLICATIONS 22 vn 1 D. MOMENTUM THEORY AND THE VORTEX-RING STATE 26 1. Momentum Theory In A Hover. 30 2. Momentum Theory In Climbing And Descending Flight 3 3. The Vortex-Ring State..... 32 a. Vortex-Ring State Characteristics 33 4. Autorotation And The Turbulent Wake State 38 5. Windmill Brake State 39 IV. VORTEX-RING STATE BOUNDARY PREDICTION ALGORITHMS 41 A. ALGORITHMS REVIEWED 41 1. Wolkovitch 41 a. Upper Boundary 42 b. Experimental Comparison 45 c. Inclined Descents 46 d. Vortex-Ring State Lower Boundary 46 e. Predicted Vortex-Ring State Boundary 48 2. Peters And Chen 48 a. Background 49 b. Upper And Lower Boundary 52 c. Concluding Remarks 57 3. Gao And Xin 58 a. Experimental Set Up 58 b. Testing And Reduction Of Data 61 c. Results 63 B. EXPERIMENTAL COMPARISONS WITH H-34 DATA 70 C. ALGORITHM CRITIQUE AND SELECTION 76 1. Wolkovitch 77 2. Peters And Chen 79 3. Gao and Xin 80 D. OTHER VORTEX-RING STATE INDICATORS 82 1. Yeates' Vibration Study........ 82 viii 1 a. Results 85 2. H-34 Flight Test Data 88 3. Conclusion 96 V. IMPLEMENTATION 99 A. ALGORITHM DEVELOPMENT 99 1. MATLAB Coding 99 B. IMPLEMENTATION ON THE GADGHT UNIT 101 C. IMPLEMENTATION CONSIDERATIONS 107 1. Ease of Integration into Helicopter Avionics System 107 2. Low Airspeed Sensing 107 3. False Alarm Rates and Missed Warning Concerns 109 4. Validation and Flight Testing 109 VI. CONCLUSIONS AND RECOMMENDATIONS FOR FURTHER STUDY 1 1 APPENDIX A. WARNING SYSTEM PROGRAMMING CODE 115 A. MATLAB PROGRAMMING CODE 115 B. C++ PROGRAMMING CODE 116 APPENDIX B. SOFTWARE SCREEN CAPTURES 123 A. AIRCRAFT AVIONICS SYSTEM 123 B. VORTEX-RING STATE MONITOR START UP WINDOW 124 C. VORTEX-RING STATE MONITOR WARNING 125 D. VORTEX-RING STATE MONITOR WARNING BACKGROUND FLASHING 126 E. SIMULATION SETUP 127 F. PC-104 127 G. KNEEBOARD 128 LIST OF REFERENCES 129 INITIAL DISTRIBUTION LIST 133 ix LIST OF FIGURES Figure 1. GADGHT Atlas Unit From Ref. [5] 6 Figure 2. GADGHT Thor Unit From Ref. [5] 6 Figure 3. GADGHT Mercury Unit from Ref. [5] 7 Figure 4. GADGHT Gemini Unit From Ref. [5] 8 Figure 5. GADGHT Apollo Unit From Ref. [5] 8 Figure 6. Stewart's Airflow Conditions For A Typical Helicopter From Ref. [8] 15 Figure 1 . Typical Flight Envelope From Ref. [1 1] 25 Figure 8. Vortex-Ring State boundary Overlaid On A Climb Performance Chart After Ref. [12] 26 Figure 9. Helicopter Flow States From Ref. [13] 27 Figure 10. Flow Field Condition At The Rotor From Ref. [13] 28 Figure 11. Thrust Variation In Vortex-Ring State From Ref. [13] 34 Figure 12. Power Settling Region Of Vortex-Ring State From Ref. [13] 35 Figure 13. Vortex-Ring State Airbody Formation From Ref. [13] 37 Figure 14. Rotor Row - Ideal Autorotation And Turbulent Wake State From Ref. [14] 39 Figure 15. Wolkovitch's Flow Model From Ref. [15] 42 Figure 16. Induced Velocity Versus Rate Of Descent From Ref. [15] 43 xi Figure 17. Upper Boundary Of Vortex-Ring State From Ref. [15] 44 Figure 18. Drag And Airspeed Relationship From Ref. [1] 45 Figure 19. Measured Thrust Fluctuations - Vertical Descent From Ref. [15] 46 Figure 20. Flow Model For The Lower Vortex-Ring State Boundary From Ref. [15] 47 Figure 21. Predicted Vortex-Ring State Boundary From Ref. [15] 48 Figure 22. Velocity Components, Actual And Normalized From Ref. [16] 50 Figure 23. Induced Flow Versus Rate Of Descent For Various \x Values From Ref [16] 51 Figure 24. Region In Which Momentum Equation Has Three Roots From Ref. [16] 52 Figure 25. Wake Propogation Flow Model From Ref. [16] 53 Figure 26. Vortex-Ring State Boundary From Ref.
Recommended publications
  • Jay Carter, Founder &
    CARTER AVIATION TECHNOLOGIES An Aerospace Research & Development Company Jay Carter, Founder & CEO CAFE Electric Aircraft Symposium www.CarterCopters.com July 23rd, 2017 Wichita©2015 CARTER AVIATIONFalls, TECHNOLOGIES,Texas LLC SR/C is a trademark of Carter Aviation Technologies, LLC1 A History of Innovation Built first gyros while still in college with father’s guidance Led to job with Bell Research & Development Steam car built by Jay and his father First car to meet original 1977 emission standards Could make a cold startup & then drive away in less than 30 seconds Founded Carter Wind Energy in 1976 Installed wind turbines from Hawaii to United Kingdom to 300 miles north of the Arctic Circle One of only two U.S. manufacturers to survive the mid ‘80s industry decline ©2015 CARTER AVIATION TECHNOLOGIES, LLC 2 SR/C™ Technology Progression 2013-2014 DARPA TERN Won contract over 5 majors 2009 License Agreement with AAI, Multiple Military Concepts 2011 2017 2nd Gen First Flight Find a Manufacturing Later Demonstrated Partner and Begin 2005 L/D of 12+ Commercial Development 1998 1 st Gen 1st Gen L/D of 7.0 First flight 1994 - 1997 Analysis & Component Testing 22 years, 22 patents + 5 pending 1994 Company 11 key technical challenges overcome founded Proven technology with real flight test ©2015 CARTER AVIATION TECHNOLOGIES, LLC 3 SR/C™ Technology Progression Quiet Jump Takeoff & Flyover at 600 ft agl Video also available on YouTube: https://www.youtube.com/watch?v=_VxOC7xtfRM ©2015 CARTER AVIATION TECHNOLOGIES, LLC 4 SR/C vs. Fixed Wing • SR/C rotor very low drag by being slowed Profile HP vs.
    [Show full text]
  • NASA Mars Helicopter Team Striving for a “Kitty Hawk” Moment
    NASA Mars Helicopter Team Striving for a “Kitty Hawk” Moment NASA’s next Mars exploration ground vehicle, Mars 2020 Rover, will carry along what could become the first aircraft to fly on another planet. By Richard Whittle he world altitude record for a helicopter was set on June 12, 1972, when Aérospatiale chief test pilot Jean Boulet coaxed T his company’s first SA 315 Lama to a hair-raising 12,442 m (40,820 ft) above sea level at Aérodrome d’Istres, northwest of Marseille, France. Roughly a year from now, NASA hopes to fly an electric helicopter at altitudes equivalent to two and a half times Boulet’s enduring record. But NASA’s small, unmanned machine actually will fly only about five meters above the surface where it is to take off and land — the planet Mars. Members of NASA’s Mars Helicopter team prepare the flight model (the actual vehicle going to Mars) for a test in the JPL The NASA Mars Helicopter is to make a seven-month trip to its Space Simulator on Jan. 18, 2019. (NASA photo) destination folded up and attached to the underbelly of the Mars 2020 Rover, “Perseverance,” a 10-foot-long (3 m), 9-foot-wide (2.7 The atmosphere of Mars — 95% carbon dioxide — is about one m), 7-foot-tall (2.13 m), 2,260-lb (1,025-kg) ground exploration percent as dense as the atmosphere of Earth. That makes flying at vehicle. The Rover is scheduled for launch from Cape Canaveral five meters on Mars “equal to about 100,000 feet [30,480 m] above this July on a United Launch Alliance Atlas V rocket and targeted sea level here on Earth,” noted Balaram.
    [Show full text]
  • Design, Modelling and Control of a Space UAV for Mars Exploration
    Design, Modelling and Control of a Space UAV for Mars Exploration Akash Patel Space Engineering, master's level (120 credits) 2021 Luleå University of Technology Department of Computer Science, Electrical and Space Engineering Design, Modelling and Control of a Space UAV for Mars Exploration Akash Patel Department of Computer Science, Electrical and Space Engineering Faculty of Space Science and Technology Luleå University of Technology Submitted in partial satisfaction of the requirements for the Degree of Masters in Space Science and Technology Supervisor Dr George Nikolakopoulos January 2021 Acknowledgements I would like to take this opportunity to thank my thesis supervisor Dr. George Nikolakopoulos who has laid a concrete foundation for me to learn and apply the concepts of robotics and automation for this project. I would be forever grateful to George Nikolakopoulos for believing in me and for supporting me in making this master thesis a success through tough times. I am thankful to him for putting me in loop with different personnel from the robotics group of LTU to get guidance on various topics. I would like to thank Christoforos Kanellakis for guiding me in the control part of this thesis. I would also like to thank Björn Lindquist for providing me with additional research material and for explaining low level and high level controllers for UAV. I am grateful to have been a part of the robotics group at Luleå University of Technology and I thank the members of the robotics group for their time, support and considerations for my master thesis. I would also like to thank Professor Lars-Göran Westerberg from LTU for his guidance in develop- ment of fluid simulations for this master thesis project.
    [Show full text]
  • Real-Time Helicopter Flight Control: Modelling and Control by Linearization and Neural Networks
    Purdue University Purdue e-Pubs Department of Electrical and Computer Department of Electrical and Computer Engineering Technical Reports Engineering August 1991 Real-Time Helicopter Flight Control: Modelling and Control by Linearization and Neural Networks Tobias J. Pallett Purdue University School of Electrical Engineering Shaheen Ahmad Purdue University School of Electrical Engineering Follow this and additional works at: https://docs.lib.purdue.edu/ecetr Pallett, Tobias J. and Ahmad, Shaheen, "Real-Time Helicopter Flight Control: Modelling and Control by Linearization and Neural Networks" (1991). Department of Electrical and Computer Engineering Technical Reports. Paper 317. https://docs.lib.purdue.edu/ecetr/317 This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact [email protected] for additional information. Real-Time Helicopter Flight Control: Modelling and Control by Linearization and Neural Networks Tobias J. Pallett Shaheen Ahmad TR-EE 91-35 August 1991 Real-Time Helicopter Flight Control: Modelling and Control by Lineal-ization and Neural Networks Tobias J. Pallett and Shaheen Ahmad Real-Time Robot Control Laboratory, School of Electrical Engineering, Purdue University West Lafayette, IN 47907 USA ABSTRACT In this report we determine the dynamic model of a miniature helicopter in hovering flight. Identification procedures for the nonlinear terms are also described. The model is then used to design several linearized control laws and a neural network controller. The controllers were then flight tested on a miniature helicopter flight control test bed the details of which are also presented in this report. Experimental performance of the linearized and neural network controllers are discussed.
    [Show full text]
  • Helicopter Dynamics Concerning Retreating Blade Stall on a Coaxial Helicopter
    Helicopter Dynamics Concerning Retreating Blade Stall on a Coaxial Helicopter A project presented to The Faculty of the Department of Aerospace Engineering San José State University In partial fulfillment of the requirements for the degree Master of Science in Aerospace Engineering by Aaron Ford May 2019 approved by Prof. Jeanine Hunter Faculty Advisor © 2019 Aaron Ford ALL RIGHTS RESERVED ABSTRACT Helicopter Dynamics Concerning Retreating Blade Stall on a Coaxial Helicopter by Aaron Ford A model of helicopter blade flapping dynamics is created to determine the occurrence of retreating blade stall on a coaxial helicopter with pusher-propeller in straight and level flight. Equations of motion are developed, and blade element theory is utilized to evaluate the appropriate aerodynamics. Modelling of the blade flapping behavior is verified against benchmark data and then used to determine the angle of attack distribution about the rotor disk for standard helicopter configurations utilizing both hinged and hingeless rotor blades. Modelling of the coaxial configuration with the pusher-prop in straight and level flight is then considered. An approach was taken that minimizes the angle of attack and generation of lift on the advancing side while minimizing them on the retreating side of the rotor disk. The resulting asymmetric lift distribution is compensated for by using both counter-rotating rotor disks to maximize lift on their respective advancing sides and reduce drag on their respective retreating sides. The result is an elimination of retreating blade stall in the coaxial and pusher-propeller configuration. Finally, an assessment of the lift capability of the configuration at both sea level and at “high and hot” conditions were made.
    [Show full text]
  • Adventures in Low Disk Loading VTOL Design
    NASA/TP—2018–219981 Adventures in Low Disk Loading VTOL Design Mike Scully Ames Research Center Moffett Field, California Click here: Press F1 key (Windows) or Help key (Mac) for help September 2018 This page is required and contains approved text that cannot be changed. NASA STI Program ... in Profile Since its founding, NASA has been dedicated • CONFERENCE PUBLICATION. to the advancement of aeronautics and space Collected papers from scientific and science. The NASA scientific and technical technical conferences, symposia, seminars, information (STI) program plays a key part in or other meetings sponsored or co- helping NASA maintain this important role. sponsored by NASA. The NASA STI program operates under the • SPECIAL PUBLICATION. Scientific, auspices of the Agency Chief Information technical, or historical information from Officer. It collects, organizes, provides for NASA programs, projects, and missions, archiving, and disseminates NASA’s STI. The often concerned with subjects having NASA STI program provides access to the NTRS substantial public interest. Registered and its public interface, the NASA Technical Reports Server, thus providing one of • TECHNICAL TRANSLATION. the largest collections of aeronautical and space English-language translations of foreign science STI in the world. Results are published in scientific and technical material pertinent to both non-NASA channels and by NASA in the NASA’s mission. NASA STI Report Series, which includes the following report types: Specialized services also include organizing and publishing research results, distributing • TECHNICAL PUBLICATION. Reports of specialized research announcements and feeds, completed research or a major significant providing information desk and personal search phase of research that present the results of support, and enabling data exchange services.
    [Show full text]
  • Micro Coaxial Helicopter Controller Design
    Micro Coaxial Helicopter Controller Design A Thesis Submitted to the Faculty of Drexel University by Zelimir Husnic in partial fulfillment of the requirements for the degree of Doctor of Philosophy December 2014 c Copyright 2014 Zelimir Husnic. All Rights Reserved. ii Dedications To my parents and family. iii Acknowledgments There are many people who need to be acknowledged for their involvement in this research and their support for many years. I would like to dedicate my thankfulness to Dr. Bor-Chin Chang, without whom this work would not have started. As an excellent academic advisor, he has always been a helpful and inspiring mentor. Dr. B. C. Chang provided me with guidance and direction. Special thanks goes to Dr. Mishah Salman and Dr. Humayun Kabir for their mentorship and help. I would like to convey thanks to my entire thesis committee: Dr. Chang, Dr. Kwatny, Dr. Yousuff, Dr. Zhou and Dr. Kabir. Above all, I express my sincere thanks to my family for their unconditional love and support. iv v Table of Contents List of Tables ........................................... viii List of Figures .......................................... ix Abstract .............................................. xiii 1. Introduction .......................................... 1 1.1 Vehicles to be Discussed................................... 1 1.2 Coaxial Benefits ....................................... 2 1.3 Motivation .......................................... 3 2. Helicopter Flight Dynamics ................................ 4 2.1 Introduction ........................................
    [Show full text]
  • Over Thirty Years After the Wright Brothers
    ver thirty years after the Wright Brothers absolutely right in terms of a so-called “pure” helicop- attained powered, heavier-than-air, fixed-wing ter. However, the quest for speed in rotary-wing flight Oflight in the United States, Germany astounded drove designers to consider another option: the com- the world in 1936 with demonstrations of the vertical pound helicopter. flight capabilities of the side-by-side rotor Focke Fw 61, The definition of a “compound helicopter” is open to which eclipsed all previous attempts at controlled verti- debate (see sidebar). Although many contend that aug- cal flight. However, even its overall performance was mented forward propulsion is all that is necessary to modest, particularly with regards to forward speed. Even place a helicopter in the “compound” category, others after Igor Sikorsky perfected the now-classic configura- insist that it need only possess some form of augment- tion of a large single main rotor and a smaller anti- ed lift, or that it must have both. Focusing on what torque tail rotor a few years later, speed was still limited could be called “propulsive compounds,” the following in comparison to that of the helicopter’s fixed-wing pages provide a broad overview of the different helicop- brethren. Although Sikorsky’s basic design withstood ters that have been flown over the years with some sort the test of time and became the dominant helicopter of auxiliary propulsion unit: one or more propellers or configuration worldwide (approximately 95% today), jet engines. This survey also gives a brief look at the all helicopters currently in service suffer from one pri- ways in which different manufacturers have chosen to mary limitation: the inability to achieve forward speeds approach the problem of increased forward speed while much greater than 200 kt (230 mph).
    [Show full text]
  • Rotor Spring 2018
    Departments Features Index of Advertisers Spring 2018 rotor.org Serving the International BY THE INDUSTRY Helicopter Community FOR THE INDUSTRY Grand Canyon Helitack The Best Job in Aviation? What’s In Your Jet Fuel? p 58 Vietnam Pilots and Crew Members Honored p 28 Make the Connection March 4–7, 2019 • Atlanta Georgia World Congress Center Exhibits Open March 5–7 Apply for exhibit space at heliexpo.rotor.org LOTTERY 1* Open to HAI HELI-EXPO 2018 Exhibitors APPLY BY June 22, 2018 WITH PAYMENT LOTTERY 2 Open to All Companies APPLY BY Aug. 10, 2018 WITH PAYMENT heliexpo.rotor.org * For information on how to upgrade within Lottery 1, contact [email protected]. EXHIBIT NOW FALCON CREST AVIATION PROUDLY SUPPLIES & MAINTAINS AVIATION’S BEST SEALED LEAD ACID BATTERY RG-380E/44 RG-355 RG-214 RG-222 RG-390E RG-427 RG-407 RG-206 Bell Long Ranger Bell 212, 412, 412EP Bell 407 RG-222 (17 Ah) or RG-224 (24 Ah) RG-380E/44 (42 Ah) RG-407A1 (27 Ah) Falcon Crest STC No. SR09069RC Falcon Crest STC No. SR09053RC Falcon Crest STC No. SR09359RC Airbus Helicopters Bell 222U Airbus Helicopters AS355 E, F, F1, F2, N RG-380E/44 (42 Ah) BK 117, A-1, A-3, A-4, B-1, B-2, C-1 RG-355 (17 Ah) Falcon Crest STC No. SR09142RC RG-390E (28 Ah) Falcon Crest STC No. SR09186RC Falcon Crest STC No. SR09034RC Sikorsky S-76 A, C, C+ Airbus Helicopters RG-380E/44 (42 Ah) Airbus Helicopters AS350B, B1, B2, BA, C, D, D1 Falcon Crest STC No.
    [Show full text]
  • Helicopter Safety July-August 1991
    F L I G H T S A F E T Y F O U N D A T I O N HELICOPTER SAFETY Vol. 17 No. 4 For Everyone Concerned with the Safety of Flight July/August 1991 The Philosophy and Realities of Autorotations Like the power-off glide in a fixed-wing aircraft, the autorotation in a helicopter must be used properly if it is to be a successful safety maneuver. by Michael K. Hynes Aviation Consultant In all helicopter flying, there is no single event that has a In the early years of airplane flight, the fear of engine greater impact on safety than the autorotation maneuver. failure, or that the airplane might have structural prob- The mere mention of the word “autorotation” at any lems during flight, was very strong. If either of these gathering of helicopter pilots, especially flight instruc- events took place, the pilot’s ability to get the airplane tors, will guarantee a long and lively discussion. safely on the ground quickly was important. The time it took to get the airplane on the ground was directly in There are many misconceptions about autorotations and proportion to the altitude at which the airplane was being they contribute to the accident rate when an autorotation flown. It is therefore logical that all early flights were precedes a helicopter landing accident. One approach to flown at low altitudes, often at less than 500 feet above a discussion of autorotations is to look at the subject the ground (agl). from three views: first, the philosophy of the subject; second, the reality of the circumstances that require au- At these low altitudes, the pilot did not always have the torotations; and third, the execution of the maneuver.
    [Show full text]
  • DYNAMIC MODELING of AUTOROTATION for SIMULTANEOUS LIFT and WIND ENERGY EXTRACTION by SADAF MACKERTICH B.S. Rochester Institute O
    DYNAMIC MODELING OF AUTOROTATION FOR SIMULTANEOUS LIFT AND WIND ENERGY EXTRACTION by SADAF MACKERTICH B.S. Rochester Institute of Technology, 2012 A thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in the Department of Mechanical and Aerospace Engineering in the College of Engineering and Computer Science at the University of Central Florida Orlando, Florida Spring Term 2016 Major Professor: Tuhin Das c 2016 Sadaf Mackertich ii ABSTRACT The goal of this thesis is to develop a multi-body dynamics model of autorotation with the objective of studying its application in energy harvesting. A rotor undergoing autorotation is termed an Autogyro. In the autorotation mode, the rotor is unpowered and its interaction with the wind causes an upward thrust force. The theory of an autorotating rotorcraft was originally studied for achieving safe flight at low speeds and later used for safe descent of helicopters under engine failure. The concept can potentially be used as a means to collect high-altitude wind energy. Autorotation is inherently a dynamic process and requires detailed models for characterization. Existing models of autorotation assume steady operating conditions with constant angu- lar velocity of the rotor. The models provide spatially averaged aerodynamic forces and torques. While these steady-autorotation models are used to create a basis for the dynamic model developed in this thesis, the latter uses a Lagrangian formulation to determine the equations of motion. The aerodynamic effects on the blades that produce thrust forces, in- plane torques, and out-of-plane torques, are modeled as non-conservative forces within the Lagrangian framework.
    [Show full text]
  • WYVER Heavy Lift VTOL Aircraft
    WYVER Heavy Lift VTOL Aircraft Rensselaer Polytechnic Institute 1st June, 2005 1 ACKNOWLEDGEMENTS We would like to thank Professor Nikhil Koratkar for his help, guidance, and recommendations, both with the technical and aesthetic aspects of this proposal. 22ND ANNUAL AHS INTERNATIONAL STUDENT DESIGN COMPETITION UNDERGRADUATE CATEGORY Robin Chin Raisul Haque Rafael Irizarry Heather Maffei Trevor Tersmette 2 TABLE OF CONTENTS Executive Summary.................................................................................................................................. 4 1. Introduction........................................................................................................................................... 9 2. Design Philosophy.............................................................................................................................. 10 2.1 Mission Requirements .................................................................................................................. 11 2.2 Aircraft Configuration Trade Study.............................................................................................. 11 2.2.1 Tandem Design Evaluation.................................................................................................... 12 2.2.2 Tilt-Rotor Design Evaluation ................................................................................................ 15 2.2.3 Tri-Rotor Design Evaluation ................................................................................................
    [Show full text]