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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. -
Soaring Magazine Index for 1990 to 1999/1990To1999 Organized by Subject
Soaring Magazine Index for 1990 to 1999/1990to1999 organized by subject The contents have all been re-entered by hand, so thereare going to be typos and confusion between author and subject, etc... Please send along any corrections and suggestions for improvement. 1-26 Bob Dittert, 1-26s + Rain = Championship,December,1999, page 24 1-26 Association Bob Hurni, 1991 1-26 Championships (Caesar Creek),January,1992, pages 18-24 George Powell, The Stealth Glider,January,1992, pages 28-30 MikeGrogan, Hallelujah! I Am Flying Again,January,1992, pages 35-39 Harry Senn, Why 1-26’sDon’tFly Sports Class,February,1992, pages 39-41 Luan & John Walker, 1992 1-26 Championships (Midlothian, TX),January,1993, pages 40-44 Joe Walter, What a Contest (the 1-26 Championships),October,1993, page 3 Jim Hard, (1993) 1-26 Championships at Albert Lea, Minnesota,November,1993, pages 19-25 TomHolloran, GPS: The First Year-Almost,November,1993, pages 26, 28-30 1000 Kilometer Flights Robert Penn, Sixteen Contestants Fly 1000 KilometersinPossible World RecordContest Task,No- vember,1990, page 15 YanWhytlaw, The 1000 KM Club,March, 1992, pages 20-23 KenKochanski, The Joy of Soaring (1000KM from Blairstown by Bob Templin and Ken Kochanski)!, September,1992, page 6 Sterling V.Starr, 1000KM in the Sky! (Over the Sierraand White Mountains),March, 1993, pages 42-45 Advertising Mark Kennedy, Soaring in Action: Please Note! (No) July Classified Ads,June, 1997, page 14 Convenience and Savings (with Soaring Classifieds),October,1997, page 4 Aerobatics Wade Nelson, An Aerobatic Ride at Estrella,January,1990, page 3 Trish Durbin, Cat Among the Pigeons,February,1990, page 20 Bob Kupps, The ThirdWorld Glider Aerobatic Championships (Hockenheim),March, 1990, page 15 Trish Durbin, Author’sResponse (to "Cat Among the Pigeons" Complaints),July,1990, page 2 Thomas J. -
IGC Plenary 2005
Agenda of the Annual Meeting of the FAI Gliding Commission To be held in Lausanne, Switzerland on 5th and 6th March 2010 Agenda for the IGC Plenary 2010 Day 1, Friday 5th March 2010 Session: Opening and Reports (Friday 09.15 – 10.45) 1. Opening (Bob Henderson) 1.1 Roll Call (Stéphane Desprez/Peter Eriksen) 1.2 Administrative matters (Peter Eriksen) 1.3 Declaration of Conflicts of Interest 2. Minutes of previous meeting, Lausanne, 6th-7th March 2009 (Peter Eriksen) 3. IGC President’s report (Bob Henderson) 4. FAI Matters (Mr.Stéphane Desprez) 4.1 Update by the Secretary General 5. Finance (Dick Bradley) 5.1 2009 Financial report 5.2 Financial statement and budget 6. Reports not requiring voting 6.1 OSTIV report (Loek Boermans) Please note that reports under Agenda items 6.2, 6.3 and 6.4 are made available on the IGC web-site, and will not necessarily be presented. The Committees and Specialists will be available for questions. 6.2 Standing Committees 6.2.1 Communications and PR Report (Bob Henderson) 6.2.2 Championship Management Committee Report (Eric Mozer) 6.2.3 Sporting Code Committee Report (Ross Macintyre) 6.2.4 Air Traffic, Navigation, Display Systems (ANDS) Report (Bernald Smith) 6.2.5 GNSS Flight Recorder Approval Committee (GFAC) Report (Ian Strachan) 6.2.6 FAI Commission on Airspace and Navigation Systems (CANS) Report (Ian Strachan) Session: Reports from Specialists and Competitions (Friday 11.15 – 12.45) 6.3 Working Groups 6.3.1 Country Development Report (Alexander Georgas) 6.3.2 Grand Prix Action Plan (Bob Henderson) 6.3.3 History Committee (Tor Johannessen) 6.3.4 Scoring Working Group (Visa-Matti Leinikki) 6.4 IGC Specialists 6.4.1 CASI Report (Air Sports Commissions) (Tor Johannessen) 6.4.2 EGU/EASA Report (Patrick Pauwels) 6.4.3 Environmental Commission Report (Bernald Smith) 6.4.4 Membership (John Roake) 6.4.5 On-Line Contest Report (Axel Reich) 6.4.6 Simulated Gliding Report (Roland Stuck) 6.4.7 Trophy Management Report (Marina Vigorita) 6.4.8 Web Management Report (Peter Ryder) 7. -
February,February, 20052005
THETHE OFFICIALOFFICIAL PUBLICATIONPUBLICATION OFOF THETHE WOMENWOMEN SOARINGSOARING PILOTSPILOTS ASSOC.ASSOC. February,February, 20052005 Www.womensoaring.org IIN THIS ISSUE 2005 Seminar PAGE 2 July 11-15, 2005 at Air Sailing Gliderport Reno, NV From the President For contact: Terry Duncan by Lucy Anne McKoski [email protected] Badges by Helen D’Couto Phone 408 446-0847 From the Editor by Frauke Elber PAGE 3 Convention Report by Colleen Koenig PAGE 4 TuesdayTuesday FlightFlight byby CindyCindy BricknerBrickner PAGE 5 On Line Contest PAGE 6 Motorless Flight Sympo- sium,Facts and Trends, but Safety First by Roberta Fischer Malara PAGE 7 FOD Happens by Joel Cornell PAGE 8 Lindbergh Trophy Help needed InvitationInvitation toto WSPAWSPA Welcome new members PAGE 9 HOW TO DRESS FOR WINTER FLYING Hear Say The above picture shows Ginny Schweizer ready for a flight from Harris Hill in the winter of 1940 in the open cockpit Kirby Kite which required special clothing to keep warm. PAGE 10--11 Rather than trying to explain what she wore she had submitted this picture which was taken by Scholarships and Scholarship Hans Groenhoff (Another great soaring pioneer. Ed.) The photo and story was published in Applications Life Magazine Ginny said that being launched by auto tows in that open sailplane on a very cold day was thrilling and a lot of fun. She had no problem keeping warm with all those flying clothes which were also used for a New Year Day’s flight. Thanks to Kay Gertsen, editor of Ridgewind, newsletter of the Harris Hill Soaring. Corp page 2 February 2005 THE WOMEN SOARING PILOTS Badges through Silver Altitude ASSOCIATION (WSPA) WAS Cheryl Beckage FOUNDED IN 1986 AND IS Dec.15, 2005 Mary Cowie AFFILIATED WITH THE SOARING by Helen D’Couto Katherine (Kat) Haessler SOCIETY OF AMERICA Silver Distance ANNUAL DUES (JULY-JUNE) ARE $10. -
Minimoa SN4 April 2019
Magazine for Pilots & Fans of Schempp-Hirth Sailplanes - April 2019 / No.4 Discus-2c “supercharged”: The FES A New Game Is on for a Sailplane Adventures Around the World From Denmark and Canada to the South Hemisphere Formula 1.0: Fun’n’Dust in Australia Old Plastic Tins Get Some Fun with GP Concept Editorial Ralf & Tilo Holighaus / [email protected] 02 Minimoa No. 4, Apr. 2019 > Fly Denmark! 12 > Formula 1.0: Australia 16 CONTRIBUTORS. Jorgen Thomsen, Makoto Ichikawa, Chester Fitchett, Andrew Peng Du, Morten Bennick, Vladimir Fedorov, Nick Gilbert, Adam Lanson, Tilo Holighaus, Ralf Ho - lighaus, Benjamin Neglais Editor: Ralf Holighaus [email protected] Design: Benjamin Neglais, Ralf Holighaus Pictures: Francois Jeremiasse, Benjamin Neglais, Chris Wilson, Morten Bennick, Andrew Peng Du, Makoto Ichikawa, f1gp.com.au, Chester Fitchett > Discus-2c “supercharged”: The FES 04 Editorial Solar Power 2018 was probably one of the best ever years for glid - On the same basis, gliders of all vendors together cir - ing in Europe, with record weather conditions far beyond cled the globe in average 3.75 times every day - and this average. Flights adding up to an amazing 54 Million km figure only covers the flights that were actually uploaded have been scored in the OLC and we are very proud that to the OLC! These figures should help each of you to Schempp-Hirth gliders from Cirrus to Ventus-3 have con - demonstrate to the World that we are one of the most tributed 21 Million km in more than 58,000 flights, rep - environment-friendly sports, having relied on using solar resenting almost 40% of all uploaded kilometers. -
Soaring Magazine Index for 1999/1999 Organized by Author
Soaring Magazine Index for 1999/1999 organized by author The contents have all been re-entered by hand, so there are going to be typos and confusion between author and subject, etc... Please send along any corrections and suggestions for improvement. Department, Columns, or Sections of the magazine are indicated within parentheses '()'. Subject, and sub-subject, are indicated within square brackets '[]'. Adams, Michael (a.k.a. Mike Adams M. Adams) Safety Devices for L'Hotellier (Soaring In Action) [Safety], July, page 7 Alexander, Jaime P. A Question Raised (Soaring Mail) [Magazine], February, page 5 Ard, Bill Announcing the New Motorglider (Soaring in Action) [Motorglider\Russia], January, page 9 Russia AC-4 Kit Due Soon (Soaring in Action) [Sailplanes\Russia AC-4], April, page 9 Thank You Knoxville (Soaring Mail) [Conventions\Knoxville], May, page 4 Ready for the Millennium (Soaring News) [Sailplanes\Russia], November, page 8 Ballistic Parachutes (SSA Mail) [Equipment], December, page 5 Russias in the World Class (SSA Mail) [Sailplanes\Russia; World Class], December, page 6 Arterburn, Ken Way to Go, Ed (Soaring Mail) [Club], April, page 5 Ash®eld, Keith M. An Andes Alternative (Feature Article) [Soaring Sites\Argentina], August, page 34 Babiarz, Arthur; with Jim Spontak Glider Fun Fly-In (SSA Mail) [Competitions], August, page 3 Baer, Joseph And the Response (Soaring Mail) [Magazine], February, page 6 Baldwin, Rand The 1999 Region 5 South Contest at Cordele, Georgia (Soaring News) [Competition\Cordelle], November, page 5 Beavers, John Need to be Seen (Soaring News), September, page 3 Bell, Doug Winch Launch in Australia (Cover) [Winch\Australia], August, cover Blacksten, Raul Sailplanes by Schweizer: A History by Paul A. -
Perpetual Flight in Flow Fields
Perpetual Flight in Flow Fields by Ricardo Ayres Gomes Bencatel A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Electrical and Computer Engineering) in the University of Porto, School of Engineering Faculdade de Engenharia da Universidade do Porto 2011 Doctoral Committee: Professor Fernando Lobo Pereira, Chair Professor Anouck Girard Associate Lu´ısaBastos Doctor Jos´eMorgado c Ricardo Ayres Gomes Bencatel 2012 All Rights Reserved To my family and my girlfriend, who supported my endeavors and endured the necessary absences. v ACKNOWLEDGEMENTS I thank with all my heart my family and my girlfriend for the support in the easy and the hard times, and for the encouragement to always do my best and surpass myself. Furthermore, I would like to thank the friendship of Nuno Costa with whom I developed and tested several model aircraft, which contributed to the knowledge required for this work. I would like to thank the support from AsasF group and the researchers from the Un- derwater Systems and Technology Laboratory, specially Jo~aoSousa and Gil Gon¸c´alves, and Pedro Almeida for their support, and in particular Jo~aoCorreia, Joel Gomes, Eduardo Oliveira, Rui Caldeira, Filipe Ferreira, Bruno Terra, Filipe Costa Ferreira, Joel Cardoso, and S´ergioFerreira for their friendship, support, and assistance. I gratefully acknowledge the support of the Portuguese Air Force Academy, specially Cap. El´oiPereira, Lt. Tiago Oliveira, Cap. Jos´eCosta, Sgt. Joaquim Gomes, Sgt. Paulo Teixeira, Lt. Gon¸caloCruz, Lt. Col. Morgado, Maj. Madruga, Lt. Jo~aoCaetano, and Sgt. Fernandes. I'm most grateful for the time I spend at the Aerospace Department from the University of Michigan. -
REPORT No. 201
REPORT No. 201 THE EFFECTS OF -SHIELDING THE THIS OF AIRFOILS By ELLIOTT G. IWD Langley Memorial Aeronautical Laboratory 3-M REPORT No. 201 THE EFFECTS OF SHIELDING THE TIPS OF AIRFOILS By ELLIOTT G. REID SUMMARY Tests have recently been made at Langley Memorial Aeronautical Laboratory to ascertain whet her the aerodynamic characteristics of an airfoil might be subst antiall-j -impro~ed by imposing certain limitations upon the airflow about its tips. AU of the moditied forms were slightly inferior to the plain airfoil at small lift coefikients; however, by mounting thin plates, in planes perpendicular to the span, at the W@ tips, the characteristics were impro~ed throughout the range above three-tenths of the masimum lift coefficient. With this form of limitation the detrimental effect was slight; at the higher lift .—— coefEcients there resulted a eorsiderable reduction of induced drag and, consequently, of pow-er required for sustentation. The s16pe of the curve of lift ~erws angle of attack was increased. OUTLINE OF TESTS These tests wwe directed to-ward the disco~ery of some economical means of increasing the “ effecti~e aspect ratio” of an airfol As it. is recognized that the induced drag of an airfoiI is inversely proportional to its aspect ratio and that elimination of the transverse velocity, components of the air.tlow about a wing reproduces, in effecfi, the conditions which wouId exist with Mnite aspect ratio, it was planned to investigate the effects of elimination of a portion of the transverse flow by. fln.ite barriers at. the tips and ‘also by the production of an aer~- dcynamic counterforee, in lieu of the com- straints:-by the localization of severe washout at the tzps. -
Space & Electronic Warfare Lexicon
1 Space & Electronic Warfare Lexicon Terms 2 Space & Electronic Warfare Lexicon Terms # - A 3 PLUS 3 - A National Missile Defense System using satellites and ground-based radars deployed close to the regions from which threats are likely. The space-based system would detect the exhaust plume from the burning rocket motor of an attacking missile. Forward-based radars and infrared-detecting satellites would resolve smaller objects to try to distinguish warheads from clutter and decoys. Based on that data, the ground-based interceptor - a hit-to-kill weapon - would fly toward an approximate intercept point, receiving course corrections along the way from the battle management system based on more up-to-date tracking data. As the interceptor neared the target its own sensors would guide it to the impact point. See also BALLISTIC MISSILE DEFENSE (BMD.) 3D-iD - A Local Positioning System (LPS) that is capable of determining the 3-D location of items (and persons) within a 3-dimensional indoor, or otherwise bounded, space. The system consists of inexpensive physical devices, called "tags" associated with people or assets to be tracked, and an infrastructure for tracking the location of each tag. NOTE: Related technology applications include EAS, EHAM, GPS, IRID, and RFID. 4GL - See FOURTH GENERATION LANGUAGE 5GL - See FIFTH GENERATION LANGUAGE A-POLE - The distance between a missile-firing platform and its target at the instant the missile becomes autonomous. Contrast with F-POLE. ABSORPTION - (RF propagation) The irreversible conversion of the energy of an electromagnetic WAVE into another form of energy as a result of its interaction with matter. -
A Glider Pilot Bold... Wally Kahn a Glider Pilot Bold
A Glider Pilot Bold.. f ttom % fRfltng liBttattg of A Glider Pilot Bold... Wally Kahn A Glider Pilot Bold... Wally Kahn First edition published by Jardine Publishers 1998 Second edition published by Airplan Flight Equipment Ltd Copyright ©2008 Third edition published by Walter Kahn 2011 Copyright ©WALTER KAHN (1998 & 2008) and Airplan Flight Equipment (2008) WALTER KAHN 2011 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form, or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publisher, except by a reviewer who wishes to quote brief passages in connection with a review written for inclusion in a newspaper, magazine, or radio or television broadcast. Every effort has been made by the author and the publishers to trace owners of copyright material. The events described have been cross-checked wherever possible and the author apologises for any errors or omissions which may have arisen. Cover photograph courtesy Neil Lawson. White Planes Co A Glider Pilot Bold... 1st Edition original cover Contents Another bite of the cherry .................................................................................9 Chapter 1 The early days and Oerlinghausen ..........................................15 Chapter 2 More Oerlinghausen.................................................................19 Chapter 3 Mindeheide and Scharfholdendorf ...........................................29 Chapter 4 Dunstable and Redhill -
May 1983 Issue of Soaring Magazine
Cambridge Introduces The New M KIV NA V Used by winners at the: 15M French Nationals U.S. 15M Nationals U.S. Open Nationals British Open Nationals Cambridge is pleased to announce the Check These Features: MKIV NAV, the latest addition to the successful M KIV System. Digital Final Glide Computer with • "During Glide" update capability The MKIV NAV, by utilizing the latest Micro • Wind Computation capability computer and LCD technology, combines in • Distance-to-go Readout a single package a Speed Director, a • Altitude required Readout 4-Function Audio, a digital Averager, and an • Thermalling during final glide capability advanced, digital Final Glide Computer. Speed Director with The MKIV NAV is designed to operate with the MKIV Variometer. It will also function • Own LCD "bar-graph" display with a Standard Cambridge Variometer. • No effect on Variometer • No CRUISE/CLIMB switching The MKIV NAV is the single largest invest ment made by Cambridge in state-of-the-art Digital 20 second Averager with own Readout technology and represents our commitment Relative Variometer option to keeping the U.S. in the forefront of soar ing instrumentation. 4·Function Audio Altitude Compensation Cambridge Aero Instruments, Inc. Microcomputer and Custom LCD technology 300 Sweetwater Ave. Bedford, MA 01730 Single, compact package, fits 80mm (31/8") Tel. (617) 275·0889; TWX# 710·326·7588 opening Mastercharge and Visa accepted BUSINESS. MEMBER G !TORGLIDING The JOURNAL of the SOARING SOCIETYof AMERICA Volume 47 • Number 5 • May 1983 6 THE 1983 SSA INTERNATIONAL The Soaring Society of America is a nonprofit SOARING CONVENTION organization of enthusiasts who seek to foster and promote all phases of gliding and soaring on a national and international basis. -
BRITISH MILITARY GLIDERS Author Glyn Bradney Description British Designed and Built Military Gliders Date 19Th October 2014, Version 2)
GLIDING HERITAGE CENTRE BRITISH MILITARY GLIDERS Author Glyn Bradney Description British designed and built Military Gliders Date 19th October 2014, version 2). INTRODUCTION To-date I’ve written 6 Reference Guides on the British built and designed sporting gliders of what I might term the “wooden” era – Slingsbys, Elliotts of Newbury, Abbott Baynes (Scuds), BAC, the Scott gliders, and the Bill Manuel gliders. These account for at least 98% of all the wooden gliders ever built in Great Britain. There are of course a few smaller manufacturers, especially in the formative days of the British gliding movement in the early 1930s, RFD and Cloudcraft are two of these. Additionally there’s a plethora of “one offs”, principally Primaries, again mostly built in the early 1930s. I don’t propose to write these up as for the great majority of the remaining 2% we’re talking 80 years ago at least, and there’s no connect at all with the modern day and consequently very little interest unless it’s for the outright gliding aficionado. However, whilst they’re most definitely not sporting gliders there is one subject I think there is a justification to cover, and that’s the one of British military gliders. Spawned by the Second World War military gliders held centre stage for only a very few years, the advent of the troop carrying helicopter consigning them to history. Note all of the British military gliders were named after famous military figures whose name began with an “H”. As to the sources my main ones have been: Norman Ellison’s “British Gliders and Sailplanes 1922 – 1970” ISBN 0 7136 1189 8 The gliding magazines made available by the Lakes Gliding Club via their website – http://www.lakesgc.co.uk/ - <Archive><Old Gliding Mags> Wikipedia sourced articles David Underwood for details of what British gliders are still in existence and where they are As always if you have new and interesting information and/or photos, else you believe there are mistakes, please contact the author at [email protected] Glyn Bradney.