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XXXV OSTIV CONGRESS 19 - 23 July 2021 ©Idaflieg Congress Proceedings Die Deutsche Bibliothek – CIP Einheitsaufnahme Die Deutsche Nationalbibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte bibliografische Daten sind im Internet unter http://dnb.d-nb.de abrufbar. Rolf Radespiel, Till Lindner (Eds.) XXXV OSTIV Congress – Congress Program and Proceedings © 2021 ISBN 978-3-947623-42-6 Copyright notice The copyright to all contributed articles collected in this volume resides with the authors. Any reproduction – in parts or as a whole, electronically or in print – of material from within this volume requires the written consent of the author(s). Publisher of OSTIV Conference Proceedings: TU Braunschweig – Niedersächsisches Forschungszentrum für Luftfahrt Hermann-Blenk-Straße 42 • 38108 Braunschweig Tel: 0531-391-9821 Mail: [email protected] Internet: www.tu-braunschweig.de/nfl Copyright Title Page Photo: Idaflieg e.V. II Abstract The XXXV Congress of the International Scientific and Technical Organisation for Gliding (OSTIV) were held as a virtual event from 19 July – 23 July, 2021, as the COVID-19 pandemic did not allow alignment of the Congress with a World Gliding Championship. OSTIV Congresses address all scientific and technical aspects of soaring flight. The Congress 2021 featured 36 presentations from 11 countries. These contributions describe new knowledge in the meteorological fields of atmospheric convection and atmospheric waves. The presentations on sailplane technologies comprise the areas of sailplane design and performance, aerodynamics, aeroelasticity, loads, and propulsion, whereas further contributions cover various aspects of training and safety. These Congress Proceedings lead the participants through the full- week program and make extended abstracts of the presentations accessible to the public. III Foreword Welcome to the virtual OSTIV Congress 2021. Every two years the Congress offers new information and latest research results in soaring and sailplane technology of scientists and engineers from all over the world. The meeting presents unique opportunities for scientific exchange and coordination of future activities. This Congress of the year 2020 was planned to be hosted by the Deutsche Aero Club, along with the 36th FAI World Gliding Championships, in Stendal, Germany. Due to the COVID-19 pandemic the 36th FAI World Gliding Championships were postponed to the year 2021, but the Championships has had to be cancelled. OSTIV is particularly thankful to Stendal’s WGC organizers, who did everything to overcome the difficulties due to COVID-19. In the end, OSTIV decided to organize the Congress as a virtual meeting. Our Call for Abstracts generated response by engineers and scientists from 11 countries worldwide. The received extended abstracts were reviewed and are presented in this proceedings booklet. We believe that an excellent program has been generated this way. For their efforts in recruiting high-quality contributions we acknowledge the members of the Program Committee: Zafer Aslan, Turkey Götz Bramesfeld, Canada Richard Carlson, USA Michael Greiner, Germany Mark Maughmer, USA Judah Milgram, USA Lukáš Popelka, Czech Republic Rolf Radespiel, Germany Gerard Robertson, New Zealand Preparing the Congress took many hours of work by the Organizing Team, consisting of Jennifer Kupke, Rolf Radespiel, Ursula Schamp. We are very thankful for their efforts. Our thanks also go to Till Lindner of Technische Universität Braunschweig for booklet editing. The OSTIV Congress is the perfect setting to bestow the OSTIV Prize 2021 and the OSTIV Best Student Paper Awards. We look forward to the Prize Ceremony and the Congress Closing Session for presenting the Award Winners. We wish all Congress participants an exciting and rewarding week. Prof. Rolf Radespiel Prof. Mark Maughmer OSTIV President OSTIV Vice President IV Table of Abstracts (in order of appearance in Program) Monday, 19 July C. Kensche: Safety Issues in Lifetime Calculations of Sailplanes ................................................................................. 1 J. Schwochow: Gust Response of Elastic Sailplanes ...................................................................................................... 4 L. M. M. Boermans, E. Lasauskas: On the gust loads of sailplanes ............................................................................... 8 A. Ultsch: Naïve transfer of ICAO’s Organizational Safety methods, such as SMS, into club-based flying might be either useless or even harmful ...................................................................................................................................... 13 D. Nadler: Improving Motorglider Safety and Reliability ........................................................................................... 14 K. Höck: Investigation about Safety in Winch Launching ........................................................................................... 15 W. Scholz, S. Leis, V. Petters, W. Würz, J. Axthelm, W. Fichter: ASASys – Anti-Stall Assistant System for Sailplanes ................................................................................................. 19 Tuesday, 20 July E. Braun: DLR’s latest research sailplane: Discus-2c DLR ........................................................................................ 23 F. Johnke, J. F. Santosa, M. Habermann: fs36 Fly-by-Wire of the Akademische Fliegergruppe Stuttgart ................ 27 W. Scholz, J. Schneider, A. Strohmayer, S. Notter, W. Fichter: icaré 2 wtp – Fly with light and control by thrust ..... 31 B. Neininger: Status report about AlpTherm_2 as a fully revised convection model .................................................. 35 O. Maas, D. Etling: On the influence of moisture on the strength of thermals: A large-eddy simulation case study .. 39 A. O. Mut, F. B. Demir, H. Temur, Z. Aslan: Examination of the Microburst Incident in Istanbul, July 2017 ........... 44 Wednesday, 21 July S. Senger, R. Klein: E-ROP electric and rotary engined hybrid plane .......................................................................... 47 Jan Pytka, A. Rypulak, Z. Czyż, R. Bąbel, K. Gierczak, Jar. Pytka, R. Kliza, K. Hryć: Experimental Verification of the PROPWING Propulsion System – First Tests of a Model Motor Glider................. 49 A. R. Ramesh, K. C. Mallette, H. Kim, B. Bissonnette, G. Bramesfeld: CREATeV: An Exploration of a Solar-Powered, Ultra-Long Endurance UAV .......................................................... 53 M. Greiner, W. Würz: Laminar separation bubbles at unsteady inflow conditions – a status report .......................... 57 F. El Tin: Sink Polar Analysis for Unmanned Aerial Gliders using the USAF Datacom ............................................ 62 L. Metkowski, M. Maughmer: A Design Study on the Application of Slotted, Natural-Laminar-Flow Airfoils on 18-Meter Sailplanes.................... 63 I. Weisheit: Microbiological examination of aeroplane control elements .................................................................... 69 T. Weigelt: Experiences from Flight Testing in the Idaflieg ........................................................................................ 72 Thursday, 22 July T. Lindner, C. Rolffs, N. Dierksen, R. Ökzüz, S. Scheffler, O. Dorn: Proceedings in the Development of a Crashworthy Glider Cockpit ............................................................................ 75 L. Fohlmeister, T. J. Adam, B. Schwarz: Optical deformation measurement of a two-seater cockpit under emergency landing conditions during a quasi-static load test ........................................................................................................ 78 M. Melville, G. Bramesfeld, J. Cole: An Integrated Flight Dynamic Model for Flexible Aircraft .............................. 82 B. Neininger, A. de Orleans-Borbon: A climatology of soaring conditions in Eurasia ............................................... 87 C. Lindemann: Wave Flying Experiences - Examples of Observations and its Interpretation .................................... 91 E. Hindman: Ascend Mount Everest via paraglider? ................................................................................................... 93 S. ÇİL, H. Q. Adeeb, R. A. Al-bayati: Satellite Observation of a Deep Convective Storm Top at Kastamonu, Turkey - A Case Study. ................................ 97 V J.-M. Clément: Discovering the Tropical Gravity Wave ............................................................................................. 99 Friday, 23 July M. Greiner: Two birds with one stone (and one trailer) ............................................................................................ 102 K. Rohde-Brandenburger: Inflight Measurements of Control Surface Deflection in Circling Flight ........................ 106 F. Sturm, M. Hornung: Morphing Shell Design of a Sailplane with a Morphing Forward Wing Section ................. 109 O. P. Neto, G. Pogorzelski, A. M. Neves: A numerical method for kinematic and structural optimization of sailplane mechanical flight control systems ....... 113 J. Condé-Wolter, P. J. Steinbild, P. Kostka, T. Ehrig, A. Winkler, N. Modler, F. Sell: Load monitoring for sailplanes utilizing an innovative carbon fibre-based, spatially resolved strain sensor ............ 117 VI VII OSTIV Congress 2021 Abstracts 19 July 2021 Safety Issues in Lifetime Calculations of Sailplanes Christoph Kensche Stuttgart, [email protected]
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