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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">donstu</journal-id><journal-title-group><journal-title xml:lang="en">Advanced Engineering Research (Rostov-on-Don)</journal-title><trans-title-group xml:lang="ru"><trans-title>Advanced Engineering Research (Rostov-on-Don)</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2687-1653</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">donstu-776</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>TECHNICAL SCIENCES</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТЕХНИЧЕСКИЕ НАУКИ</subject></subj-group></article-categories><title-group><article-title>DETERMINATION OF OPTIMAL AZIMUTH FOR MOUNTING ULTRALIGHT COAXIAL HELICOPTER BLADES</article-title><trans-title-group xml:lang="ru"><trans-title>Определение оптимального азимута установки лопастей соосного сверхлегкого вертолета</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дудник</surname><given-names>Виталий Владимирович</given-names></name><name name-style="western" xml:lang="en"><surname>Dudnik</surname><given-names>Vitaly V.</given-names></name></name-alternatives><email xlink:type="simple">vvdudnik@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Колот</surname><given-names>Владимир Александрович</given-names></name><name name-style="western" xml:lang="en"><surname>Kolot</surname><given-names>Vladimir A.</given-names></name></name-alternatives><email xlink:type="simple">bobahhe@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Донской государственный технический университет<country>Россия</country></aff><aff xml:lang="en">Don State Technical University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2011</year></pub-date><pub-date pub-type="epub"><day>30</day><month>12</month><year>2011</year></pub-date><volume>11</volume><issue>5</issue><fpage>667</fpage><lpage>675</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Dudnik V.V., Kolot V.A., 2011</copyright-statement><copyright-year>2011</copyright-year><copyright-holder xml:lang="ru">Дудник В.В., Колот В.А.</copyright-holder><copyright-holder xml:lang="en">Dudnik V.V., Kolot V.A.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.vestnik-donstu.ru/jour/article/view/776">https://www.vestnik-donstu.ru/jour/article/view/776</self-uri><abstract><p>The possibility of reducing vibration of the ultralight coaxial helicopter blades on the through harmonic wave by mounting blades on the optimal azimuth is shown. The methods of the aerodynamic calculation of rotors and the calculation results for the horizontal flight of “Rotorfly” helicopter are offered. The optimal azimuth of blades intersection is defined as 37.5 degrees angle along the direction of the upper rotor rotation.</p></abstract><trans-abstract xml:lang="ru"><p>Обоснована возможность снижения вибрации сверхлегкого соосного вертолета на проходной гармонике посредством установки лопастей на оптимальном азимуте. Представлены методика аэродинамического расчета винтов и результаты расчетов для горизонтального полета вертолета «Роторфлай». Определено, что оптимальным азимутом встречи лопастей является угол 37,5 градусов по направлению вращения верхнего винта.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>соосный вертолет</kwd><kwd>лопасть</kwd><kwd>несущий винт вертолета.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>coaxial helicopter</kwd><kwd>blade</kwd><kwd>helicopter rotor.</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Белоцерковский С.М. Исследование на ЭВМ аэродинамических и аэроупругих характеристик винтов вертолетов / С.М. Белоцерковский, Б.Е. Локтев, М.И. Ништ. – М.: Машиностроение, 1992. – 160 с.</mixed-citation><mixed-citation xml:lang="en">Belocerkovskij S.M. Issledovanie na E`VM ae`rodinamicheskix i ae`rouprugix xarakteristik vintov vertolyotov / S.M. Belocerkovskij, B.E. Loktev, M.I. 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