{"id":10245,"date":"2015-08-05T12:54:45","date_gmt":"2015-08-05T19:54:45","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=10245"},"modified":"2015-08-05T12:55:29","modified_gmt":"2015-08-05T19:55:29","slug":"81-hour-solar-flight-best-class","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/81-hour-solar-flight-best-class\/","title":{"rendered":"\u00a081.5-Hour Solar Flight \u2013 Best in Class"},"content":{"rendered":"<hr \/>\n<p>Following Andre\u2019 Borschberg\u2019s record-breaking endurance and distance flight in Solar Impulse last month, the accomplishment of a group of Swiss students and their planned trans-Atlantic, <a href=\"http:\/\/robohub.org\/solar-powered-flight-for-81-hours-a-new-endurance-world-record\/\">solar-powered autonomous flight<\/a> are equally worthy of consideration.<\/p>\n<p>With a much smaller budget than Solar Impulse, the students are planning <a href=\"http:\/\/www.atlantiksolar.ethz.ch\/wp-content\/downloads\/AtlantikSolar_ProjectBrochure_websiteversion.pdf\">a 5,000 kilometer (3,100 mile) flight from Bell Island, Canada to Lisbon, Portugal<\/a>, a seven-day test of self-guided navigation and autonomous airmanship.\u00a0 Recent achievements by the team suggest that success will come from good design and careful planning.<\/p>\n<div id=\"attachment_10246\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_launch.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10246\" class=\"size-large wp-image-10246\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_launch-528x352.jpg\" alt=\"Hand launch is one of few moments during 81-hour flight that the airplane was not in autonomous mode\" width=\"528\" height=\"352\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_launch-528x352.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_launch-300x200.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_launch.jpg 1024w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-10246\" class=\"wp-caption-text\">Hand launch is one of few moments during 81.5-hour flight that the airplane was not in autonomous mode<\/p><\/div>\n<p>Last month, their AtlantikSolar 2 Unmanned Aerial Vehicle made its first 24-hour flight.\u00a0 (The team generously acknowledges American Alan Cocconi\u2019s 48-hour, solar-powered flight with his 13-kilogram (28.6 pound) So Long in 2005.)<\/p>\n<p><iframe loading=\"lazy\" title=\"Solar-powered 81 hour endurance world record flight\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/8m4_NpTQn0E?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Only two weeks later, the <a href=\"http:\/\/www.asl.ethz.ch\/\">ETH (Swiss Federal Institute of Technology) Zurich<\/a> students from the Autonomous Systems Lab managed an 81.5 hour flight that sent their 5.6 meter (18.6 feet) wingspan, 6.8 kilogram (15 pound) UAV 2,316 kilometers (1,436 miles).\u00a0 This broke the world record for flight endurance in the airplane\u2019s class, the team explaining this is the \u201clongest ever demonstrated continuous flight of all aircrafts below 50kg total mass, and is also the longest-ever continuous flight of a low-altitude long-endurance (LALE) aircraft (the previous record being a 48-hour flight by the 13kg\u00a0<a href=\"http:\/\/www.google.com\/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;ved=0CB4QFjAAahUKEwipmqfXiujGAhVBjSwKHdvOB9I&amp;url=http%3A%2F%2Fwww.tu.no%2Fmigration_catalog%2F2005%2F07%2F24%2Fsolong-info%2Fbinary%2FSoLong%2520info&amp;ei=Mg-sVam5NMGasgHbnZ-QDQ&amp;usg=AFQjCNGmo8c_pDw0DCNUSjGPdi3LWIF34w&amp;sig2=zBK6JtcW63a4O_RyMoP0Gg&amp;bvm=bv.98197061,d.bGg\">SoLong UAV\u00a0<\/a>).\u201d<\/p>\n<div id=\"attachment_10247\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_night_flight-1024x803.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10247\" class=\"size-large wp-image-10247\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_night_flight-1024x803-528x414.jpg\" alt=\"Navigation lights form arc in night sky \" width=\"528\" height=\"414\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_night_flight-1024x803-528x414.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_night_flight-1024x803-300x235.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_night_flight-1024x803.jpg 1024w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-10247\" class=\"wp-caption-text\">AtlantikSolar 2&#8217;s Navigation lights form arc in night sky<\/p><\/div>\n<p>This great effort, the third longest solar flight ever, trails only Airbus Space\u2019s (formerly QinetiQ\u2019s) 53-kilogram (116.6 pound) Zephyr 7 and the 2,300 kilogram (5,060 pound) Solar Impulse 2.\u00a0 It is the fifth-longest flight ever demonstrated by any aircraft (both manned and unmanned), according to ETH.<\/p>\n<p>The flight, from the Rafz, Switzerland radio-controlled model airfield, took place between July 14th and 17th, the first three days being sunny.\u00a0 After four days and three nights, the aircraft landed with batteries fully charged \u2013 able to have carried the craft through another night.\u00a0 With the hand launch taking place at 09:32 on the 14th, batteries were fully charged each day thereafter by 13:05 local time each day, even before maximum sunlight (solar noon) at around 13:30 each day.<\/p>\n<p>Philipp Oettershagen, currently a research assistant and PhD student at ETH Zurich\u2019s Autonomous Systems Lab (ASL), reports, \u201cWith the exception of takeoff, the aircraft was in fully-autonomous operation 98% of the time, and less than 2% in autopilot-assisted mode via its\u00a0<a href=\"https:\/\/pixhawk.org\/modules\/pixhawk\">Pixhawk\u00a0autopilot<\/a>.\u201d<\/p>\n<div id=\"attachment_10249\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_storm-1024x680.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10249\" class=\"size-large wp-image-10249\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_storm-1024x680-528x351.jpg\" alt=\"Approaching storm made last day's flight difficult, subjected airplane to strong vertical gusts\" width=\"528\" height=\"351\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_storm-1024x680-528x351.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_storm-1024x680-300x199.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_storm-1024x680.jpg 1024w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-10249\" class=\"wp-caption-text\">Approaching storm made last day&#8217;s flight difficult, subjected airplane to strong vertical gusts<\/p><\/div>\n<p>AtlantikSolar 2 consumed an average of 35 to 46 Watts in level flight and under calm conditions.\u00a0 Maximum input from the 88 SunPower E60 solar cells during each day was around 260 Watts, enabling the plane to fly through the following night and face the sunrise with a minimum state of charge around 35 percent.\u00a0 This would allow the plane to continue with enough energy to make it through longer nights, clouds, or winds, the latter two of which affected the flight\u2019s last day.<\/p>\n<p>Thermal updrafts during the first evening and night, followed by downdrafts during the second night dropped the battery capacity to 32 percent, their lowest level throughout the four days.\u00a0 The airplane survived structural loads imposed by arriving thunderstorms and the strongest winds \u2013 up to 60 kilometers per hour (37.2 mph) \u2013 experienced on the last day. \u00a0Gusts were strong enough to partially damage the ground station, but the airplane landed safely in autopilot-assisted mode when the winds dropped.<\/p>\n<div id=\"attachment_10250\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_FieldTrials-Large-1024x682.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10250\" class=\"size-large wp-image-10250\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_FieldTrials-Large-1024x682-528x352.jpg\" alt=\"Two of ETH-ASL's autonomous aircraft with the group hoping to see them cross the Atlantic\" width=\"528\" height=\"352\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_FieldTrials-Large-1024x682-528x352.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_FieldTrials-Large-1024x682-300x200.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2015\/08\/AtlantikSolar_FieldTrials-Large-1024x682.jpg 1024w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-10250\" class=\"wp-caption-text\">Two of ETH-ASL&#8217;s autonomous aircraft with the group hoping to see them cross the Atlantic<\/p><\/div>\n<p>In the near future, a \u201cswarm\u201d of four Atlantik Solar 2\u2019s will be launched from Bell Island into \u201cthe harsh Atlantic environment, with the hopes that all will make it through seven days and nights of unpredictable weather and contrary winds to make it to Portugal.<\/p>\n<p>After that, the aircraft will test optical and infrared cameras and atmospheric sensors.\u00a0 Some of these flights will take 12 hours and cover 400 kilometers (248 miles) over the Brazilian rain forest. \u00a0\u00a0Later developments will include evaluation of the aircraft to provide telecommunications services in large-scale disasters, or live images during industrial sensing and inspections missions.<\/p>\n<p>We wish the ETH ASL team all the best in their endeavors, and hope to hear of a successful Atlantic crossing soon.<\/p>\n<div id=\"facebook_like\"><iframe src=\"http:\/\/www.facebook.com\/plugins\/like.php?href=http%3A%2F%2Fcafe.foundation%2Fblog%2F81-hour-solar-flight-best-class%2F&amp;layout=standard&amp;show_faces=true&amp;width=500&amp;action=like&amp;font=segoe+ui&amp;colorscheme=light&amp;height=80\" scrolling=\"no\" frameborder=\"0\" style=\"border:none; overflow:hidden; width:500px; height:80px;\" allowTransparency=\"true\"><\/iframe><\/div>","protected":false},"excerpt":{"rendered":"<p>Following Andre\u2019 Borschberg\u2019s record-breaking endurance and distance flight in Solar Impulse last month, the accomplishment of a group of Swiss students and their planned trans-Atlantic, solar-powered autonomous flight are equally worthy of consideration. With a much smaller budget than Solar Impulse, the students are planning a 5,000 kilometer (3,100 mile) flight from Bell Island, Canada [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[15,14],"tags":[6559,132,6555,6562,6556,6557,6563,6561,6554,6558,4840,6560,4968,4721,845,844],"class_list":["post-10245","post","type-post","status-publish","format-standard","category-electric_powerplants","category-sustainable_ga","tag-airbus-space","tag-alan-cocconi","tag-atlantiksolar-2-airplane","tag-bell-island-canada","tag-eth-swiss-federal-institute-of-technology-zurich","tag-eth-autonomous-systems-lab","tag-lisbon-portugal","tag-low-altitude-long-endurance-lale-aircraft","tag-philipp-oettershagen","tag-pixhawk-autopilot","tag-qinetiq-zephyr","tag-so-long-solar-powered-airplane","tag-solar-impulse-2","tag-trans-atlantic-flight","tag-uavs","tag-unmanned-aerial-vehicles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00a081.5-Hour Solar Flight \u2013 Best in Class - CAFE Foundation Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/cafe.foundation\/blog\/81-hour-solar-flight-best-class\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00a081.5-Hour Solar Flight \u2013 Best in Class - CAFE Foundation Blog\" \/>\n<meta property=\"og:description\" content=\"Following Andre\u2019 Borschberg\u2019s record-breaking endurance and distance flight in Solar Impulse last month, the accomplishment of a group of Swiss students and their planned trans-Atlantic, solar-powered autonomous flight are equally worthy of consideration. 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