{"id":8827,"date":"2014-04-22T12:39:11","date_gmt":"2014-04-22T19:39:11","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=8827"},"modified":"2014-04-22T12:39:11","modified_gmt":"2014-04-22T19:39:11","slug":"sunseeker-duo-makes-test-flights-december-17-earth-day","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/sunseeker-duo-makes-test-flights-december-17-earth-day\/","title":{"rendered":"Sunseeker Duo Makes Test Flights from December 17 to Earth Day"},"content":{"rendered":"<p><span style=\"line-height: 1.5em;\">Eric Raymond announced today that his <a href=\"www.solar-flight.com\">Sunseeker Duo<\/a>, the world\u2019s first solar-powered two-seat aircraft, has been making test flights since last December 17, the 111<\/span><sup style=\"line-height: 1.5em;\">th<\/sup><span style=\"line-height: 1.5em;\"> anniversary of the Wright Brothers\u2019 first flight.<\/span><\/p>\n<p><span style=\"line-height: 1.5em;\">The Duo was built by Eric and his wife Irena, and is Eric\u2019s third solar-powered airplane.\u00a0 His first, Sunseeker I, flew across the United States in 1990, making 21 hops from San Diego, California to Kitty Hawk, North Carolina.\u00a0 Sunseeker II flew from Friedrichshafen, Germany across the Alps to Italy, then toured around Europe.<\/span><\/p>\n<p>In Eric\u2019s announcement today, he claims that, \u201cThe Duo is the most advanced solar powered airplane in the world and the first that might be suited to production. It is also the first solar powered airplane with a passenger seat.\u201d<\/p>\n<p><iframe loading=\"lazy\" title=\"Sunseeker Duo test flights\" src=\"https:\/\/player.vimeo.com\/video\/92499008?dnt=1&amp;app_id=122963\" width=\"500\" height=\"281\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<p>\u201cSolar Flight\u2019s mission is to lead the way for the future of sport aviation using the most advanced technologies in the world. Irena says, \u2018We are working very hard to have the airplane tested and ready for passenger flights by this summer. No sight is more captivating than Earth from above. It will be even more beautiful from the cockpit of a solar powered airplane.\u2019\u201d<\/p>\n<p>The press release notes that, \u201cThe engineering challenges to build solar powered airplanes are formidable.\u201d\u00a0 With a 22-meter wing and an empty weight of 280 kilograms (Editor\u2019s note: 616 pounds \u2013 about 100 pounds lighter than the original J-3 Piper Cub), \u201cthe \u00a0structure must be incredibly light and aerodynamically efficient to perform well with only the power from integrated solar arrays. Because of the demanding requirements, solar powered airplanes have mostly been built as engineering novelties to break records or win prizes, rather than with the intent for practical use. The great triumph of the Sunseeker series is to integrate the huge number of conflicting design challenges into high performance, practical sport airplanes.\u201d<\/p>\n<p>With a 25 kilowatt (33.5 horsepower) motor, the Duo can \u201ccruise directly on solar power with two people on board and is capable of durations in excess of 12 hours. It uses a battery pack located in the fuselage to store energy harvested from the solar cells which line its wings and tail surfaces.\u201d<\/p>\n<div id=\"attachment_8828\" style=\"width: 538px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-Frame-grab-super-wide-turning.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8828\" class=\"size-large wp-image-8828\" alt=\"Sunseeker Duo over Voghera, Italy airfield, from which test flights are made\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-Frame-grab-super-wide-turning-528x298.jpg\" width=\"528\" height=\"298\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-Frame-grab-super-wide-turning-528x298.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-Frame-grab-super-wide-turning-300x169.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-Frame-grab-super-wide-turning.jpg 1920w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-8828\" class=\"wp-caption-text\">Sunseeker Duo over Voghera, Italy airfield, from which test flights are made<\/p><\/div>\n<p><span style=\"line-height: 1.5em;\">The low weight for a 72-foot wingspan airplane is astonishing, especially considering that it is essentially a sailplane, rugged enough to manage the thermals and turbulence of soaring flight.<\/span><\/p>\n<p>Eric managed a structural weight without motor and battery for the original Sunseeker I of around 100 pounds \u2013 again a bit incredible for a 45-foot wingspan craft.\u00a0 He\u2019s learned from that and Sunseeker II, making improvements in aerodynamics and structure, but also benefiting from new materials and technologies.<\/p>\n<p>Eric explains, \u201cThe lithium batteries today have seven times more capacity than the nickel cadmium batteries we used in Sunseeker I. When we first sketched the concept for this airplane, we couldn\u2019t imagine solar cells with greater than 20-percent efficiency. These technologies are a dream come true.\u201d \u00a0\u00a0The latest Sunseeker has 1,510 solar cells with 23-percent efficiency, that extra three percent is a significant notch in performance \u2013 a 13-percent boost over the best previous cells.<\/p>\n<div id=\"attachment_8829\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-over-church.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8829\" class=\"size-large wp-image-8829\" alt=\"A beautiful turnpoint.  Sunseeker Duo soars above church near Voghera, Italy\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-over-church-528x378.jpg\" width=\"528\" height=\"378\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-over-church-528x378.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-over-church-300x215.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-over-church.jpg 1157w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-8829\" class=\"wp-caption-text\">A beautiful turnpoint. Sunseeker Duo soars above church near Voghera, Italy<\/p><\/div>\n<p>Raymond reports testing the flying qualities, battery system performance, and all power systems \u2013 motor, propeller, and the folding hub mechanism.\u00a0 Landing gear retraction got a workout.<\/p>\n<p>Aerodynamically, Eric observed \u201csome instability in pitch, [so] more area and additional solar cells were added to the horizontal stabilizer. Now the airplane is docile with good control authority in the air and on the ground. The performance is better than the previous airplane in every category; operations are easier because the landing gear and systems are more conventional; and the airplane has enough excess power to carry a passenger and baggage.\u201d<\/p>\n<div id=\"attachment_8830\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-takeoff.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8830\" class=\"size-large wp-image-8830 \" alt=\"\" src=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-takeoff-528x352.jpg\" width=\"528\" height=\"352\" srcset=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-takeoff-528x352.jpg 528w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-takeoff-300x200.jpg 300w, http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-takeoff.jpg 1500w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/a><p id=\"caption-attachment-8830\" class=\"wp-caption-text\">Sunseeker Duo on takeoff showing off substantial landing gear, camera mount for extraordinary views of airplane in flight<\/p><\/div>\n<p>As one would guess, flight on sunlight like flight in a conventional lightplane. \u201cFlying a solar powered airplane really can\u2019t be compared to anything else, it\u2019s totally unique,\u201d according to Eric Lentz-Gauthier, one of the pilots of the original Sunseeker. \u201cIn sailplanes you are usually stuck under the clouds and in conventional airplanes you have terribly noisy cockpits. In both you have a sense of urgency about energy that detracts from the experience. In a solar powered airplane, you fly on top of the clouds. The horizon looks a little different when you\u2019re flying with an unlimited supply of free energy. That\u2019s what I\u2019m most excited about with the new airplane &#8211; sharing this experience, it changes you.\u201d<\/p>\n<p>On this Earth Day, we can only hope for more such changing experiences for all of us.<\/p>\n<div id=\"facebook_like\"><iframe src=\"http:\/\/www.facebook.com\/plugins\/like.php?href=http%3A%2F%2Fcafe.foundation%2Fblog%2Fsunseeker-duo-makes-test-flights-december-17-earth-day%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>Eric Raymond announced today that his Sunseeker Duo, the world\u2019s first solar-powered two-seat aircraft, has been making test flights since last December 17, the 111th anniversary of the Wright Brothers\u2019 first flight. The Duo was built by Eric and his wife Irena, and is Eric\u2019s third solar-powered airplane.\u00a0 His first, Sunseeker I, flew across the [&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":[4987,159,2854,2858,2855,160,161,3478],"class_list":["post-8827","post","type-post","status-publish","format-standard","category-electric_powerplants","category-sustainable_ga","tag-eric-lentz-gauthier","tag-eric-raymond","tag-irena-raymond","tag-solar-flight-com","tag-sunseeker-duo","tag-sunseeker-i","tag-sunseeker-ii","tag-voghera-italy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sunseeker Duo Makes Test Flights from December 17 to Earth Day - 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\/sunseeker-duo-makes-test-flights-december-17-earth-day\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sunseeker Duo Makes Test Flights from December 17 to Earth Day - CAFE Foundation Blog\" \/>\n<meta property=\"og:description\" content=\"Eric Raymond announced today that his Sunseeker Duo, the world\u2019s first solar-powered two-seat aircraft, has been making test flights since last December 17, the 111th anniversary of the Wright Brothers\u2019 first flight. The Duo was built by Eric and his wife Irena, and is Eric\u2019s third solar-powered airplane.\u00a0 His first, Sunseeker I, flew across the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"http:\/\/cafe.foundation\/blog\/sunseeker-duo-makes-test-flights-december-17-earth-day\/\" \/>\n<meta property=\"og:site_name\" content=\"CAFE Foundation Blog\" \/>\n<meta property=\"article:published_time\" content=\"2014-04-22T19:39:11+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/cafe.foundation\/blog\/wp-content\/uploads\/2014\/04\/sunseeker-duo-Frame-grab-super-wide-turning-528x298.jpg\" \/>\n<meta name=\"author\" content=\"Dean Sigler\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dean Sigler\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/#article\",\"isPartOf\":{\"@id\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/\"},\"author\":{\"name\":\"Dean Sigler\",\"@id\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/#\\\/schema\\\/person\\\/e9c06a89f78d39fc03473ec90f4902a7\"},\"headline\":\"Sunseeker Duo Makes Test Flights from December 17 to Earth Day\",\"datePublished\":\"2014-04-22T19:39:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/\"},\"wordCount\":818,\"commentCount\":2,\"image\":{\"@id\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/wp-content\\\/uploads\\\/2014\\\/04\\\/sunseeker-duo-Frame-grab-super-wide-turning-528x298.jpg\",\"keywords\":[\"Eric Lentz-Gauthier\",\"Eric Raymond\",\"Irena Raymond\",\"Solar-flight.com\",\"Sunseeker Duo\",\"Sunseeker I\",\"Sunseeker II\",\"Voghera Italy\"],\"articleSection\":[\"Electric Powerplants\",\"Sustainable Aviation\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/\",\"url\":\"http:\\\/\\\/cafe.foundation\\\/blog\\\/sunseeker-duo-makes-test-flights-december-17-earth-day\\\/\",\"name\":\"Sunseeker Duo Makes Test Flights from December 17 to Earth Day - 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