{"id":14178,"date":"2021-08-20T23:16:32","date_gmt":"2021-08-21T06:16:32","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=14178"},"modified":"2021-08-20T23:16:32","modified_gmt":"2021-08-21T06:16:32","slug":"pie-aeronefs-ur-1-v-tailed-battery-winged-racer","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/pie-aeronefs-ur-1-v-tailed-battery-winged-racer\/","title":{"rendered":"Pie Aeronefs UR-1: V-tailed, Battery-winged Racer"},"content":{"rendered":"<p>Pie Aeronefs, a small team of dedicated builders in Switzerland is putting the finishing touches on the UR-1, a V-tailed, battery-winged electric racer expected to fly in next Air Race E series.<\/p>\n<p><em><a href=\"https:\/\/pieaeronefs.ch\/en\/news\/a-propos-laube-du-premier-avion-de-course-suisse-100-electrique\/\">\u201cMarc Umbricht&#8217;s vision<\/a> is to create a 4-seater general aviation electric aircraft that shall equal or surpass the performances of standard piston engine aeroplanes. This new generation aircraft will bring a viable and sustainable alternative on the <a href=\"https:\/\/en.wikipedia.org\/wiki\/General_aviation\">general aviation<\/a> market.\u201d<\/em><\/p>\n<p><iframe loading=\"lazy\" title=\"Building an electric aircraft | Fuselage mock-up\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/APOAZQisIxM?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>To achieve this ultimate goal, the Pie Aeronefs team has a series of iterative designs to explore, starting with a single-seat eRacer.\u00a0 The small aircraft development firm in La Sarraz, Switzerland is on track to complete the airframe of its UR-1 Air Race E machine soon.<\/p>\n<h4><strong>12 Battery Packs<\/strong><\/h4>\n<p>Innovative in the extreme, the small craft will store <a href=\"https:\/\/pieaeronefs.ch\/en\/news\/batteries\/\">12 in-series 10-kilogram (22-pound) battery packs<\/a> in its wings.\u00a0 Each 55-Volt pack stores 1.15 kilowatt hours of electricity.<\/p>\n<p><iframe loading=\"lazy\" title=\"How to design an aircraft | Interview with Marc Umbricht\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/9KcCrsjz1Hk?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>The 13-member team chose lithium-ion polymer cells for their battery packs because they offer, \u201cThe best balance between power output and safety, despite the fire risks inherently found in Lithium-ion batteries.\u201d \u00a0To protect the batteries and distribute their weight across the wing\u2019s span, the group <a href=\"https:\/\/www.electric-flight.eu\/#xl_xr_page_index\">built a wing \u201cwith appropriate rigidity<\/a>, as a flexible wing may damage the batteries.\u201d\u00a0 They\u2019ve also designed \u201can original battery fire protection system in addition to a liquid cooling system.\u201d\u00a0 Stay tuned for more on this feature.\u00a0 Part of that may come from the basalt fiber containers in which the batteries are ensconced.<\/p>\n<div id=\"attachment_16922\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/08\/pie-aeronefs-batteries-in-wing.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16922\" class=\"wp-image-16922\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/08\/pie-aeronefs-batteries-in-wing-528x243.jpg\" alt=\"\" width=\"600\" height=\"276\" \/><\/a><p id=\"caption-attachment-16922\" class=\"wp-caption-text\">UR-1&#8217;s battery packs, six in series in each wing, provide short-duration, high-output burst of power<\/p><\/div>\n<p>Heat loss from the electric motor, controller, and other electronics will be dissipated through radiator plates on the inner skin of the fuselage.\u00a0 This is similar to the radiator tubes that ran down the sides of the Supermarine S5 and S6 Schneider Cup racers in the 1930s.<\/p>\n<div id=\"attachment_16928\" style=\"width: 538px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/08\/Pie-aeronef-supermarine.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16928\" class=\"size-large wp-image-16928\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/08\/Pie-aeronef-supermarine-528x297.jpg\" alt=\"\" width=\"528\" height=\"297\" \/><\/a><p id=\"caption-attachment-16928\" class=\"wp-caption-text\">Supermarine S5 was predecessor of Spitfire, WWII fighter. Tubes running along fuselage cooled engine, much like inner skin on UR-1 cools the motor<\/p><\/div>\n<p><strong>One Emrax Motor<\/strong><\/p>\n<p>All that stored energy will be fed to an Emrax 12-inch diameter motor weighing 40 kilograms (88 pounds), putting out 150 kilowatts (203 horsepower).\u00a0 That\u2019s projected to be enough to pull the 400 kilogram (880 pounds) maximum weight UR-1 around the pylons at up to 302 knots (560 kilometers per hour or 348 mph).\u00a0 Racing four laps around the Air Race E course will probably see lower speeds because of the high G-force turns.\u00a0 The projected 90 kilogram (198 pound) pilot will be subjected to those forces 16 to 20 times during a quick, intense race.<\/p>\n<p><iframe loading=\"lazy\" title=\"The Air Race Circuit | 3D Model\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Fi68iL2syR4?start=5&#038;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<h4><strong>Fixed Gear and V Tail<\/strong><\/h4>\n<p>UR-1 has a fixed landing gear in accordance with the rules, and slotted flaps to slow things down for take-offs and landings.<\/p>\n<p>The V tail is an approach to reducing interference drag, that part of the drag profile that comes from wings butting up against the fuselage, for instance, and tail surfaces interfering with each others\u2019 airflows.\u00a0 Eliminating one part and making the remaining two perform all functions simplified the airflow, but makes it a little harder to manage the stresses on the tail cone.\u00a0 That may be why UR-1 has a fairly thick protrusion \u2013 looking a bit like what ornithologists call <a href=\"https:\/\/www.scienceworld.ca\/stories\/ever-wonder-about-popes-nose\/\">the \u201cPope\u2019s nose\u201d on a bird.<\/a>\u00a0 (Your editor is not making that up.)\u00a0 Much like the aircraft, the bird may need that for structural reasons, all the tail feathers poking out from the bulbous posterior and needing muscles to move them appropriately.<\/p>\n<p><iframe loading=\"lazy\" title=\"How to design aircraft parts | Interview with Oliver Ensslin\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/4ZBgqcqcPPU?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<h4><strong>Certification<\/strong><\/h4>\n<p>On June 18, 2021, the <a href=\"https:\/\/www.experimental.ch\/\">EAS (Experimental Aviation of Switzerland)<\/a> association approved the <a href=\"https:\/\/pieaeronefs.ch\/en\/news\/avion-ur-1\/\">UR-1<\/a> project. a crucial step to permit the first Swiss all-electric race plane to fly.<\/p>\n<p><iframe loading=\"lazy\" title=\"Manufacturing aircraft parts in composite | Interview with Fabrice Allaz\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/nV8LH5fpQSY?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>In Switzerland, EAS offers support and help to every project in the experimental aviation field. According to Pia Aeronef, \u201cThey work with the <a href=\"https:\/\/www.bazl.admin.ch\/bazl\/en\/home.html\">FOCA (Federal Office of Civil Aviation)<\/a> and are in charge of the supervision of the construction and the maintenance of self-built planes. The EAS association is actually managing the development of more than 130 aircrafts.\u201d<\/p>\n<h4><strong>Future Plans<\/strong><\/h4>\n<p>UR-1 is a simple, straightforward design compared to what Marc Umbricht has envisioned for the future.\u00a0 Following, if all goes well, could be UR-2, a distributed electric propulsion (DEP) race plane.\u00a0 That would give way to the UG-3, a certified electric General Aviation craft capable of flying 500 nautical miles at 120 knots indicated air speed.\u00a0 It could land and take off in 500 meters (1,640 feet).\u00a0 Finally, Umbricht foresees the UB-4, a long-range short takeoff and landing (STOL) business jet with a 6,000 NM range, cruise of Mach 0.8 (613 mph!), and a 900-meter (2,952-feet) takeoff and landing distance.<\/p>\n<p>It\u2019s nice to see an enthusiastic group keeping a timeline and their ambitions on track.\u00a0 We wish them well and safe racing.<\/p>\n<div id=\"facebook_like\"><iframe src=\"http:\/\/www.facebook.com\/plugins\/like.php?href=http%3A%2F%2Fcafe.foundation%2Fblog%2Fpie-aeronefs-ur-1-v-tailed-battery-winged-racer%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>Pie Aeronefs, a small team of dedicated builders in Switzerland is putting the finishing touches on the UR-1, a V-tailed, battery-winged electric racer expected to fly in next Air Race E series. \u201cMarc Umbricht&#8217;s vision is to create a 4-seater general aviation electric aircraft that shall equal or surpass the performances of standard piston engine [&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":[6862,15,14],"tags":[8508,7946,1239,10965,10966,10967,10968,10969,10970,10971,10972,10973],"class_list":["post-14178","post","type-post","status-publish","format-standard","category-batteries","category-electric_powerplants","category-sustainable_ga","tag-air-race-e","tag-eas-experimental-aviation-of-switzerland","tag-emrax-motor","tag-foca-federal-office-of-civil-aviation","tag-marc-umbricht","tag-pia-aeronefs","tag-pia-aeronefs-ub-4","tag-pia-aeronefs-ug-3","tag-pia-aeronefs-ur-1","tag-pia-aeronefs-ur-2","tag-supermarine-s5","tag-supermarine-s6"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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