{"id":13905,"date":"2021-01-17T22:57:58","date_gmt":"2021-01-18T05:57:58","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=13905"},"modified":"2021-01-18T21:44:23","modified_gmt":"2021-01-19T04:44:23","slug":"stemme-goes-electric-with-its-new-elfin","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/stemme-goes-electric-with-its-new-elfin\/","title":{"rendered":"Stemme Goes Electric with its New Elfin"},"content":{"rendered":"<p>Reiner Stemme designed his namesake sailplane 30 years ago and the overall design and his new Elfin retains the original pop-out nose cone, folding propeller configuration.\u00a0 The 50:1 glide ratio means this 20-meter (75-foot) span motorglider offers less than 40 pounds of drag at its maximum takeoff weight 0f 1984 pounds.\u00a0 That is a significant benefit for the new electrically-powered version \u2013 which can fly further and save its batteries for retrieval and go-arounds.<\/p>\n<p><iframe loading=\"lazy\" title=\"Stemme S10\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/EbEl-49Ra_4?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 its latest iteration, the Stemme configuration is a totally new airframe being built by a totally new company, <a href=\"http:\/\/www.reinerstemme.aero\/\">Reiner Stemme Aero GmbH<\/a>.\u00a0 As explained on the new firm\u2019s web site, \u201cThe Elfin design is a complete new development and [is] not base[d] upon the existing S10. \u00a0REINERSTEMME.aero GmbH, the present company of Dr. Reiner Stemme, is not connected to STEMME AG.\u201d<\/p>\n<h4><strong>A High-Flying Heritage<\/strong><\/h4>\n<p>Earlier Stemme designs have accomplished much in the way of efficient, high-performance flight.\u00a0 <a href=\"http:\/\/cafe.foundation\/blog\/eas-viii-klaus-ohlmann-conquers-everest\/\">In 2014, Klauss Ohlman accomplished one trans-continental trip from Europe to Asia, followed by the surmounting of Mount Everest in an SV-10T<\/a>.<\/p>\n<p>That accomplishment is recounted even in the new company\u2019s web site. \u201cA highlight in its history was the successful mission \u201cOn Top of the World\u201d in the Himalaya region using an underwing 3D camera system from DLR. We have the ambitious objective to continue this story in a new generation of planes; therein we rely on radical innovations. We cooperate with German research institutes and the industry \u2013 so we can best incorporate today\u2019s knowledge in this project.\u201d<\/p>\n<p><iframe loading=\"lazy\" title=\"Mit dem Motorsegler im Himalaya (Lange Version)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/-IwyYrqefrU?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>New Name, New Propulsion<\/strong><\/h4>\n<p>The REINER STEMME elfin 20.e name represents the 20-meter (75-foot) wing and its electric (e) power system.\u00a0 A further refinement, the \u201cex,\u201d has a range extender that will allow flights up to six hours and 1,000 kilometers (540 miles) under power.<\/p>\n<p>Elfin\u2019s battery system, with 21 kilowatt-hours nominal value can provide a flight profile that uses four kWh for three minutes of taxiing and a take-off and climb to 500 meters (1,600 feet).\u00a0 It could then, on the same charge, fly level for an hour at 130 kilometers per hour (70 knots or 80.5 mph) on another 12 kWh.\u00a0 70 knots is Elfin\u2019s best glide ratio.\u00a0 A climb to 3,000 meters (10,000 feet) would require 16 kWh.<\/p>\n<div id=\"attachment_15872\" style=\"width: 614px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/01\/stemme-elfin-siemens-power-system.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15872\" class=\"wp-image-15872\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/01\/stemme-elfin-siemens-power-system-528x453.jpg\" alt=\"\" width=\"604\" height=\"519\" \/><\/a><p id=\"caption-attachment-15872\" class=\"wp-caption-text\">Nose-mounted Siemens motor simplifies power train of gas-powered Stemmes, eliminating propeller shaft that ran through cockpit<\/p><\/div>\n<p>The liquid-cooled Siemens motor can produce 72 kW peak (96.5 hp) and 55 kW continuous (73.75 hp).\u00a0 Two 60-kilogram (132-pound) 600 Volt battery packs of three modules each sit behind the cockpit.\u00a0 Stemme expects 1,000 full cycles from the packs, which can be replaced at a cost of 18,000 euros ($21,700).\u00a0 With at least 1,000 hours of flight from each cycle, and more in soaring mode, cost of operations would be under $20.00 per hour.<\/p>\n<div id=\"attachment_15873\" style=\"width: 614px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/01\/stemme_rangeextender_vorab2_9ce8548228-1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15873\" class=\"wp-image-15873\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/01\/stemme_rangeextender_vorab2_9ce8548228-1-528x272.jpg\" alt=\"\" width=\"604\" height=\"311\" \/><\/a><p id=\"caption-attachment-15873\" class=\"wp-caption-text\">Elfin range extender allows up to 1,000 kilometer flights under power<\/p><\/div>\n<p>For those wanting a longer mission profile, the Elfin can be fitted with an auxiliary range extender. The 60 kilogram (132 pound) under-wing mounted internal combustion engine and generator setup can deliver 30-35 kW continuously.\u00a0 At a normal cruise of 185 km\/hr (100 knots or 115 mph) at 10,000 feet, the Elfin can carry its two passengers 1,000 kilometers, or 540 nautical miles \u2013 roughly six hours endurance.\u00a0 Fuel is carried in the center wing and the pod carrying the engine\/generator can be mounted or demounted by a single person with a \u201crigging aid.\u201d\u00a0 In operation, a single on\/off switch enables or disables the range extender.<\/p>\n<h4><strong>Comfort and Safety<\/strong><\/h4>\n<p><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/01\/Stemme-Elfin_Cockpit_Final_2_neu_318e46d393.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-15875\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/01\/Stemme-Elfin_Cockpit_Final_2_neu_318e46d393-528x297.jpg\" alt=\"\" width=\"604\" height=\"340\" \/><\/a><\/p>\n<p>Pilot and passenger share a wide side-by-side cockpit in front of the wing.\u00a0 A centrally-mounted instrument cluster and single-lever power control makes operation simple.\u00a0 A directly-coupled Siemens motor in the fuselage nose turns the folding propeller which neatly tucks in behind a retractable nose cone.\u00a0 (Current versions use a manual extension\/retraction handle, but Stemme says the electric version has automatic operation.)\u00a0 Your editor has been astounded at how easily the small-diameter prop pulls a large Stemme into the air.<\/p>\n<p><iframe loading=\"lazy\" title=\"STEMME S10  - Amazing\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/AX4QHwTBhSA?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>Reiner Stemme has designed a \u201cspecific wing airfoil 20e-143 without premature lift plateau, seamlessly optimized over the entire wing span.\u201d\u00a0 Their long center section, fixed to the fuselage, avoids the problem of separate wings which plug in and have to be taped along their chord to avoid extra drag.\u00a0 What the company describes as an \u201cambitious wing-to-fuselage-intersection design with fillets for drag reduction\u201d is meant to overcome at least some of the drag from aerodynamic interference between joining components.\u00a0 Outer wing sections pivot and allow the large craft to be stored in a conventional hangar.<\/p>\n<p>If all were to go wrong (an unlikely event) the Elfin can be lowered safely be a whole-airplane ballistic parachute.\u00a0 As an indication that authorities are betting that won\u2019t happen, Elfin can be certified under EASA (European Aviation Safety Administration) or FAA equivalent rules.<\/p>\n<p>We look forward to seeing this latest example of Reiner Stemme\u2019s creativity in the air soon.<\/p>\n<div id=\"facebook_like\"><iframe src=\"http:\/\/www.facebook.com\/plugins\/like.php?href=http%3A%2F%2Fcafe.foundation%2Fblog%2Fstemme-goes-electric-with-its-new-elfin%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>Reiner Stemme designed his namesake sailplane 30 years ago and the overall design and his new Elfin retains the original pop-out nose cone, folding propeller configuration.\u00a0 The 50:1 glide ratio means this 20-meter (75-foot) span motorglider offers less than 40 pounds of drag at its maximum takeoff weight 0f 1984 pounds.\u00a0 That is a significant [&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":[7568,6862,15,6894,14],"tags":[10510,10511,4113,10512,10513],"class_list":{"0":"post-13905","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-announcements","7":"category-batteries","8":"category-electric_powerplants","9":"category-hybrid-aircraft","10":"category-sustainable_ga","11":"tag-klauss-ohlman","12":"tag-mountain-wave-project","13":"tag-range-extender","14":"tag-reiner-stemme","15":"tag-stemme-rs20-elfin"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - 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