{"id":14079,"date":"2021-06-09T22:26:34","date_gmt":"2021-06-10T05:26:34","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=14079"},"modified":"2021-06-09T22:26:34","modified_gmt":"2021-06-10T05:26:34","slug":"two-similar-estols","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/two-similar-estols\/","title":{"rendered":"Two Similar eSTOLs"},"content":{"rendered":"<p>Two different but very similar electric Short Take Off and Landing (eSTOL) aircraft from two different companies are making progress toward realization.\u00a0 Both are products of teams originally committed to electric Vertical Take Off and Landing (eVTOL) designs, so the shift to different configurations is of interest.\u00a0 eVTOLs are limited in range by the need to lift their entire weight on their rotors \u2013 some for the totality of the flight.\u00a0 eSTOLs use aerodynamics to enable longer range, and with high-lift devices, can use small fields from which to operate.<\/p>\n<div id=\"attachment_16590\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/pocket-airpark-1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16590\" class=\"wp-image-16590\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/pocket-airpark-1-528x383.jpg\" alt=\"\" width=\"600\" height=\"435\" \/><\/a><p id=\"caption-attachment-16590\" class=\"wp-caption-text\">Pocket airpark could fit in city block, enable neighborhood access to eSTOL flights<\/p><\/div>\n<p>Dr. Brien Seeley, head of the Sustainable Aviation Foundation, has been a long-time proponent of what he called \u201cpocket airparks.\u201d\u00a0 These neighborhood or urban sites would be contained within roughly one-block perimeters, use aircraft capable of extremely short takeoffs and landings, low noise, and quick turnarounds.\u00a0 Electric aircraft and their quiet operation would allow placing such airparks in more areas and could make access to air travel as common as hopping on a local bus.<\/p>\n<h4><strong>\u201cAirflow and Ravn Alaska Ink Deal for 50 Carbon-Neutral eSTOL Aircraft\u201d<\/strong><\/h4>\n<p>Ravn Alaska currently flies DeHavilland Dash 8s, 37-passenger twin turboprops.\u00a0 Service to their dozen destinations is somewhat irregular, probably because filling the airplane for flights to such isolated locations would be spotty at best.\u00a0 Smaller eSTOLs will enable greater flexibility, the airline noting the advantages. \u00a0\u201cRavn will benefit from lower operating costs, reduced noise signatures, and increased routes with new aircraft using electric propulsion technology.\u201d<\/p>\n<p><iframe loading=\"lazy\" title=\"Airflow - Auto | Mobility Tech 6\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/-J1fMTQItSM?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 enable that greater flexibility,<a href=\"https:\/\/www.airflow.aero\/\"> Airflow Aero<\/a> announced a letter of intent with Ravn to supply 50 eSTOL aircraft.\u00a0 Airflow now has over $200 million in orders.\u00a0 This will enable Ravn to better serve its customers, according to CEO Rob McKinney.\u00a0 \u201cAs a regional operator, we are committed to serving the many large and small communities of Alaska. That means we are constantly seeking out new ways to deliver the best value and experience for Alaskans. \u00a0With Airflow, we benefit from the new capabilities the aircraft offers that open up new and different destinations, the constantly improving efficiencies of electrification, and alignment between our fleet and the rising demands of our customers to travel with the smallest carbon footprint possible.\u201d<\/p>\n<div id=\"attachment_16592\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/airflow-in-ravn-livery.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16592\" class=\"wp-image-16592\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/airflow-in-ravn-livery-528x351.jpg\" alt=\"\" width=\"600\" height=\"399\" \/><\/a><p id=\"caption-attachment-16592\" class=\"wp-caption-text\">Airflow in Ravn livery, cargo configuration<\/p><\/div>\n<p>The eight-motor, single-pilot, seven-passenger aircraft will be able to fly from the shortest runways and with enough range to serve all of Ravn&#8217;s remote destinations.\u00a0 It will also be able to carry enough cargo to be useful in supplying those destination.<\/p>\n<div id=\"attachment_16586\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/airflow-Ravn-heads.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16586\" class=\"wp-image-16586\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/airflow-Ravn-heads-528x297.jpg\" alt=\"\" width=\"600\" height=\"338\" \/><\/a><p id=\"caption-attachment-16586\" class=\"wp-caption-text\">Tom Hsieh,President of Ravn Alaska, and Marc Ausman, CEO of Airflow move aviation into the future<\/p><\/div>\n<p>Marc Ausman, CEO and co-founder of Airflow, adds, \u201cAt Airflow, we\u2019re partnering with companies that seek to add new aircraft with new capabilities to their fleets that are flexible, cost-effective, and carbon-neutral.\u201d\u00a0 Because of their STOL capabilities, Airflow\u2019s craft need no new infrastructure and present few \u201churdles\u201d to certification.\u00a0 Their hybrid power system enables long enough endurance to serve all of Ravn\u2019s existing routes.\u00a0 \u201cFuture aircraft models from Airflow will feature autonomous systems to further improve cost efficiency and safety.\u201d\u00a0 These will include a system dubbed a \u201cVirtual Tailhook,\u201d something tested on a scale model and soon on a Cessna 210 demonstrator.\u00a0 This will enable pilots to \u201cnail\u201d landings as though they had snagged arresting cables across a flight deck.<\/p>\n<h4><strong>Electra.Aero\u2019s First Commercial Product <\/strong><\/h4>\n<p><a href=\"https:\/\/c212.net\/c\/link\/?t=0&amp;l=en&amp;o=3188809-1&amp;h=2665030311&amp;u=http%3A%2F%2Fwww.electra.aero%2F&amp;a=Electra.aero\">Electra.aero<\/a> unveiled its first commercial product to serve regional air mobility markets. Like the Airflow eSTOL, it\u2019s, \u201cDesigned to carry up to seven passengers and a pilot as far as 500 miles while operating out of areas shorter than a soccer field, including rooftops and parking lots. Electra&#8217;s \u2018blown lift\u2019 technology \u2013 where the electric motor-driven propellers blow air over the entire span of the wing and its flaps \u2013 allows safe, energy-efficient takeoff and landings at speeds below 30 mph while cruising at high-speeds of 200 mph.\u201d<\/p>\n<p>\u201cBlown lift,\u201d according to electra.aero\u2019s web site, \u201cis a special aerodynamic technique that tricks the wing into thinking it&#8217;s much bigger than it really is. It&#8217;s been used in other niche markets in the past but combined with distributed electric propulsion, blown lift is now super efficient and practical for wider applications.\u201d<\/p>\n<p>Coming on the end of John Langford\u2019s previous eVTOL project, <a href=\"https:\/\/www.futureflight.aero\/news-article\/2020-11-06\/electra-takes-short-takeoff-and-landing-path-advanced-air-mobility\">Electra.aero\u2019s new machine<\/a> is a product of realizations about vertical flight.\u00a0 \u201cIn all the work we did on eVTOL aircraft, I kept coming up with answers about the cost that showed that very short takeoff and landing concepts would have significantly lower costs, and that actual vertical takeoff and landing performance is only required in a narrow set of circumstances and that in most locations space [for STOL operations] is available.\u201d<\/p>\n<div id=\"attachment_16588\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/Electra_aero-eSTOL-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-16588\" class=\"wp-image-16588\" src=\"http:\/\/sustainableskies.org\/wp-content\/uploads\/2021\/06\/Electra_aero-eSTOL-528x269.jpg\" alt=\"\" width=\"600\" height=\"306\" \/><\/a><p id=\"caption-attachment-16588\" class=\"wp-caption-text\">&#8220;Electra&#8217;s hybrid-electric super-short takeoff and landing aircraft shown here has a wingspan of 48 feet and carries up to seven passengers plus a pilot. The aircraft has 8 electric propellers driven by a hybrid-electric powerplant. This allows the plane to operate out of soccer fields and other constrained spaces like rooftops and parking lots while flying at ranges up to 500 miles. The aircraft is planned to enter commercial service by 2027.&#8221;\u00a0 Electra.Aero caption<\/p><\/div>\n<p>The single-pilot aircraft\u2019s eight electric motors are powered by a combination of batteries and a small, quiet turbogenerator.\u00a0 This means the aircraft does not need to rely on a special charging infrastructure \u2013 the batteries are recharged mid-air. Because the airplane carries a smaller battery pack than an eVTOL of similar performance and capacity, Electra&#8217;s aircraft provides more room for passengers and cargo.\u00a0 This results in superior operating economics and minimizes energy consumption.<\/p>\n<p>As with Airflow\u2019s early trials, Electra.aero will rely on a \u201ctechnology demonstrator.\u201d\u00a0 To evaluate \u201coptimum short-field performance,\u201d the sub-scale demonstrator will array eight 30 kilowatt (40.2 horsepower) along the leading edge of the wing, and charge batteries with a 100 kilowatt (134 horsepower) engine.\u00a0 Propellers will be \u201cslow spinning, non-variable pitch.\u201d\u00a0 Of course, the full-scale aircraft will have a more powerful system.\u00a0 Langford even sees future possibilities of a 40-passenger model for inter-urban travel.<\/p>\n<p>The initial design could support, \u201cA variety of advanced air mobility missions, including air taxi operations, freight delivery, and logistics in urban, suburban, and rural environments. Its fixed landing gear is being designed for use on unprepared landing strips.\u201d\u00a0 As your editor has noted before, this would be a great deal like William T. Piper\u2019s vision of a network regional airports, simple strips serving small towns and village in a more rural setting.<\/p>\n<p>Two companies, both changing direction from eVTOLs to eSTOLs make for an interesting vision of rooftop airports and neighborhoods landing zones.\u00a0 This would certainly make air transport more accessible to millions.<\/p>\n<div id=\"facebook_like\"><iframe src=\"http:\/\/www.facebook.com\/plugins\/like.php?href=http%3A%2F%2Fcafe.foundation%2Fblog%2Ftwo-similar-estols%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>Two different but very similar electric Short Take Off and Landing (eSTOL) aircraft from two different companies are making progress toward realization.\u00a0 Both are products of teams originally committed to electric Vertical Take Off and Landing (eVTOL) designs, so the shift to different configurations is of interest.\u00a0 eVTOLs are limited in range by the need [&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":[7568,6862,15,6894,8173,14],"tags":[10079,10564,10806,38,10807,9052,4091,10082,6468,10808,10809,9238,10810,7842],"class_list":["post-14079","post","type-post","status-publish","format-standard","category-announcements","category-batteries","category-electric_powerplants","category-hybrid-aircraft","category-sky-taxis","category-sustainable_ga","tag-airflow","tag-airflow-aero","tag-dehavilland-dash-8","tag-dr-brien-seeley","tag-estol-electric-short-take-off-and-landing","tag-evtol-electric-vertical-take-off-and-landing","tag-john-langford","tag-marc-ausman","tag-pocket-airparks","tag-ravn-alaska","tag-rob-mckinney","tag-sustainable-aviation-foundation","tag-tom-hsieh","tag-william-t-piper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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