{"id":235673,"date":"2015-06-29T21:03:00","date_gmt":"2015-06-29T21:03:00","guid":{"rendered":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg"},"modified":"2023-03-17T14:25:04","modified_gmt":"2023-03-17T18:25:04","slug":"where-are-they-now-f-18-high-alpha-research-vehicle-harv","status":"inherit","type":"attachment","link":"https:\/\/www.nasa.gov\/image-detail\/where-are-they-now-f-18-high-alpha-research-vehicle-harv\/","title":{"rendered":"Where Are They Now: F\/A-18 High Alpha Research Vehicle (HARV)"},"author":9,"comment_status":"closed","ping_status":"closed","template":"","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"nasa_hds_core_meta_video_cc_file_id":"","nasa_hds_core_meta_audio_cc_file_id":""},"media-tags":[10822],"read_time":1,"video_cc_url":"","audio_cc_url":"","credits":"","original_date":{"stamp":0,"display":""},"description":{"rendered":"<p class=\"attachment\"><a href='https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"235\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"Flow visualization smoke marks vortex flows along the leading edge extension on an F\/A-18\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg 1041w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?resize=300,235 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?resize=768,601 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?resize=1024,801 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?resize=400,313 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?resize=600,469 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?resize=900,704 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>NASA’s Dryden Flight Research Center, Edwards, CA, used an F-18 Hornet fighter aircraft as its High Angle-of-Attack (Alpha) Research Vehicle (HARV) in a three-phased flight research project lasting from April 1987 until September 1996. The aircraft completed 385 research flights and demonstrated stabilized flight at angles of attack between 65 and 70 degrees using thrust vectoring vanes, a research flight control system, and (eventually) forebody strakes (hinged structures on the forward side of the fuselage to provide control by interacting with vortices, generated at high angles of attack, to create side forces).<\/p>\n<p>This combination of technologies provided carefree handling of a fighter aircraft in a part of the flight regime that was otherwise very dangerous. Flight research with the HARV increased our understanding of flight at high angles of attack, enabling designers of U.S. fighter aircraft to design airplanes that will fly safely in portions of the flight envelope that pilots previously had to avoid…<a href=\"\/centers\/armstrong\/news\/FactSheets\/FS-002-DFRC.html\">Learn more<\/a><\/p>\n<p>F\/A-18 HARV #840 is now on display at the <a href=\"http:\/\/www.vasc.org\/visit\/exhibits\/aircraft\" rel=\"noopener\">Virginia Air and Space Center<\/a> in Hampton, Virginia.<\/p>\n"},"caption":{"rendered":"<p>NASA’s Dryden Flight Research Center, Edwards, CA, used an F-18 Hornet fighter aircraft as its High Angle-of-Attack (Alpha) Research Vehicle (HARV) in a three-phased flight research project lasting from April 1987 until September 1996.<\/p>\n"},"alt_text":"Flow visualization smoke marks vortex flows along the leading edge extension on an F\/A-18","media_type":"image","mime_type":"image\/jpeg","media_details":{"width":1041,"height":814,"file":"2023\/03\/309895main_EC89-0096-149_full.jpg","filesize":71388,"sizes":{"thumbnail":{"file":"309895main_EC89-0096-149_full.jpg?resize=150,150","width":150,"height":150,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=150&h=150&crop=1"},"medium":{"file":"309895main_EC89-0096-149_full.jpg?resize=300,235","width":300,"height":235,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=300"},"medium_large":{"file":"309895main_EC89-0096-149_full.jpg?resize=768,601","width":768,"height":601,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=1024"},"large":{"file":"309895main_EC89-0096-149_full.jpg?resize=1024,801","width":1024,"height":801,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=1024"},"thumbnail-sm":{"file":"309895main_EC89-0096-149_full.jpg?resize=50,50","width":50,"height":50,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=50&h=50&crop=1"},"thumbnail-md":{"file":"309895main_EC89-0096-149_full.jpg?resize=100,100","width":100,"height":100,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=100&h=100&crop=1"},"thumbnail-lg":{"file":"309895main_EC89-0096-149_full.jpg?resize=200,200","width":200,"height":200,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=200&h=200&crop=1"},"card-xsm":{"file":"309895main_EC89-0096-149_full.jpg?resize=400,313","width":400,"height":313,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=400"},"card-sm":{"file":"309895main_EC89-0096-149_full.jpg?resize=600,469","width":600,"height":469,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=600"},"card-md":{"file":"309895main_EC89-0096-149_full.jpg?resize=900,704","width":900,"height":704,"filesize":71388,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg?w=900"},"full":{"file":"309895main_EC89-0096-149_full.jpg","width":1024,"height":801,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg"}},"image_meta":{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0","keywords":[]},"credits":"","original_date":{"stamp":0,"display":""}},"post":null,"source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/309895main_EC89-0096-149_full.jpg","_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/235673"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/attachment"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/9"}],"wp:term":[{"taxonomy":"media-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media-tags?post=235673"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}