{"id":6046,"date":"2016-10-21T16:12:06","date_gmt":"2016-10-21T21:12:06","guid":{"rendered":"http:\/\/huewhite.com\/umb\/?p=6046"},"modified":"2016-10-21T16:12:44","modified_gmt":"2016-10-21T21:12:44","slug":"kopp-etchells-effect","status":"publish","type":"post","link":"https:\/\/huewhite.com\/umb\/2016\/10\/21\/kopp-etchells-effect\/","title":{"rendered":"Kopp-Etchells Effect"},"content":{"rendered":"

A friend sent me pictures of the Kopp-Etchells Effect<\/strong><\/em>. From Wikipedia<\/strong><\/em><\/a>:<\/p>\n

\"k-e-1\"<\/a>Abrasion strips on helicopter rotor blades are made of metal, often titanium<\/a> or nickel<\/a>, which are very hard, but less hard than sand. When a helicopter flies low to the ground in desert environments, sand striking the rotor blade can cause erosion. At night, sand hitting the metal abrasion strip causes a visible corona or halo around the rotor blades. The effect is caused by the pyrophoric<\/a> oxidation of eroded particles and is known as the Kopp-Etchells Effect.<\/p>\n

The combat photographer and journalist Michael Yon<\/a> observed the effect while accompanying U.S. soldiers in Afghanistan. When he discovered the effect had no name he coined the name “Kopp-Etchells Effect” after two soldiers who had died in the war, one American and one British.<\/p>\n

\n<\/blockquote>\n

\"k-e-2\"<\/a>The pictures are uncredited, so I will just send a thank you out in the ether for sharing these beautiful pictures of events in an awful time.<\/p>\n

\n

One final picture.<\/p>\n

\"k-e-3\"<\/a><\/p>\n

(h\/t Jeff Norman)<\/p>\n","protected":false},"excerpt":{"rendered":"

A friend sent me pictures of the Kopp-Etchells Effect. From Wikipedia: Abrasion strips on helicopter rotor blades are made of metal, often titanium or nickel, which are very hard, but less hard than sand. When a helicopter flies low to the ground in desert environments, sand striking the rotor blade \u2026 Continue reading → <\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6046","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/posts\/6046","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/comments?post=6046"}],"version-history":[{"count":2,"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/posts\/6046\/revisions"}],"predecessor-version":[{"id":6051,"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/posts\/6046\/revisions\/6051"}],"wp:attachment":[{"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/media?parent=6046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/categories?post=6046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huewhite.com\/umb\/wp-json\/wp\/v2\/tags?post=6046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}