lien<\/a>.)<\/p>\n<\/p>\n\tSweetman signale certains d\u00e9tails jusqu’ici in\u00e9dits d’un rapport de l’U.S. Navy de janvier dernier, qui analyse les \u00e9normes probl\u00e8mes pos\u00e9s par le JSF dans sa version du Marine Corps \u00e0 atterrissage vertical (le F-35B). Cette version est faite pour intervenir sur des pistes ou des surfaces rudimentaires, am\u00e9nag\u00e9es pr\u00e8s des th\u00e9\u00e2tres d’op\u00e9ration. Mais la pouss\u00e9e et la chaleur d\u00e9gag\u00e9es vers le sol par l’avion en train d’atterrir sont telles qu’elles d\u00e9truiront les surface planes, feront fondre l’asphalte, feront \u00e9clater les pav\u00e9s, creuseront des crat\u00e8res, etc! En gros, il faudrait plut\u00f4t songer \u00e0 am\u00e9nager des pistes classiques pour permettre \u00e0 l’avion \u00e0 atterrissage vertical de ne pas atterrir verticalement.<\/p>\n<\/p>\n
\t\u00abThe Marines say that the the AV-8B’s replacement, the F-35B Joint Strike Fighter, will be able to do the same: The flexibility that the STOVL variant of the F-35 will add to the contemporary Marine Air Ground Task Force is amazing, Marine commandant Gen James Conway said when the first F-35B was rolled out, more than two years ago. This generational leap in technology will enable us to operate a fleet of fighter\/attack aircraft from the decks of ships, existing runways or from unimproved surfaces at austere bases.<\/em><\/p>\n<\/p>\n\t\u00bbBut a Navy report issued in January says that the F-35B, in fact, won’t be able to use such forward bases. Indeed, unless it ditches its short take-off, vertical landing capability and touches down like a conventional fighter, it won’t be able to use land bases at all without some major construction efforts.<\/em> <\/p>\n<\/p>\n\t\u00bbThe newly released document, hosted on a government building-design resource site, outlines what base-construction engineers need to do to ensure that the F-35B’s exhaust does not turn the surface it lands on into an area-denial weapon. And it’s not trivial. Vertical-landing pads will be exposed to 1700 deg. F and high velocity (Mach 1) exhaust, the report says. The exhaust will melt asphalt and is likely to spall the surface of standard airfield concrete pavements on the first VL. (The report leaves to the imagination what jagged chunks of spalled concrete will do in a supersonic blast field.)<\/em><\/p>\n<\/p>\n\t\u00bbNot only does the VL pad have to be made of heat-resistant concrete, but currently known sealants can’t stand the heat either, so the pad has to be one continuous piece of concrete, with continuous reinforcement in all directions so that cracks and joints remain closed. The reinforced pad has to be 100 feet by 100 feet, with a 50-foot paved area around it.<\/em> <\/p>\n<\/p>\n\t\u00bbBy the way, any area where an F-35B may be stopped with the engine running runway ends, hold-shorts on taxiways, and ramps also has to be made of heat-resistant concrete to tolerate the exhaust from the Integrated Power Pack (IPP), which is acting as a small gas turbine whenever the aircraft is stopped<\/em>\u00bb<\/p>\n<\/p>\n\n
Chandernagor<\/em><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"L\u00e0 o\u00f9 le JSF se pose, l’herbe ne repousse plus Encore une amusante p\u00e9rip\u00e9tie pour le JSF. Une fois de plus, elle vient de Bill Sweetman, sur son blog Ares, le 11 mars 2010. (Voir le lien.) Sweetman signale certains d\u00e9tails jusqu’ici in\u00e9dits d’un rapport de l’U.S. Navy de janvier dernier, qui analyse les \u00e9normes… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[14],"tags":[9172,4136,5128,250,3572,6769],"class_list":["post-71654","post","type-post","status-publish","format-standard","hentry","category-ouverture-libre","tag-chandernagor","tag-corps","tag-f-35b","tag-jsf","tag-marine","tag-sweetman"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/posts\/71654","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/comments?post=71654"}],"version-history":[{"count":0,"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/posts\/71654\/revisions"}],"wp:attachment":[{"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/media?parent=71654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/categories?post=71654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/new.dedefensa.org\/index.php\/wp-json\/wp\/v2\/tags?post=71654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}