{"id":184489,"date":"2012-04-14T20:57:00","date_gmt":"2012-04-15T01:57:00","guid":{"rendered":"https:\/\/www.panix.com\/~msaroff\/40years\/2012\/04\/14\/im-not-sure-if-these-are-winglets-or-stators\/"},"modified":"2012-04-14T20:57:00","modified_gmt":"2012-04-15T01:57:00","slug":"im-not-sure-if-these-are-winglets-or-stators","status":"publish","type":"post","link":"https:\/\/www.panix.com\/~msaroff\/40years\/2012\/04\/14\/im-not-sure-if-these-are-winglets-or-stators\/","title":{"rendered":"I’m Not Sure if These are Winglets or Stators"},"content":{"rendered":"
Click for full size<\/p>\n
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<\/a>
I Think that it’s more of a stator than a winglet<\/i><\/div>\n

Aviation Week<\/i> has an article about looking at winglets to increase the performance of the V-22 Osprey<\/a> (paid subscription required<\/i>):<\/p>\n

The ability of the Bell Boeing V-22 Osprey tiltrotor to fly farther, as well as faster, than helicopters has been a key factor in its fight for survival for more than a decade. But now, with both CV-22B and MV-22B versions recently pressed into service on longer-range, self-deployed combat and rescue missions in Libya and Afghanistan, the hunt is on for greater unrefueled performance.<\/p>\n

Squeezing more range out of the V-22 is not easy, however. Constrained from birth by the need to fit on the restricted decks of U.S. Navy amphibious assault ships, the tiltrotor was necessarily limited to smaller-than-optimal wing and rotor dimensions leading to an inevitable impact on range. Without the options of increasing wingspan or rotor diameter available to them, designers are taking a leaf out of the Boeing Commercial Airplanes playbook and studying nacelle-mounted \u201csails\u201d that work on the same principle as winglets.<\/p>\n

Although Bell Boeing declines to comment on the development, Naval Air Systems Command (Navair) confirms it is preparing to flight test a modified MV-22 with the upgrade which could boost range by almost 5%. The concept, which was studied by Boeing for the Special Operation Forces CV-22 version as far back as 1994, harnesses the energy from the vertical upwash around the wing and nacelle. In the case of the V-22, Bell Boeing\u2019s research indicates upwash angles of 10-20 deg. around the nacelles at the nominal cruise pitch attitude of 8 deg. The additional upwash velocity produces a propulsive force by tilting the lift vector forward.<\/p><\/blockquote>\n

I should note that I am not an aerodynamicist, but it looks to me a lot of the gains from these surfaces are from straightening the rotational wash off the props, much in the same way that stators do in a multi-stage turbine.<\/p>\n

Because it increases effective wing area, it would have the effect of reducing longitudinal stability, so the flight test regime will target this concern.<\/p>\n","protected":false},"excerpt":{"rendered":"

Click for full size I Think that it’s more of a stator than a winglet Aviation Week has an article about looking at winglets to increase the performance of the V-22 Osprey (paid subscription required): The ability of the Bell Boeing V-22 Osprey tiltrotor to fly farther, as well as faster, than helicopters has been …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1007,1226,1025],"tags":[],"class_list":["post-184489","post","type-post","status-publish","format-standard","hentry","category-aviation","category-helicopters","category-technology"],"_links":{"self":[{"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/posts\/184489"}],"collection":[{"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/comments?post=184489"}],"version-history":[{"count":0,"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/posts\/184489\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/media?parent=184489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/categories?post=184489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.panix.com\/~msaroff\/40years\/wp-json\/wp\/v2\/tags?post=184489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}