{"id":46,"date":"2009-05-02T11:10:06","date_gmt":"2009-05-02T19:10:06","guid":{"rendered":"http:\/\/projects.m-qp-m.us\/donkeypuss\/?p=46"},"modified":"2009-05-02T11:10:06","modified_gmt":"2009-05-02T19:10:06","slug":"dwfttw-update","status":"publish","type":"post","link":"https:\/\/projects.m-qp-m.us\/donkeypuss\/dwfttw-update_2009-05-02","title":{"rendered":"DWFTTW Update"},"content":{"rendered":"<p>Today I searched the &#8216;net to see how the discussions were going, and I came across <a href=\"http:\/\/www.boatdesign.net\/forums\/propulsion\/ddwfttw-directly-downwind-faster-than-wind-25527.html\" target=\"_blank\">this<\/a> forum. Included are some pretty desired documents. One is a pair of papers by Andrew Bauer, arguably the true originator of the concept. One paper describes what is essentially <a href=\"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-content\/uploads\/2009\/05\/bauer_tacking.pdf\" target=\"_blank\">a continuously tacking boat<\/a>; the other is <a href=\"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-content\/uploads\/2009\/05\/bauer_boat.pdf\" target=\"_blank\">a boat with a water propeller connected to an air propeller<\/a>, in which, depending on the direction of the boat relative to the wind, one drives the other or vice-versa.<\/p>\n<p>Also interesting is a pair of analyses by renowned MIT professor <a href=\"http:\/\/web.mit.edu\/aeroastro\/people\/drela.html\" target=\"_blank\">Mark Drela<\/a>. One is <a href=\"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-content\/uploads\/2009\/05\/drela_energy.pdf\" target=\"_blank\">a derivation of the energy balance<\/a>, applicable both to a cart or a boat, and the other, more complete analysis, is <a href=\"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-content\/uploads\/2009\/05\/drela_efficiency.pdf\" target=\"_blank\">one based on efficiencies<\/a>, the conclusion of which is that the cart should achieve speed faster than the wind relatively easily.<\/p>\n<p>Case closed?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today I searched the &#8216;net to see how the discussions were going, and I came across this forum. Included are some pretty desired documents. One is a pair of papers by Andrew Bauer, arguably the true originator of the concept. One paper describes what is essentially a continuously tacking boat; the other is a boat [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,6],"tags":[],"_links":{"self":[{"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/posts\/46"}],"collection":[{"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/comments?post=46"}],"version-history":[{"count":0,"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/posts\/46\/revisions"}],"wp:attachment":[{"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/media?parent=46"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/categories?post=46"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projects.m-qp-m.us\/donkeypuss\/wp-json\/wp\/v2\/tags?post=46"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}