tag:blogger.com,1999:blog-19131460.post114407827017158402..comments2023-11-02T06:54:18.997-04:00Comments on Litoralis: Wind ShadowsLitoralishttp://www.blogger.com/profile/12417853893517755574noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-19131460.post-1144168274136877362006-04-04T12:31:00.000-04:002006-04-04T12:31:00.000-04:00The wind indicator method suggested by Dellenbaugh...The wind indicator method suggested by Dellenbaugh is a good simplificataion for downwind sailing in slowish boats.Litoralishttps://www.blogger.com/profile/12417853893517755574noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144109075643015572006-04-03T20:04:00.000-04:002006-04-03T20:04:00.000-04:00That's a big wind shadow sucking the air of that l...That's a big wind shadow sucking the air of that little boat. Great pic.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144107536688133922006-04-03T19:38:00.000-04:002006-04-03T19:38:00.000-04:00Good points. So is Dellenbaugh talking out of his ...Good points. So is Dellenbaugh talking out of his yahoo in saying that the wind indicator gives you a "very accurate idea of which way the boat's wind shadow extends"?Tillermanhttps://www.blogger.com/profile/00639738519386820997noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144103589687925942006-04-03T18:33:00.000-04:002006-04-03T18:33:00.000-04:00Straight downwind. The wind shadow is not shifted...Straight downwind. The wind shadow is not shifted by the movement of the boat in my mental model. <BR/><BR/>If you imagine a fast boat like a catamaran sailing on a broad reach (with respect to the true wind direction) but with the sails trimmed in to his apparent wind direction. The wind shadow of the catamaran must still extend downwind. If it extends along the apparent wind angle then it would extend upwind. There will be a region of turbulent air following the path of the boat, but this is turbulence, not a wind shadow. <BR/><BR/>Also, imagine a large powerboat moving quickly in a direction perpendicular to the true wind direction. It will still have a wind shadow extending downwind from its beam even though the apparent wind angle on the boat is the same as its direction of travel.Litoralishttps://www.blogger.com/profile/12417853893517755574noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144102272370779542006-04-03T18:11:00.000-04:002006-04-03T18:11:00.000-04:00Straight down true or straight down apparent wind?...Straight down true or straight down apparent wind?Tillermanhttps://www.blogger.com/profile/00639738519386820997noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144100856075842632006-04-03T17:47:00.000-04:002006-04-03T17:47:00.000-04:00I think it is straight downwind. I visualize wind...I think it is straight downwind. I visualize wind shadows as holes in the wind that extend downwind from the sail plan of the boat.Litoralishttps://www.blogger.com/profile/12417853893517755574noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144099065097046432006-04-03T17:17:00.000-04:002006-04-03T17:17:00.000-04:00But is it a line straight down the true wind direc...But is it a line straight down the true wind direction or straight down the apparent wind direction of the windward boat?Tillermanhttps://www.blogger.com/profile/00639738519386820997noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144098660421124322006-04-03T17:11:00.000-04:002006-04-03T17:11:00.000-04:00Wind indicators point to windward, but they are af...Wind indicators point to windward, but they are affected by apparent wind, so a more accurate description would be that you are potentially in someone's wind shadow when you are on the imaginary line drawn straight downwind from the windward boat's sail plan.Litoralishttps://www.blogger.com/profile/12417853893517755574noreply@blogger.comtag:blogger.com,1999:blog-19131460.post-1144096236356224962006-04-03T16:30:00.000-04:002006-04-03T16:30:00.000-04:00So are you in another boat's wind shadow when its ...So are you in another boat's wind shadow when its wind indicator is pointing at you, or when your wind indicator is pointing at them?Tillermanhttps://www.blogger.com/profile/00639738519386820997noreply@blogger.com