tag:blogger.com,1999:blog-1429839185579135541.post6721736282594312573..comments2007-08-12T20:35:48.023-07:00Comments on Cirrus - Transpac 2007: More on VMGBill Myershttp://www.blogger.com/profile/05131095213557393194noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-1429839185579135541.post-56479150605807945132007-07-15T15:36:00.000-07:002007-07-15T15:36:00.000-07:00You betcha. Got it!You betcha. Got it!Valeriehttps://www.blogger.com/profile/08670733111494747133noreply@blogger.comtag:blogger.com,1999:blog-1429839185579135541.post-33681498847443250472007-07-15T14:42:00.000-07:002007-07-15T14:42:00.000-07:00What is so damn difficult about VMG? It is simply ...What is so damn difficult about VMG? It is simply the speed over ground multiplied with the cosine of the angle between direct direction and direction actually taken. <BR/>Huh? What's cosine? Never use cosine for shopping at Costco? Ok, let's do a simpler example. <BR/><BR/>Imagine you are at Kailua Beach and want to go to Waikiki Beach. No idea, why you would ever want to do that, but for the sake of argument, let's assume you want. <BR/><BR/>Direct connection via the Pali Highway is 10 miles, and you manage that in 10 minutes (German driving style). Your SOG (Speed over ground) is the same as VMG (Velocity made good), namely 1 mile/minute. Now imagine Pali is blocked by an accident, and Likelike scrambled by an earthquake. You would have to go via Hanauma Bay. That is 10 miles to Hanauma Bay, and from there 10 miles to Waikiki (I simplify). Still assuming a really mad driver making 1 mile/minute even on the coastal road, it takes you 10 minutes to get to Hanauma, and another 10min to get to Waikiki. Your SOG is now still 1 mile/min, but your VMG is only 0.5 mile/min, because it take you twice as long.<BR/>OK?<BR/>UlliAnonymousnoreply@blogger.com