by WHL » Thu Mar 11, 2010 10:40 pm
Omar,
Thanks for all the great work you do with VR Tool. It makes the Virtual Game much more interesting than the boring, and frankly awkward user interface they have for setting headings, seeing where you headings intersect with land etc...
Question: I am running XP-Pro, VRTool Ver 1.8, standard polars for both Standard and Pro sails, and generally have had no problems. Recently I have noticed that the routing is giving me suggested upwind routes with TWA's that are way too tight e.g. the best VMG for an upwind destination is 36 degrees TWA at a certain TWS. The routing has given me 25 degrees for the TWA. (Note: the correct polars have been used and set before running the WR). Shouldn't it give me a route with tacks at the best VMG and not a single tack at sub-optimal TWA's?
Is there something I'm not doing in the WR config to resolve this? Note: I have been using the defaults.
As an aside, I have noticed when using the ruler tool, that VRTool is giving me higher boats speeds than the game is. I have not seen such differences on earlier legs of the race. I am using the same polars as the last leg. Do you know if the Virtual game site has changed their polars, or have changed their interpolation for a given TWA and TWS? Since I have not changed anything in VRTool's config since the last leg, I naturally suspect the difference is a result of something at the Virtual game site.
Many thanks
WHL