I’ve not blogged in over six months, other than the mermaids, who are on autopilot. This is for a variety of reasons, but for archival purposes I will try to get some of my racing stuff up, though this season has not been one of distinction.
In the face of perennial crew difficulties, Annika and I are pretty much planning on doing PacCup 2012 double-handed, in the ultimate daddy-daughter adventure. She will be up from school for the winter holidays, and we are going to take our First Aid course together and if we can get reasonable weather, an overnight offshore cruise.
Meanwhile, I have been amusing myself by writing my own routing program in Mathematica, since that is what I know, and it supports all sorts of graphics and data-juggling features, and even can directly import GRIB files. The pic above shows a test run to determine the leaders (outlined in red) of a fleet of isochronic boats. I am working on both the standard isochron method, and a stretchy-string idea which may be my own, or maybe not. It’s a pretty difficult problem either way. I’m using some polars I found for a Beneteau 36.7, and the program still chokes when you are sailing along through the non-stationary wind field and you go into irons for too long. I’m not sure how to sensibly insert short-tacking into the search method, other than by Monte Carlo’ing the heading and dealing with a vast number of branching possible routes. Fortunately, the SF to Kaneohe route I care about has no land to dodge around, so I can ignore collisions.