I don't race (much anyway), so I just gybe when something gets in the way (like a tug towing a barge usually), or it looks like I'll need to in order to make the next destination.
I think what they are saying is you maximize your VMG under chute for the conditions, and once you know the TWA for those conditions, you can then calculate (or the plotter will show you) the reciprocal layline after a gybe. -- Shawn Wright shawngwri...@gmail.com S/V Callisto, 1974 C&C 35 https://www.facebook.com/SVCallisto On Wed, Oct 6, 2021 at 9:25 AM Bob Mann <sailrm...@comcast.net> wrote: > I don't understand how either answer is telling me it's time to gybe. > > Bob > > On 10/06/2021 11:37 AM Shawn Wright via CnC-List <cnc-list@cnc-list.com> > wrote: > > > I don't race, but do use VMG when trying to get our best time to > destination, especially on longer days. This works well enough in many long > channels and inlets with wind aligned with our course, but sometimes it's > not aligned. In these instances I'll have to try this trick for fooling the > VMG by giving it a waypoint at the far end of whatever channel we're > navigating. Of course, I'll have to read the B&G manual, as their UI is not > that intuitive, or things don't always work as you expect. > > -- > Shawn Wright > shawngwri...@gmail.com > S/V Callisto, 1974 C&C 35 > https://www.facebook.com/SVCallisto > > On Wed, Oct 6, 2021 at 8:30 AM Dennis C. via CnC-List < > cnc-list@cnc-list.com> wrote: > > Bob, > > First, let's define some terms. > > VMG (wind based) - the component of your velocity DIRECTLY upwind or > downwind. > > WCV - waypoint closure velocity. The component of your velocity headed > directly at your mark (assuming it's set in your GPS). This is often shown > on most GPS systems as VMG. > > Now, if you don't have an instrument system that calculates VMG, don't use > GPS VMG (WCV). The problem is that, as you approach the layline, WCV will > tend to zero. If you overstand and cross the layline, WCV will become > negative. While this is good information for when to tack or gybe, it's > usually too late. > > Here's how to fake your GPS into giving you VMG (wind based). Set a > waypoint well past the windward mark. Let's assume the race committee sets > a good W/L course with the windward mark directly upwind of the start. > Let's say the wind is from 000 and the windward mark is set at 000 for a 2 > mile leg. Enter a waypoint in your GPS at 000 20 miles out. By setting > the waypoint so far out, WCV will approximate VMG. > -- > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > On Wed, Oct 6, 2021 at 10:03 AM Bob Mann via CnC-List < > cnc-list@cnc-list.com> wrote: > > I'm fairly new to flying a spinnaker. I did it last weekend in a race and > I believe I overstood the mark as we were sailing 110 AW before the gybe > and 85 AW heading directly to the mark. > > How does one determine when to gybe? > > Bob > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu > > > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - > Stu > >
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
