This is the "I repeat myself over and over" thread! On 2011/11/22 20:51, David Reitter <david.reit...@gmail.com> wrote: > In my view, the problem at hand is that XCSoar seems to assume that > height is always gained by way of thermaling. That is obviously not > correct.
No, you are wrong. XCSoar only assumes that height is gained by way of thermaling if you tell XCSoar to do so. If you don't tell XCSoar to do so, XCSoar will not assume it. If you set a positive MacCready value, you tell XCSoar that you want to gain height by circling thermals. If you don't plan to do that, don't set a positive MacCready value, because the whole point/basis of the MacCready theory is the assumption of future lift. All other reasons to set a positive MacCready value are kludges that don't fit into the theory, but XCSoar might need additional features to account for some of that. For example, head wind is already being considered, and you don't need to adjust the MacCready setting for that. You may use the "bugs" setting to degrade your polar, but don't tweak MacCready for that. > XCSoar 6.x does not make assumptions about finding a thermal or other lift > source if MC>0, for purposes of reachability calculations, right? I would be > very confused if it did. Please clarify. Recall that reaching some > outlanding field is already "plan B", i.e., it's the plan in place for when > the thermals die. If the outlanding field is reachable, no lift is assumed, because no lift is needed. If the outlanding field is not reachable, and you have a positive MacCready setting, then XCSoar will need to assume that you will be thermaling to ever reach that field, and it will include the wind drift while thermaling in its calculations. If you don't want XCSoar to assume you'll ever be thermalling, don't set a positive MacCready value. (Have I repeated this statement often enough in this email?) Max ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ Xcsoar-user mailing list Xcsoar-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xcsoar-user
