Hi Tibor, I'm flying the WGC at Uvalde and the yanks like to set large time AAT's or at least they did at the pre-worlds.
Didn't previous versions of XCS have the option to set cruise efficiency above 100%? Cheers David -----Original Message----- From: Tibor Arpas [mailto:ti...@bidforfix.com] Sent: Friday, July 13, 2012 2:04 AM To: Jacques Graells Cc: David Jansen; xcsoar-user@lists.sourceforge.net Subject: Re: [Xcsoar-user] Task Calculator 5h/730 km AAT ? I thought AAT is only used for shorter tasks in unpredictable weather. I would be curious to read about the context. What kind of competition, which country? Last turnpoint 200km out?! My questions maybe explain why not many people have your problems. As for you actual problem and its solution, I wouldn't like to get another settings which few people understand (expected effeciency). Instead maybe let XCsoar draw not only one optimized point, but a couple of lines, one after each other designating where you have to fly if you expect to be 5, 10, 15% better. But that's far from a finished suggestion. In general I have a feeling it would be possible to design a gliding computer which plays the "what-if game" for me, withouth fiddling with input values. (e.g. all arrival heights for 1m/s and 3m/s MC at the same time) Tibor On Thu, Jul 12, 2012 at 1:46 PM, Jacques Graells <jacques....@gmail.com> wrote: > I have the same issue and did previously ask the question but it seems > other pilots found the time estimate to be accurate. > > During the flight while NOT on final leg the problem is kind of > invisible, the MC is on auto or manual and as I get closer to target > XCsoar re-calculates and if necessary moves the TP further into the sector. > Then when on final leg if I make my turn trusting XCSoar to guide me > to the final TP at time +5 min I invariably arrive early. > > I suspect one of the reason is due because the time calculations do > not account for cruise efficiency. > I also found that having very conservative settings in XCsoar also > made me arrive early eg: finish height at 2000ft and actual arrival at > 500ft or excessive polar degradation factor, answer to fix on how to > fix this is obvious. > > The way I address the issue is that I know I need to add some time so > I go further into the last circle than what XCsoar tells me. > > One better way it could be addressed is if XCsoar could learn on the > cruise efficiency of the flight before the last leg or if there was a > parameter that we could set, say cruise efficiency +15% and the > calculations account for it. > > > Cheers > > Jax > > > > > -----Original Message----- > From: David Jansen [mailto:dgjanse...@gmail.com] > Sent: Thursday, 12 July 2012 8:07 PM > To: xcsoar-user@lists.sourceforge.net > Subject: [Xcsoar-user] Task Calculator > > Hi, > > I need some help with the Task Calculator in AAT. First here are some > stats from my last few flights: > > MC 4.2 Speed 125 > MC 5 Speed 137 > MC 4.9 Speed 144 > MC 5.9 Speed 146 > > > The problem is if I use a MC of say 6kts in the calculator it says I > will achieve a speed of around 120kph and optimise the AAT to this speed. > > As my actual speeds are some 25kph faster one option is to increase > the optimisation time to say 20 minutes to get a realistic task > distance. Even so, with a last turn 150-200km from the finish I can still > arrive early. > > Another option appears to be set MC to say 8-9kts then remove the task > optimisation option. Obviously the arrival delta time blows out to > something like 45 minutes but reduces throughout the flight as the finish > approaches. > > Neither choice is very satisfactory and there is no option to increase > cruise efficiency above 100% or to set a speed that might be achieved. > > I'd be interested in any other thoughts on how realistic task planning > can be managed? > > Thanks for your help. > > David > > Message reformatted to plain text. > > > > > > ---------------------------------------------------------------------- > ------ > -- > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Xcsoar-user mailing list > Xcsoar-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcsoar-user > > > ---------------------------------------------------------------------- > -------- > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Xcsoar-user mailing list > Xcsoar-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcsoar-user ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. 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