Comparing some flights from a recent comp, A glider that flew direct saw 4 knot average climbs and averaged 40:1
A glider of the same type deviated a lot, saw 6 knot climbs and achieved 50:1 The glider that deviated could fly an additional 26km and still be ahead. That's a deviation of about 42 degrees ! Alternatively a 30 degree deviation has this glider 6 minutes ahead after 100km ! Matt On 17/03/2013, at 21:52 , John Orton <johno...@gmail.com> wrote: > John H Cochrane has some very good articles on the web he has done some > analysis on deviations which can be found at > http://faculty.chicagobooth.edu/john.cochrane/soaring/docs/deviations_I.pdf > > Othe good artciles can also be found on this page > http://faculty.chicagobooth.edu/john.cochrane/soaring/index.htm > > Regards, > John Orton > > > > On 17 March 2013 11:57, Bruce <discusdri...@gmail.com> wrote: > Adam, > > Is the wisp stable, building or decaying? No-one has identified that so far. > Building, go. Decaying, pass it by. You should know unless you have been at > cloud base - watch the sky ahead, not just cloud by cloud. > > I broadly agree with some previous comments, but also no-one has mentioned > whether it is upwind or downwind (assuming that the direct track has a > crosswind component). A mistake (no better air) made after diverting downwind > is a bigger mistake. > > Also no-one has mentioned whether there are other gliders already at the wisp > or headed that way - if there are, and they are clearly climbing, then go for > it. On some days the cycle may be short, so wisps are used often. Then again, > you can be surprised and use a wisp on a bigger day. > > You have asked a closed question (assuming that if it is more than 30degrees > it isn't worth diverting). Some of the previous points may justify greater > diversions if very short distances are involved, if upwind/other gliders > climbing strongly etc. > > There is no one simple rule of thumb - there are quite a few, and they have > greater or lesser importance on different days. That's why those who fly more > generally succeed! (So long as they aren't just repeating themselves). > > Cheers > > Bruce > > Sent from my iPad > > On 15/03/2013, at 5:42 PM, Adam Woolley <go_soar...@hotmail.com> wrote: > > > Everyone knows something that another doesn't know in soaring. Trying to > > figure out the below, any thoughts from the floor? > > > > > > > > The scenario: You've just left a CU, with the cloud direct on track being > > your target cloud between 3-5km away with an average climb expected, direct > > is blue and normal sink. 30* to your left/right is a whisp, not one that > > you'd use to climb in - but one that you could deviate too in order to get > > reduced sink or a hundred feet of altitude. > > > > Do you, go direct through the sinking air, or cover extra track miles to > > the whisp that you know you're not going to climb in, but get remarkably > > reduced sink (or even a small gain in height)? > > > > For me, I either always just lose out (more often than not) when getting to > > the next CU, or gain a massive advantage with a 1000' height gain on a > > competitor in that short cruise. > > > > Have you got any rough 'rules of thumb' that you use in order to decide if > > the short term deviation is worth it or not? > > > > ie, how can I get to the next CU by beating the other competitors by second > > a mile (as G.Moffat would say) if it's possible overall. > > > > > > Cheers, > > Woolley > > _______________________________________________ > > Aus-soaring mailing list > > Aus-soaring@lists.internode.on.net > > To check or change subscription details, visit: > > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring
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